Digital 38khz Ir Receiver Ir Transmitter Sensor Module

These are not Bluetooth which works in the Bluetooth radio frequency band . These are infrared.

absolute rubbish

These units seem to work well. I’ve only used two transmitters and one receiver so far, but they’ve worked with an Arduino quite well (with a basic IR library).

Both the receiver and transmitter worked fine with my 3.3v ESP8266 NodeMCU board. I just connect the VCC, GND, DATA pins directly to ESP's 3.3v, GND, D5 (in my case) pins. Used the IRRemoteESP8266 library. The transmitter isn't terribly wide (Can't bounce off the ceiling like my remote can) but range of at least 5-10 ft... haven't tried farther.

Great little IR receivers. Wish the data sheet were clearer

Worked exactly how I needed them to. Some. Of the IR LED's are mounted a tad bit skewed but nothing a little push couldn't correct.

I got 3 receiver modules and 3 emitter modules. I see no indication that the IR LEDs are emitting through my phone's camera. I tried the visible LED trick to check wiring, and even a visible LED is not driven by the board. it looks like the board's internal circuitry is incorrect and just does not fire the LEDs at all. (I do see the status indicator LED, though, so the board is receiving a signal.) Not only that, but attempting to direct drive the IR LEDs does nothing, so they are either all dead or require a lot more current than expected. In retrospect, I should have just bought a bag of IR LEDs and used resistors. The _receiver_ boards work flawlessly, though.