# Make It Talk ## Overview https://youtu.be/bm-jBX-C_Ls For many years, microcontrollers were limited to blink an LED or make beeping noises to get your attention. Today our projects can do more than the basics. Modern electronics can play songs and make complex sounds including human speech. The capability to speak is a game changer in building modern projects. This guide will help you quickly generate the sound files to have your microcontroller the center of your voice capable project. ## Parts For this tutorial, we'll mainly be using the Express line of CircuitPython programmable boards from Adafruit. The ability to use CircuitPython provides many advances in implementing complex programs with just a few lines of code. Featured ### Circuit Playground Express [Circuit Playground Express](https://www.adafruit.com/product/3333) **Circuit Playground Express** is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and made it even better! Not only did we pack even more sensors in, we also made it even easier to... In Stock [Buy Now](https://www.adafruit.com/product/3333) [Related Guides to the Product](https://learn.adafruit.com/products/3333/guides) ![A Black woman's manicured hand holds a round microcontroller with lit up LEDs.](https://cdn-shop.adafruit.com/640x480/3333-05.jpg) Featured ### Adafruit METRO M0 Express - designed for CircuitPython [Adafruit METRO M0 Express - designed for CircuitPython](https://www.adafruit.com/product/3505) Metro is our series of microcontroller boards for use with the Arduino IDE. This new **Metro M0 Express** board looks a whole lot like our [original Metro 328](https://www.adafruit.com/product/2488), but with a huge upgrade. Instead of the ATmega328, this Metro... In Stock [Buy Now](https://www.adafruit.com/product/3505) [Related Guides to the Product](https://learn.adafruit.com/products/3505/guides) ![Angled shot of a Adafruit METRO M0 Express - designed for CircuitPython.](https://cdn-shop.adafruit.com/640x480/3505-10.jpg) Featured ### Adafruit Metro M4 feat. Microchip ATSAMD51 [Adafruit Metro M4 feat. Microchip ATSAMD51](https://www.adafruit.com/product/3382) Are you ready? Really ready? Cause here comes the fastest, most powerful Metro ever. The **Adafruit Metro M4** featuring the **Microchip ATSAMD51**. This Metro is like a bullet train, with its 120MHz Cortex M4 with floating point support. Your code will zig and zag... In Stock [Buy Now](https://www.adafruit.com/product/3382) [Related Guides to the Product](https://learn.adafruit.com/products/3382/guides) ![Angled shot of a Adafruit Metro M4 feat. Microchip ATSAMD51. ](https://cdn-shop.adafruit.com/640x480/3382-13.jpg) Featured ### Adafruit Feather M4 Express - Featuring ATSAMD51 [Adafruit Feather M4 Express - Featuring ATSAMD51](https://www.adafruit.com/product/3857) It's what you've been waiting for, the Feather M4 Express featuring ATSAMD51. This Feather is fast like a swift, smart like an owl, strong like a ox-bird (it's half ox, half bird, OK?) This feather is powered by our new favorite chip, the **ATSAMD51J19** -  with... In Stock [Buy Now](https://www.adafruit.com/product/3857) [Related Guides to the Product](https://learn.adafruit.com/products/3857/guides) ![Angled shot of a Adafruit Feather M4 Express. ](https://cdn-shop.adafruit.com/640x480/3857-10.jpg) Featured ### USB Powered Speakers [USB Powered Speakers](https://www.adafruit.com/product/1363) Add some extra boom to your audio project with these powered loudspeakers. We sampled half a dozen different models to find ones with a good frequency response, so you'll get quality audio output for music playback. Simply connect the standard 3.5mm stereo plug into your Raspberry Pi model... In Stock [Buy Now](https://www.adafruit.com/product/1363) [Related Guides to the Product](https://learn.adafruit.com/products/1363/guides) ![Two square-ish USB Powered Speakers](https://cdn-shop.adafruit.com/640x480/1363-07.jpg) # Make It Talk ## Generating Voice Sound Clips ![](https://cdn-learn.adafruit.com/assets/assets/000/066/286/medium800/microcontrollers_audacity.jpg?1542739725) Every project is different and every source for material is different, so to obtain voice clips and for them to be in the correct format will likely take some