# Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
## Overview
While designing our [IR decoding breakout](https://www.adafruit.com/product/5939), we noticed the [TSSP series of chips from Vishay](https://www.vishay.com/docs/82470/tssp770.pdf). These are simpler than more 'remote control' receivers in that they don't do any filtering on the codes received: you really just get the demodulated-from-38KHz-signal output.
According to Vishay, they're designed for "Reflective Sensing, Light Barriers, and Fast Proximity Applications". These sensors could be interesting for use when you want a less-'intelligent' IR decoder, or for proximity projects where you don't want to go all-out for a [VCNL I2C sensor](https://www.adafruit.com/product/4161).
These are good for creating break-beams where the IR light is modulated rather than just solid on, because you won't be affected by other IR signals or ambient light changes.
This board will work nicely for a variety of IR detecting projects, and with mounting holes and a cable, a lot easier to mount in enclosures and on devices. Using a 2mm pitch STEMMA JST PH cable with headers or alligator clips on the end, you can easily wire this board without any soldering.
Note that this board is specifically for proximity sensing or break-beam projects. While it can receive 38KHz IR remote control signals - there isn't a filter system so you'll get a lot of spurious signals.
Each STEMMA board is a fully assembled and tested PCB but no cable. No soldering is required to use it, but you will need to pick up [a 2mm pitch, 3-pin STEMMA JST PH cable](https://www.adafruit.com/?q=jst+ph+3&sort=BestMatch). Alternatively, if you _do_ want to solder, there's a 0.1" spaced header for power/ground/signal.
# Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
## Pinouts
## Power Pins
- **VIN/V+** - this is the power pin. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V.
- **GND** - common ground for power and logic.
## Signal Output
- **SIG/Sig** - this is the output signal from the infrared demodulator. When a 38KHz signal is received, the IR signal is piped out the Signal pin into your microcontroller.
Warning: This board is specifically for proximity sensing or break-beam projects. It can receive 38KHz IR remote control signals but there isn't a filter system so you'll get a lot of spurious signals.
## STEMMA JST PH
- [**STEMMA JST PH**](https://learn.adafruit.com/introducing-adafruit-stemma-qt) - 2mm pitch STEMMA JST port for use with [3-pin STEMMA JST PH cables](https://www.adafruit.com/category/619). It has connections for:
- **GND** - common ground for power and data. It is the black wire on the JST PH cable.
- **V+** - power input for the infrared demodulator. It is the red wire on the JST PH cable.
- **Sig** - signal to your microcontroller. It is the white wire on the JST PH cable.
## Signal LED and Jumper
- **Signal LED** - to the left of the JST PH connector is the signal LED, labeled **Sig**. It is the red LED. It will light up when an IR signal is read by the demodulator.
- **LED jumper** - in the center of the back of the board is a jumper for the signal LED. It is labeled **Sig** on the board silk. If you want to disable the signal LED, cut the trace on this jumper.
## Power LED and Jumper
- **Power LED** - to the right of the JST PH connector is the power LED, labeled **ON**. It is the green LED.
- **LED jumper** - in the center of the back of the board is a jumper for the power LED. It is labeled **On** on the board silk. If you want to disable the power LED, cut the trace on this jumper.
# Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
## CircuitPython and Python
It's easy to use the **Infrared IR Demodulator Breakout** with CircuitPython and the [pulseio](https://docs.circuitpython.org/en/latest/shared-bindings/pulseio/index.html) core module. This module allows you to easily write Python code for sending and receiving pulse signals.
You can use this driver with any CircuitPython microcontroller board or with a computer that has GPIO, [pulseio](https://docs.circuitpython.org/projects/blinka/en/latest/api.html#pulseio-pulse-width-modulation-input-and-output-control) support and Python [thanks to Adafruit\_Blinka, our CircuitPython-for-Python compatibility library](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux). Not all single board computers (SBCs) have pulseio support. Make sure to [check if it is supported](https://docs.circuitpython.org/en/latest/shared-bindings/pwmio/index.html#module-pwmio) on your board.
