Adafruit
TSSP77038 38kHz IR Demodulator Breakout
· MPN: ADA5940
This breakout uses Vishay's TSSP77038 infrared demodulator to give you the raw demodulated output from a 38kHz IR signal, without the extra filtering used in...
This breakout uses Vishay's TSSP77038 infrared demodulator to give you the raw demodulated output from a 38kHz IR signal, without the extra filtering used in typical remote-control receivers. That makes it a handy choice for reflective sensing, light barriers, fast proximity detection, and modulated IR break-beam projects.
Because it responds to modulated IR rather than a constant IR source, it is less affected by ambient light changes and other stray IR sources than a simple phototransistor setup. It's a good fit when you want a less 'intelligent' IR receiver for custom sensing projects, or when you need a simpler alternative to a more integrated proximity sensor.
The board comes fully assembled and tested, with mounting holes to make installation in enclosures or on devices easier. For solder-free use, it works with a 2mm pitch 3-pin STEMMA JST PH cable connected to headers or alligator clips. If you prefer to solder, there is also a 0.1" spaced header for power, ground, and signal. Please note that no cable is included.
It can detect 38kHz IR remote-control signals, but since there is no built-in code filtering you should expect more spurious signals in that sort of application. For proximity sensing and break-beam builds, though, this simpler output can be exactly what you need.
Specifications:
- Product Dimensions: 25.4mm x 17.8mm x 7.2mm / 1.0" x 0.7" x 0.3"
- Product Weight: 1.9g / 0.1oz
Suitable for makers building IR tripwires, object detection rigs, enclosure-mounted sensors, and other projects that need a straightforward 38kHz IR detection output.
Jargon buster
Plain-language definitions for the technical terms used above.
- 2mm pitch
- Pitch is the distance between the centres of neighbouring pins on a connector. A 2mm pitch header is smaller than the common 2.54mm breadboard spacing, so you need matching cables and headers rather than standard breadboard jumper leads.
- break-beam
- A sensing method where an emitter sends a beam of light to a receiver, and an object is detected when it blocks the beam. It is useful for tripwires, counters, and object detection where you need a clear interrupted/not-interrupted signal.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- Headers
- Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
- JST PH
- A small keyed plug-and-socket connector with 2 mm pin spacing, often used for low-power electronics connections. You need the correct JST PH cable, and its current rating limits how much power should be passed through it.
- modulated IR
- Infrared light that is pulsed in a controlled pattern instead of being left on continuously. Using modulation helps the sensor distinguish the intended IR source from sunlight, room lighting, and other background infrared.
- phototransistor
- A light-sensitive transistor that changes its electrical output when light hits it. Compared with a modulated IR receiver, a simple phototransistor can be more affected by ambient light, so it may need extra filtering or careful setup.
- Proximity sensor
- A sensor that detects when an object is nearby without needing physical contact. For this product it matters because the useful detection range is short, up to about 200 mm, so it suits touch-free triggers and close object detection rather than long-distance measuring.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- TSSP77038
- A specific Vishay infrared receiver module tuned to detect 38 kHz modulated IR light and output a cleaned-up digital signal. The part number matters because different IR receiver modules respond to different carrier frequencies and may include different filtering behaviours.
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Sensors & Input
TSSP77038 Datasheet
Datasheet · 438.4 KB · Click any page to view full size
Supplier page — adafruit.com
Supplier Description · 865.1 KB · Click any page to view full size