work. It isn't very hard, but it may take a bit of time depending on the source material and the number of word files you want to play. # First Try - Do Recordings Exist for Your Dialog? Before generating custom dialog, does dialog exist somewhere already recorded? Probably not for specific texts but for simple words and phrases, yes there are websites that offer pre-recorded sounds. The sites may not always be on the Internet and it is likely the files need conversion to microcontroller-friendly format but it will save you time. Here are sources for pre-recorded dialog that we have found and the licensing terms: - [Aspect](https://evolution.voxeo.com/library/audio/prompts/) - Pre-Recorded Audio: A wide variety of spoken words and phrases in American male english. Numbers, alphabet, much more. [LGPL license](https://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License). - [https://freesound.org/](https://freesound.org/) has a large number of license free sounds. - An Internet search may find additional resources for pre-recorded sounds. - If you are looking to read numbers, this tutorial has pre-recorded numbers for you. [See this page for more details](https://learn.adafruit.com/make-it-talk/numbers). # Custom Voice Files ## Method 1: Record Your Own Voice A number of programs allow you to record your voice on your PC/Mac/Linux machine. - For Mac, it is suggested you use QuickTime Player: Select  **File**  then  **New Audio Recording** - For Windows 10, search for the Voice Recorder app. ![microcontrollers_screen_shot_2018-12-13_at_12.47.32_pm.png](https://cdn-learn.adafruit.com/assets/assets/000/067/569/medium640/microcontrollers_screen_shot_2018-12-13_at_12.47.32_pm.png?1544734889) ![microcontrollers_voicerecorder.png](https://cdn-learn.adafruit.com/assets/assets/000/067/571/medium640/microcontrollers_voicerecorder.png?1544734944) For all platforms: you may download and record audio with the free [Audacity program](https://www.audacityteam.org/). You will want a "script" your phrases: write down the words you will want to play in your project. Then you or your voice person will speak each of the phrases one at a time with some space between words (or record each word as its own sound file which may save some edit time).  You can also record sound effects, holiday sounds, etc. this way. ## Method 2: Using Machine Generated Voice (text-to-speech) While computers can generate voices, it can get convoluted, so we'll use the power of the web to use some websites to generate text to speech. Different services support different speakers (male/female) and languages. Note that Adafruit does not endorse any 3rd party site, sometimes they restrict use or the site disappears, in such a case, go to another or use a search engine to find "Free text to speech mp3". ### IBM BlueMix Text to Speech The IBM speech engine is accessible at [this web site](https://text-to-speech-demo.ng.bluemix.net/). You can type in words, phrases, sentences and more and save the result as an MP3 file. Different speakers and different languages are supported. **See the example of how to use this on the next page.** ### NaturalReaders [This web site](https://www.naturalreaders.com/online/) says it allows for 20 minutes of free speech conversion to MP3.  ### fromtexttospeech.com Another Text to Speech engine [available here](http://www.fromtexttospeech.com/), works well, check out male voice John. ### Text 2 speech .org [A basic site](https://www.text2speech.org/) that has US and Indian voices and you can download in WAV and MP3. ### Amazon Polly [This service](https://aws.amazon.com/polly/) charges a very small fee per character but you can use the recorded audio anyway you want.  # Make It Talk ## Example: Making WAV Files with Text to Speech Here is a step by step method for making your own words and sentences via the IBM text to speech web site. ## Obtaining MP3 Files from the BlueMix Text to Speech Engine The IBM speech capability is called BlueMix. You can navigate to the site via a modern web browser to [https://text-to-speech-demo.ng.bluemix.net/](https://text-to-speech-demo.ng.bluemix.net/).  Select the voice you would like to use.   