You'll need an IR LED or IR remote controller to use this example with the demodulator:
### Adafruit High Power Infrared IR LED Emitter - STEMMA JST PH 2mm
[Adafruit High Power Infrared IR LED Emitter - STEMMA JST PH 2mm](https://www.adafruit.com/product/5639)
_\*pew\* \*pew\*_! This board is like a little ray gun for infrared light, with two high powered LED outputs. When controlled with the onboard N-Channel FET driver, you'll be blasting 100mA-200mA of current pulsing through each LED for 10+ meters of range! This is the easiest...
In Stock
[Buy Now](https://www.adafruit.com/product/5639)
[Related Guides to the Product](https://learn.adafruit.com/products/5639/guides)
### Mini Remote Control
[Mini Remote Control](https://www.adafruit.com/product/389)
This little remote control would be handy for controlling a robot or other project from across the room. It has 21 buttons and a layout we thought was handy: directional buttons and number entry buttons. The remote uses the NEC encoding type and sends data codes 0 thru 26 (it skips #3, #7,...
In Stock
[Buy Now](https://www.adafruit.com/product/389)
[Related Guides to the Product](https://learn.adafruit.com/products/389/guides)
Warning: This board is specifically for proximity sensing or break-beam projects. It can receive 38KHz IR remote control signals but there isn't a filter system so you'll get a lot of spurious signals.
## CircuitPython Microcontroller Wiring
First wire up the sensor to your board exactly as follows. The following is the demodulator wired to a Feather RP2040 with a JST PH cable.
- **Board 3V** to **demodulator JST PH** **V+ (red wire)**
- **Board GND** to **demodulator**** JST PH GND (black wire)**
- **Board pin 5** to **demodulator** **JST PH** **Sig (white wire)**
The following is the demodulator wired to a Feather RP2040 using a solderless breadboard:
- **Board 3V** to **demodulator**** ****VIN (red wire)**
- **Board GND** to **demodulator**** GND (black wire)**
- **Board pin 5** to **demodulator** **SIG (white wire)**
## Python Computer Wiring
Since there are _dozens_ of Linux computers/boards you can use, we will show wiring for Raspberry Pi. For other platforms, [please visit the guide for CircuitPython on Linux to see whether your platform is supported](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux).
Here's the Raspberry Pi wired to the demodulator using a JST PH cable:
- **Pi 3V** to **demodulator**** JST PH V+ (red wire)**
- **Pi GND** to **demodulator**** JST PH GND (black wire)**
- **Pi GPIO5** to **demodulator**** JST PH Sig (white wire)**
Here is how you'll wire the demodulator to a Raspberry Pi with a breadboard:
- **Pi 3V** to **demodulator VIN (red wire)**
- **Pi GND** to **demodulator**** GND (black wire)**
- **Pi GPIO5** to **demodulator** **SIG (white wire)**
## Python Installation
You'll need to install the **Adafruit\_Blinka** library that provides the CircuitPython support in Python. This may also require enabling I2C on your platform and verifying you are running Python 3. [Since each platform is a little different, and Linux changes often, please visit the CircuitPython on Linux guide to get your computer ready](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux)!
## CircuitPython Usage
To use with CircuitPython, you need to update **code.py** with the example script.
Thankfully, we can do this in one go. In the example below, click the **Download Project Bundle** button below to download the **code.py** file in a zip file. Extract the contents of the zip file, and the **code.py** file to your **CIRCUITPY** drive.
Info: Only core modules are used for this example. No additional libraries need to be added to the /lib folder.
## Python Usage
Once you have the library `pip3` installed on your computer, copy or download the following example to your computer, and run the following, replacing **code.py** with whatever you named the file:
`python3 code.py`
## Example Code
**If running CircuitPython:** Once everything is saved to the **CIRCUITPY** drive, [connect to the serial console](https://learn.adafruit.com/welcome-to-circuitpython/kattni-connecting-to-the-serial-console) to see the data printed out!
