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...
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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 board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- Headers
- Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering 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 the presence of a nearby object without physical contact, using methods such as infrared, ultrasonic, capacitive, inductive or time-of-flight. Useful ranges vary widely between types, from a few millimetres to several metres, so check a given sensor's specified range to see whether it suits close-up touch-free triggers or longer-distance detection.
- 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
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Supplier page — adafruit.com
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