For examples later in this tutorial, I chose Allison which is a female American English voice. While there are thirteen voices in ten variants, you do not have the choice of male and female in all languages. If you would like a different voice than those listed, you should look at other text to voice services. ![microcontrollers_Bluemix-input.png](https://cdn-learn.adafruit.com/assets/assets/000/067/598/medium640/microcontrollers_Bluemix-input.png?1544798519) Type the word/phrase/sentence/text you would like converted to speech in the input box.   You can press **\>** to play the clip in the browser or the **Speak** button to do the same.   When you are happy with the results, click **Download** to save the file on your computer. The file will be in MP3 format which is fine. ![microcontrollers_bluemix-input.jpg](https://cdn-learn.adafruit.com/assets/assets/000/067/599/medium640/microcontrollers_bluemix-input.jpg?1544798695) If the application is not reading your text the way you want, consider alternative spellings of words, even if the spelling looks silly since we're only looking for a good sounding clip. You can use SSML to change the American English voices. Speech Synthesis Markup Language  adds tags to tell a speech engine how you want text read. IBM has documentation [here](https://console.bluemix.net/docs/services/text-to-speech/SSML.html) and tags [here](https://console.bluemix.net/docs/services/text-to-speech/SSML-transformation.html#transformation) if you need this capability. Make all the MP3 clips for your entire project and put them in locations which are easily found for the next step. ## Converting BlueMix MP3 Files to WAV Files The conversion is easily done using the open source program **Audacity** which is available for all operating systems. If you do not already have the program installed, you can **download** it [from the official site](https://www.audacityteam.org/download/) and install it. Open Audacity and you'll see the main page.   Use **File** -\> **Open** and navigate to the voice MP3 file for your first conversion. Here I have opened a file **0.mp3** which contains a recording saying "zero".   You'll notice the BlueMix site generates monotone (one channel) audio at 22,050 Hz 16-bit PWM which is (usually) exactly what we want without fiddling with any changes.   Use **File** -\> **Export** -\> **Export as WAV** to convert the file to a WAV file.   Audacity opens a **Save File** dialog. Save the WAV file where you'll remember it on your hard drive.   Repeat the same process for all your MP3 files and you'll have a collection of WAV files suitable for use on microcontroller projects. ![microcontrollers_audacity_main.jpg](https://cdn-learn.adafruit.com/assets/assets/000/067/600/medium640/microcontrollers_audacity_main.jpg?1544799452) ![microcontrollers_audacity_file.jpg](https://cdn-learn.adafruit.com/assets/assets/000/067/601/medium640/microcontrollers_audacity_file.jpg?1544799477) ![microcontrollers_audacity_convert.png](https://cdn-learn.adafruit.com/assets/assets/000/067/602/medium640/microcontrollers_audacity_convert.png?1544799646) ![microcontrollers_audacity_save.jpg](https://cdn-learn.adafruit.com/assets/assets/000/067/603/medium640/microcontrollers_audacity_save.jpg?1544799950) You will want to write your code such that your WAV files are easy to use. Adafruit tutorials put limited numbers of WAV files in the main (root) directory on the project CIRCUITPY drive. For more than a few files, it is suggested that you make a subdirectory to put the files into. For the number voice WAV files used in this guide, a subdirectory called **/numbers** was created to hold the files. ## If Space is Limited... All the files above were created by BlueMix to be 22,050 Hz. If you have WAV files that take up a great amount of space, your space on the board **CIRCUITPY** flash drive might fill up. If you need additional space, you might consider creating files at a lower sampling rate (lower than 22,050 Hz). Perhaps use 11,025 Hz or maybe down to 8000 Hz. The fidelity of the voice will suffer as you reduce the sample rate. Before **Exporting** the file to WAV, you will want to **Resample** the file. In Audacity, use **Tracks** -\> **Resample**. Type in the new rate. Then you can **Export** as described above.  ![](https://cdn-learn.adafruit.com/assets/assets/000/067/657/medium800/microcontrollers_audacity_resample.png?1544812651) This will result in smaller files with a reduction in sound quality. It is not suggested to go lower than 8,000 Hz as that will reproduce voice to 4,000 Hz which will not reproduce the high notes in voice. # Make It Talk ## Converting Sound Files for Use ![](https://cdn-learn.adafruit.com/assets/assets/000/066/287/medium800/microcontrollers_convert.jpg?1542740219) The sound files you have recorded probably need some work. Our microcontroller really works best if we provide it sound files in a standard format that it understands easily, so that it can do other things at the same time in projects. For our target language, CircuitPython, the format we can use is the WAV (wave) file format. WAV files can come in a variety of types (way too many) so we will be specific to what we want: - 16-Bit Pulse Control Modulation (PCM) - Sampling speed no greater than 22,050 Hz  If you have a microcontroller that can process stereo (left/right) sound like the [NeoTrellis M4](https://www.adafruit.com/product/4020), you can make your files stereo. For other microcontrollers, Adafruit specifies using mono (single channel) only. ## Converting Your Clips Adafruit has a separate guide on using software to convert sound files to the correct WAV format: - [Microcontroller Compatible Audio File Conversion](https://learn.adafruit.com/microcontroller-compatible-audio-file-conversion) Programs like Audacity, used in that guide, can trim files to eliminate all but the desired recording. They can also trim one big file like a script into individual recordings. Convert your files, ensuring the exact parameters noted above and in the conversion guide. Save the files on your computer with a .wav extension on the filename, such as 1.wav, hello.wav, spooky.wav, one.wav, two.wav, etc. Next we'll code some CircuitPython to use those sound files. # Make It Talk ## CircuitPython ![](https://cdn-learn.adafruit.com/assets/assets/000/067/380/medium800/microcontrollers_blinka-Music.jpg?1544455006) Currently CircuitPython is best for opening and using sound files. MakeCode does not handle files and Arduino is a steep mountain full of deep chasms.  Are you new to using CircuitPython? No worries, [there is a full getting started guide here](https://learn.adafruit.com/welcome-to-circuitpython). Adafruit suggests using the Mu editor to edit your code and have an interactive REPL in CircuitPython. [You can learn about Mu and its installation in this tutorial](https://learn.adafruit.com/welcome-to-circuitpython/installing-mu-editor). ## Simple Sound Triggering For this example we will use a Circuit Playground Express board as it has two buttons onboard.  The code waits for either **Button A** or **Button B** to be pressed and plays one of two wav files, **01.wav** or **02.wav**. The sound will come out on the speaker on the Circuit Playground Express board. If you'd like to hook up headphones or powered speakers, make the following connections: ![](https://cdn-learn.adafruit.com/assets/assets/000/067/381/medium800/microcontrollers_circuitpython_circuit_playground_hp.png?1544456886) ```auto from adafruit_circuitplayground.express import cpx while True: if cpx.button_a: cpx.play_file("01.wav") if cpx.button_b: cpx.play_file("02.wav") ``` Copy this file to the **CIRCUITPY** drive as **code.py**. Download these two wav files below and place them on the **CIRCUITPY** drive in the main (root) directory. [01.wav](https://cdn-learn.adafruit.com/assets/assets/000/067/572/original/01.wav?1544735435) [02.wav](https://cdn-learn.adafruit.com/assets/assets/000/067/573/original/02.wav?1544735441) Here is what it sounds like with two demonstration voice files: https://youtu.be/rdVqIGPkGkQ For other Express boards besides the Circuit Playground Express, here is a more generalized code script. This is shown using the Metro M0 Express although the code still runs on the Circuit Playground Express by uncommenting two lines for pin definitions. Use the save WAV files above for testing. The analog output **A0** goes to the jack of [headphones](https://www.adafruit.com/product/1966) or [amplified