**If running Python:** The console output will appear wherever you are running Python.
https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/STEMMA_IR_Demodulator_Examples/CircuitPython/code.py
In the code, if an IR pulse is detected, its pulses are printed to the serial monitor. An additional variable `pulse_count` keeps track of how many times a new pulse is detected. The `pulse` state tracks whether a pulse input is detected or not by the demodulator. You can use this code as a template for using the demodulator as a proximity sensor or break-beam.
Here is the output using an IR remote with the demodulator:
Here is the output using an IR LED emitter with the modulator:
# Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
## Python Docs
# Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
## Arduino
Using the Infrared Infrared IR Demodulator Breakout with Arduino involves wiring up the demodulator to your Arduino-compatible microcontroller, installing the [IRremote](https://github.com/Arduino-IRremote/Arduino-IRremote) library, and running the provided example code.
You'll need an IR LED or IR remote controller to use this example with the demodulator:
### Adafruit High Power Infrared IR LED Emitter - STEMMA JST PH 2mm
[Adafruit High Power Infrared IR LED Emitter - STEMMA JST PH 2mm](https://www.adafruit.com/product/5639)
_\*pew\* \*pew\*_! This board is like a little ray gun for infrared light, with two high powered LED outputs. When controlled with the onboard N-Channel FET driver, you'll be blasting 100mA-200mA of current pulsing through each LED for 10+ meters of range! This is the easiest...
In Stock
[Buy Now](https://www.adafruit.com/product/5639)
[Related Guides to the Product](https://learn.adafruit.com/products/5639/guides)
### Mini Remote Control
[Mini Remote Control](https://www.adafruit.com/product/389)
This little remote control would be handy for controlling a robot or other project from across the room. It has 21 buttons and a layout we thought was handy: directional buttons and number entry buttons. The remote uses the NEC encoding type and sends data codes 0 thru 26 (it skips #3, #7,...
In Stock
[Buy Now](https://www.adafruit.com/product/389)
[Related Guides to the Product](https://learn.adafruit.com/products/389/guides)
Warning: This board is specifically for proximity sensing or break-beam projects. It can receive 38KHz IR remote control signals but there isn't a filter system so you'll get a lot of spurious signals.
## Wiring
Wire as shown for a **5V** board like an Uno. If you are using a **3V** board, like an Adafruit Feather, wire the board's 3V pin to the breakout VIN.
Here is an Adafruit Metro wired up to the demodulator using a JST PH cable.
- **Board 5V** to **demodulator JST PH** **V+ (red wire)**
- **Board GND** to **demodulator**** JST PH GND (black wire)**
- **Board pin 5** to **demodulator** **JST PH** **Sig (white wire)**
Here is an Adafruit Metro wired up using a solderless breadboard:
- **Board 5V** to **demodulator** **VIN (red wire)**
- **Board GND** to **demodulator**** ****GND (black wire)**
- **Board pin 5** to **demodulator** **SIG (white wire)**
## Library Installation
You can install the **IRremote** library for Arduino using the Library Manager in the Arduino IDE.
Click the **Manage Libraries ...** menu item, search for **IRremote** , and select the ** IRremote** library:
Info: There are no additional dependencies needed for this library.
## Example Code
https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/STEMMA_IR_Demodulator_Examples/Arduino_STEMMA_IR_Demodulator_Example/Arduino_STEMMA_IR_Demodulator_Example.ino
Upload the sketch to your board and open up the Serial Monitor ( **Tools -\> Serial Monitor** ) at 115200 baud. As you send IR signals to the demodulator, you'll see the raw data packets print to the Serial Monitor. You'll also see the `signal_count`, which increases in value by `1` every time a new signal is detected. A boolean state called `ir_state` is `true` when a signal is detected and `false` when a signal is not detected. You can use this code as a template for using the demodulator as a proximity sensor or break-beam.
