Telephone-Remote-Control | The YC-KZ02DN is a cheap telephone remote control

Telephone-Remote-Control is a C library typically used in Internet of Things (IoT) applications. Telephone-Remote-Control has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

The YC-KZ02DN is a cheap telephone remote control you can find on eBay and aliexpress. It is usually called something like 12v Telephone remote control. It is a pretty simple device that uses the POTS (Plain old telephone service) to control two relays. It essentially consists of:. I reverse engineered the circuit. For details please look at the [schematic] schematic/phone_control.pdf). Interestingly there are some variants, that come without the HT9170D. These devices have some DIP switches mounted at S2 and will simply act on an incoming call. There has to be another variant, that comes with a potentiometer mounted. The STC15W202S MCU has an integrated bootloader, which allows it to be reprogrammed via a serial interface. The needed pins can be accessed via the unpopulated pin header JP4.