speakers](https://www.adafruit.com/product/1363). ![](https://cdn-learn.adafruit.com/assets/assets/000/067/658/medium800/microcontrollers_metro-buttons_plug.png?1544813316) ```python # Generalized CircuitPython audio play file import time import board import audioio import audiocore from digitalio import DigitalInOut, Direction, Pull # D1 = board.BUTTON_A # uncomment these if using # D2 = board.BUTTON_B # a Circuit Playground Express # Button A button_a = DigitalInOut(D1) button_a.direction = Direction.INPUT button_a.pull = Pull.DOWN # Button B button_b = DigitalInOut(D2) button_b.direction = Direction.INPUT button_b.pull = Pull.DOWN # Audio playback object and helper to play a full file aout = audioio.AudioOut(board.A0) # Play a wave file def play_file(wavfile): print("Playing", wavfile) with open(wavfile, "rb") as f: wav = audiocore.WaveFile(f) aout.play(wav) while aout.playing: pass while True: if button_a.value: play_file("01.wav") if button_b.value: play_file("02.wav") time.sleep(0.01) ``` ## Expanding the Number of Words You Can Trigger At this point, you can consider triggering sounds a number of different ways. The Metro M0 Express has 13 digital pins and 6 analog pins which could be used as wired above. Capacitive touch is a very popular method of getting multiple "button" triggers and making sounds. On the Circuit Playground Express, capacitive touch is available on all data pads except **A0**. The Adafruit tutorial [FruitBox Sequencer: Musically Delicious Step Pattern Generator](https://learn.adafruit.com/circuitpython-fruitbox-sequencer-musically-delicious-step-pattern-generator) uses capacitive touch on the Circuit Playground Express to trigger different musical sounds. You can use the same exact CircuitPython code but replace the musical wav files with your word recordings. The words could be "Peach", "Apple", "Orange", "Mango", "Lemon", "Lime", and "Tangerine". Tapping a finger on the fruit triggers the corresponding wav file containing what that fruit is named. Great demonstration for what an inexpensive microcontroller can do! # Make It Talk ## Numbers ## Trigger on Different Conditions You can use the multitude of sensors Adafruit carries to monitor things and trigger voice prompts based on the sensor results.  The program below expands on the code used in the Adafruit tutorial [Make It Sense](https://learn.adafruit.com/make-it-sense). In that guide, the various sensors on a Circuit Playground Express trigger various actions. Those actions could trigger the board to speak various words or phrases also! We'll again use CircuitPython as MakeCode does not have wav file support. You can also see examples of Circuit Playground Express and CircuitPython code in the Adafruit tutorial [CircuitPython Made Easy on Circuit Playground Express](https://learn.adafruit.com/circuitpython-made-easy-on-circuit-playground-express/temperature). For how to use external switches with microcontrollers, see the Adafruit guide [Make It Switch](https://learn.adafruit.com/make-it-switch). ### An Example: Temperature Take the sample CircuitPython code for temperature in Make it Sense. Rather than plot the temperature, you can use a voice to say something depending on the temperature. For example, \> 90 degrees Fahrenheit it says "too hot!" and 32 degrees F or less it says "too cold!". ```auto import time from adafruit_circuitplayground.express import cpx while True: if cpx.temperature > 37.0: # Celsius fever reading cpx.play_file("fever.wav") time.sleep(5) ``` [fever.wav](https://cdn-learn.adafruit.com/assets/assets/000/067/577/original/fever.wav?1544742359) For Circuit Playground Express and sensors available beyond the thermistor, see the [Adafruit Circuit Playground Express guide](https://learn.adafruit.com/adafruit-circuit-playground-express/overview). https://youtu.be/bm-jBX-C_Ls ## Saying Numbers When it comes to numbers, there are literally an infinite number of them. And recording an infinite combination of files would be very tough. All the commercial voice programs break a number into the numeric places and voice those. So for the number 25, you would say the word "Twenty" followed by the number "Five" instead of recording "Twenty Five". The following program expands on the example above, saying the temperature from -299 to 