Here is the output using an IR remote with the demodulator:
Here is the output using an IR LED emitter with the demodulator:
# Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
## Arduino Docs
# Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
## Downloads
## Files
- [TSSP77038 Datasheet](https://cdn-learn.adafruit.com/assets/assets/000/129/632/original/tssp770.pdf?1714051517)
- [EagleCAD PCB Files on GitHub](https://github.com/adafruit/Adafruit-TSSP77038-IR-Demodulator-Breakout-PCB)
- [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library/blob/master/parts/Adafruit%20TSSP77038%20IR%20Demodulator%20Breakout.fzpz)
## Schematic and Fab Print
## Primary Products
### Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout
[Adafruit TSSP77038 38KHz Infrared IR Demodulator Breakout](https://www.adafruit.com/product/5940)
While designing our [IR decoding breakout](https://www.adafruit.com/product/5939) we noticed the [TSSP series of chips from Vishay](https://www.vishay.com/docs/82470/tssp770.pdf), these are simpler than more 'remote control' receivers in that they don't...
In Stock
[Buy Now](https://www.adafruit.com/product/5940)
[Related Guides to the Product](https://learn.adafruit.com/products/5940/guides)
## Featured Products
### Mini Remote Control
[Mini Remote Control](https://www.adafruit.com/product/389)
This little remote control would be handy for controlling a robot or other project from across the room. It has 21 buttons and a layout we thought was handy: directional buttons and number entry buttons. The remote uses the NEC encoding type and sends data codes 0 thru 26 (it skips #3, #7,...
In Stock
[Buy Now](https://www.adafruit.com/product/389)
[Related Guides to the Product](https://learn.adafruit.com/products/389/guides)
### Adafruit High Power Infrared IR LED Emitter - STEMMA JST PH 2mm
[Adafruit High Power Infrared IR LED Emitter - STEMMA JST PH 2mm](https://www.adafruit.com/product/5639)
_\*pew\* \*pew\*_! This board is like a little ray gun for infrared light, with two high powered LED outputs. When controlled with the onboard N-Channel FET driver, you'll be blasting 100mA-200mA of current pulsing through each LED for 10+ meters of range! This is the easiest...
In Stock
[Buy Now](https://www.adafruit.com/product/5639)
[Related Guides to the Product](https://learn.adafruit.com/products/5639/guides)
### STEMMA JST PH 2mm 3-Pin to Male Header Cable - 200mm
[STEMMA JST PH 2mm 3-Pin to Male Header Cable - 200mm](https://www.adafruit.com/product/3893)
This cable will let you turn a JST PH 3-pin cable port into 3 individual wires with high-quality 0.1" male header plugs on the end. We're carrying these to match up with our Hallowing, for extending and connecting sensors or LEDs - and the wires are even color coded!
In Stock
[Buy Now](https://www.adafruit.com/product/3893)
[Related Guides to the Product](https://learn.adafruit.com/products/3893/guides)
### STEMMA JST PH 2mm 3-Pin to Female Socket Cable - 200mm
[STEMMA JST PH 2mm 3-Pin to Female Socket Cable - 200mm](https://www.adafruit.com/product/3894)
This cable will let you turn a JST PH 3-pin cable port into 3 individual wires with high-quality 0.1" female header sockets on the end. We're carrying these to match up with our Hallowing, for extending and connecting sensors or LEDs - and the wires are even color coded!
In Stock
[Buy Now](https://www.adafruit.com/product/3894)
[Related Guides to the Product](https://learn.adafruit.com/products/3894/guides)
### JST PH 2mm 3-pin Plug to Color Coded Alligator Clips Cable
[JST PH 2mm 3-pin Plug to Color Coded Alligator Clips Cable](https://www.adafruit.com/product/4030)
This cable will let you turn a JST PH 3-pin cable port into 3 individual wires with grippy mini alligator clips. We're carrying these to match up with any of our boards or breakouts with 3-pin 'STEMMA' connectors on them such as the
In Stock
[Buy Now](https://www.adafruit.com/product/4030)
[Related Guides to the Product](https://learn.adafruit.com/products/4030/guides)
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