12V Bluetooth Relay Module - Mobile Phone Wireless Remote Control Switch - IoT

Even with instructions provided by another person who purchased this and figured out how to make this work, no luck for me. Why should we have to deal with all this anyway ? Just provide a working app that simplifies usage like everyone else.

In November '25, Google Play had none of the apps mentioned by the other reviewers. Perplexity recommended using a general purpose Serial Bluetooth Terminal app, so I downloaded one with that name, and set the on-off macros as another reviewer suggested: On = A0 01 02 A2 Off = A0 01 00 A1 These are entered in hex format. The app displays all the bluetooth devices available; mine (a single relay board) was called JDY-33-SPP; connect password was 1234. Then long press the M buttons to enter the hex codes, at it works. (4 stars because of the lack of information included with the board).

Doesn't work

Set to HEX, and use A00101A2 for ON, A001001A1 for OFF. Then use A002001A3 for ON (second relay), A00200A2 for OFF (second relay). Then third relay A00301A4 ON, A00300A3 OFF, Do each relay the same, just up the numbers.