299 degrees Celsius or Fahrenheit.. The numbers have been recorded from the IBM BlueMix site mentioned earlier. Click **Download Project Zip** to get the file  **code.py** and a subdirectory containing the WAV files. Copy **code****.py **to the** CIRICUITPY** drive on a Circuit Playground Express. Besides the numbers, there are some additional files for projects for humidity, clocks, and the words thousand and million that are not needed for this project. The other files should be copied to the **CIRCUITPY** drive in the subdirectory **/numbers**. ![](https://cdn-learn.adafruit.com/assets/assets/000/067/661/medium800/microcontrollers_directory.png?1544814013) https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/Make_It_Talk/code.py ## Going Further With Numbers See the pre-made WAV files files located [in the GitHub repository](https://github.com/adafruit/Adafruit_Learning_System_Guides/tree/master/Make_It_Talk/numbers) and see if you'd like to make a clock, a humidity display, or reading another type of number. Feel free to make your own phrases to go along with the ones we have provided. # Make It Talk ## Lots of Buttons: NeoTrellis ![](https://cdn-learn.adafruit.com/assets/assets/000/067/191/medium800thumb/microcontrollers_ezgif.com-gif-maker.jpg?1544131164) If you want a lot of buttons, you might want to check out the Adafruit NeoTrellis M4 Express. 32 buttons of multicolored glory and 8 megabytes of file storage provides for lots of capability. The flash size means each button cannot read a whole book but words and phrases certainly will fit with room to spare. If you do not have 32 sounds, load up the number you have. Now you can use NeoTrellis as a sound box. Say someone is having voice issues. Load up the words you want, print out a guide to which button does what, and you have a communications device! ## Example Tutorials - [ABC Soundboards with NeoTrellis](https://learn.adafruit.com/abc-soundboards-with-neotrellis/) - uses the techniques in this guide to make two english alphabet soundboards - one for an out of copyright animal book and one for the [Adafruit "E is for Electronics" alphabet color book](https://www.adafruit.com/product/1000). See a video demonstration below. - [Star Trek Soundboard with NeoTrellis](https://learn.adafruit.com/star-trek-sound-board-with-neotrellism4) - Play sound effects from the Original Series https://youtu.be/pne3Jat8EHE # Make It Talk ## Going Further ## Text to Speech in Python While CircuitPython does not have native or library text to speech (as of yet), there are services for Python 3 if you are running on a single board computer (SBC) like Raspberry Pi. ### Google Text to Speech [gTTS, Google Text-To-Speech](https://pypi.org/project/gTTS/) is a Python library from [Pierre-Nick Durette](https://github.com/pndurette/gTTS) that converts a string into an audio file. It does not automatically speak, rather it creates an mp3 file that we can then play. [See this post by Les](https://bigl.es/tooling-tuesday-gtts/) on how to set up gTTS. ### Amazon Polly [Polly](https://aws.amazon.com/polly/) is Amazon's text to speech engine. You will need to sign up for a AWS account to use. ## Featuring Your Projects If you build voice-enabled projects, post video or links to them on Twitter tagging [@Adafruit](https://twitter.com/adafruit), we'd love to see what you are making. ## Guide Products ### Circuit Playground Express [Circuit Playground Express](https://www.adafruit.com/product/3333) **Circuit Playground Express** is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and made it even better! Not only did we pack even more sensors in, we also made it even easier to... In Stock [Buy Now](https://www.adafruit.com/product/3333) [Related Guides to the Product](https://learn.adafruit.com/products/3333/guides) ### Adafruit METRO M0 Express - designed for CircuitPython [Adafruit METRO M0 Express - designed for CircuitPython](https://www.adafruit.com/product/3505) Metro is our series of microcontroller boards for use with the Arduino IDE. This new **Metro M0 Express** board looks a whole lot like our [original Metro 328](https://www.adafruit.com/product/2488), but with a huge upgrade. Instead of the ATmega328, this Metro... In Stock [Buy