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My Mini Race Car
Bluetooth controlled, temperature sensing Formula E racer!
by John Park
Zooooom! Now you can build and drive your own Mini Race Car using the Feather 32u4 Bluefruit LE microcontroller. Keep an eye on racetrack telemetry with the included HTU21D-F temperature & humidity sensor breakout board.
Level Shifting 3.3V microcontrollers and NeoPixels
Level shifters are like little bilingual translators for your electronics!
by John Park
NeoPixels rule! But, they expect 5V logic, which can cause them to act funny when controlled by 3v3 boards, such as Feathers, M0-based Arduinos, Teensy 3, and others. Not to worry! A level shifter can translate 3v3 logic to 5V and get things talking again in no time!
Kombucha Thermostat with CircuitPython and Feather
Kombucha, It's ALIVE and it needs a smart heater
by Scott Shawcroft
Brewing Kombucha in cool climates is challenging. In this guide we use Adafruit's Feather M0 and CircuitPython to create a thermostat for brewing the perfect 'Buch all year round.
Adabox 001 Temperature Alarm
A Temperature Monitor and Alarm with parts from Adabox 001
by Kirby Griese
Build a Temperature Monitor and Alarm using the parts included in Adabox 001.
Adafruit MAX31865 RTD PT100 Amplifier
PT100 Cruisin'
by lady ada
To get precision and accuracy out of your PT100 RTD you must use an amplifier that is designed to read the low resistance. Better yet, have an amplifier that can automatically adjust and compensate for the resistance of the connecting wires. If you're looking for a great RTD sensor, today is your lucky day because we have a lovely Adafruit RTD Sensor Amplifier with the MAX31865 breakout for use with any 2, 3 or 4 wire PT100 RTD!
How Cold Is It?
Let Circuit Playground help you find out.
by Carter Nelson
Turn the Circuit Playground into a cold temperature indicator using the on board temperature sensor.
Adafruit MAX31856 Universal Thermocouple Amplifier
Now you can handle any kind of thermocouple!
by lady ada
Thermocouples are very sensitive, requiring a good amplifier with a cold-compensation reference, as well as calculations to handle any non-linearities. For a long time we've suggested our MAX31855K breakout, which works great but is only for K-type thermocouples. Now we're happy to offer a great new thermocouple amplifier/converter that can handle just about any type of thermocouple, and even has the ability to give you notification when the temperature goes out of range, or a fault occurs. Very fancy! This converter communicates over 4-wire SPI and can interface with any K, J, N, R, S, T, E, or B type thermocouple
Adafruit Si7021 Temperature + Humidity Sensor
Get the current ambient temperature and humidity
by lady ada
This lovely sensor for Silicon labs has ± 3% relative humidity measurements with a range of 0–80% RH, and ±0.4 °C temperature accuracy at a range of -10 to +85 °C. Great for all of your environmental sensing projects. It uses I2C for data transfer so it works with a wide range of microcontrollers.
Breadboards for Beginners
Diagrams, tips and tricks to take you from beginner to brilliant
by lady ada
When you start on your electronics journey, you will eventually need to wire up some parts to follow along with some project. And, chances are, you will be prodded towards using a breadboard. These ubiquitous pale slabs of plastic are everywhere when it comes to electronics hacking.
Vibro-bugz
Making Small and Simple
by Rick Winscot
Use 3D printing, a motor, battery, and some googly eyes to teach basic maker skills.
Fair Weather Friend: Internet-Connected Migraine or Allergies Detector
"Web scraping" provides an alternative to restrictive programming APIs
by Phillip Burgess
Using forecasts by AccuWeather.com, this wireless ambient display predicts health issues like allergies or arthritis, or good days ahead for leisure activities like golf or sailing.
Adafruit DS3231 Precision RTC Breakout
Repent and temperature-compensate your oscillator, said the tick-tock man!
by lady ada
The datasheet for the DS3231 explains that this part is an "Extremely Accurate I²C-Integrated RTC/TCXO/Crystal". And, hey, it does exactly what it says on the tin! This Real Time Clock (RTC) is the most precise you can get in a small, low power package.
Geofencing with the FONA 808 & Adafruit IO
Build a geofencing project that will send alerts when it goes out of the perimeter!
by M. Schwartz
In this project, you will learn how to build a geofencing project, that you will be able to track online.
Qi Wireless Recharging Battery Case
Add wireless charging to your phones' battery case!
by Rick Winscot
Thinking about using a battery case for your phone, but don't want to give-up wireless charging? Have no fear, Qi is here! Now you can have a 'battery storage' case that can recharge itself without need of wires.
Remote controlled door lock using a fingerprint sensor & Adafruit IO
Open a door lock from anywhere by simply using your fingerprint!
by M. Schwartz
In this project, you will learn how to control a door lock remotely, simply by using your fingerprint. Because we'll be using Adafruit IO, the fingerprint sensor & the lock can be in completely different places.
Mini Pan-Tilt Kit Assembly
What to do with that bag of parts.
by Bill Earl
This step-by-step guide to assembling the Mini Pan-Tilt kit will have you panning and tilting in just a few short minutes.
Adafruit BMP280 Barometric Pressure + Temperature Sensor Breakout
Buld your next weather sensing system
by lady ada
Bosch has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature and barometric pressure! This sensor is great for all sorts of weather/environmental sensing and can even be used in both I2C and SPI!
Home Automation in the Cloud with the ESP8266 & Adafruit IO
Build a simple home automation system & control it from anywhere!
by M. Schwartz
In this guide, we are going to build two modules based on the ESP8266: a sensor module, and a lamp controller module. We will then use Adafruit IO to control these modules from anywhere.
Print Your Own Circuit Boards
Begin printing your own circuit boards now!
by Adam Kohring
This guide will teach you how to turn your board design into a printed circuit board.
Calibrating Sensors
Get peak performance from all your sensors.
by Bill Earl
Most modern sensors perform quite well right out-of-the box. But the sensor is only part of the measurement system. For best accuracy in critical applications, you will want to calibrate.
Portable Apple Watch Charger
Hack your existing charger and build your own portable charger
by Ruiz Brothers
Here’s how to build a wireless charger for the Apple Watch.
POPULAR
ESP8266 Temperature / Humidity Webserver
Using the ESP8266 as a microcontroller as well as a low cost wifi server.
by Mike Barela
The ESP8266 combines wifi capability with a powerful microcontroller. With the ability to run Arduino code on this microcontroller, webserver and DHT humidity and temerature sensor libraries can be used to create a very low cost IoT device
Piezo Ring Tones with Raspberry Pi
Play ringtones with a piezo buzzer on Raspberry Pi.
by Roberto Marquez
The Raspberry Pi's GPIO pins are used to play RTTTL sequences on a piezo buzzer. It is Web enabled and Java-powered. The Web app has built in RTTTL tones, as well as input controls for playing user provided RTTTL tones.
XBee Radios
Simple wireless communication
by lady ada
XBee modems are one of the easiest ways to create a wireless point-to-point or mesh network. They have error correction, are configured with AT commands, come in multiple flavors and can create a wireless serial link out of the box! I wanted to make a wireless Arduino project but all the adapter boards on the market made me unhappy. So I designed what I think is an excellent low-cost adapter board.
Monitor Your Home With the Raspberry Pi B+
Remotely access temperature and humidity levels (plus camera shots) around your house!
by M. Schwartz
There are lots of devices on the market that allow you to monitor your home from a central interface. In this guide, we are going to make our own DIY version of such devices, based on the Raspberry Pi B+.