Now](https://www.adafruit.com/product/3505) [Related Guides to the Product](https://learn.adafruit.com/products/3505/guides) ### Adafruit Metro M4 feat. Microchip ATSAMD51 [Adafruit Metro M4 feat. Microchip ATSAMD51](https://www.adafruit.com/product/3382) Are you ready? Really ready? Cause here comes the fastest, most powerful Metro ever. The **Adafruit Metro M4** featuring the **Microchip ATSAMD51**. This Metro is like a bullet train, with its 120MHz Cortex M4 with floating point support. Your code will zig and zag... In Stock [Buy Now](https://www.adafruit.com/product/3382) [Related Guides to the Product](https://learn.adafruit.com/products/3382/guides) ### Adafruit Feather M4 Express - Featuring ATSAMD51 [Adafruit Feather M4 Express - Featuring ATSAMD51](https://www.adafruit.com/product/3857) It's what you've been waiting for, the Feather M4 Express featuring ATSAMD51. This Feather is fast like a swift, smart like an owl, strong like a ox-bird (it's half ox, half bird, OK?) This feather is powered by our new favorite chip, the **ATSAMD51J19** -  with... In Stock [Buy Now](https://www.adafruit.com/product/3857) [Related Guides to the Product](https://learn.adafruit.com/products/3857/guides) ### USB Powered Speakers [USB Powered Speakers](https://www.adafruit.com/product/1363) Add some extra boom to your audio project with these powered loudspeakers. We sampled half a dozen different models to find ones with a good frequency response, so you'll get quality audio output for music playback. Simply connect the standard 3.5mm stereo plug into your Raspberry Pi model... In Stock [Buy Now](https://www.adafruit.com/product/1363) [Related Guides to the Product](https://learn.adafruit.com/products/1363/guides) ### Small Alligator Clip Test Lead (set of 12) [Small Alligator Clip Test Lead (set of 12)](https://www.adafruit.com/product/1008) Connect this to that without soldering using these handy mini alligator clip test leads. 15" cables with alligator clip on each end, color coded. You get 12 pieces in 6 colors. Strong and grippy, these always come in handy! We often use these in conjunction with a multimeter so we... Out of Stock [Buy Now](https://www.adafruit.com/product/1008) [Related Guides to the Product](https://learn.adafruit.com/products/1008/guides) ## Related Guides - [Adafruit Metro M0 Express](https://learn.adafruit.com/adafruit-metro-m0-express.md) - [Adafruit Circuit Playground Express](https://learn.adafruit.com/adafruit-circuit-playground-express.md) - [Adafruit Metro M4 Express featuring ATSAMD51](https://learn.adafruit.com/adafruit-metro-m4-express-featuring-atsamd51.md) - [Adafruit Feather M4 Express](https://learn.adafruit.com/adafruit-feather-m4-express-atsamd51.md) - [How To Solder Headers](https://learn.adafruit.com/how-to-solder-headers.md) - [Circuit Playground + CircuitPython Quickstart Guide](https://learn.adafruit.com/circuit-playground-express-circuitpython-5-minute-guide.md) - [Paper Craft Zoetrope with Crickit](https://learn.adafruit.com/paper-craft-zoetrope-with-circuit-python.md) - [Snake Charmer Box](https://learn.adafruit.com/snakecharmer.md) - [Multi-Sensor IoT Environmental Sensor Box With CircuitPython](https://learn.adafruit.com/remote-iot-environmental-sensor.md) - [Distance Measurement with Ultrasound](https://learn.adafruit.com/distance-measurement-ultrasound-hcsr04.md) - [Snap Fit Mount for Circuit Playground Express](https://learn.adafruit.com/snap-fit-mount-for-circuit-playground-express.md) - [MX MIDI Guitar](https://learn.adafruit.com/mx-midi-guitar.md) - [Crickit Paddle Wheel Boat](https://learn.adafruit.com/crickit-boat.md) - [Easy Sparkle Pocket T-Shirt](https://learn.adafruit.com/easy-sparkle-pocket-t-shirt.md) - [Make It Bubble](https://learn.adafruit.com/make-it-bubble.md) - [TVA Pruning Baton from Loki](https://learn.adafruit.com/tva-pruning-baton-from-loki.md) - [Circuit Playground Express Spinner Game in MakeCode](https://learn.adafruit.com/circuit-playground-makecode-spinner-game.md) - [Adafruit 1.14" 240x135 Color TFT Breakout LCD Display](https://learn.adafruit.com/adafruit-1-14-240x135-color-tft-breakout.md) - [Zombie Tag Game with Circuit Playground Express](https://learn.adafruit.com/circuit-playground-express-ir-zombie-game.md)