A simple remote to turn on a pc (or anything with physical access to the power button leads) with 2 raspberry pi picos or a pi + pico.
A pico transmitter and receiver
The transmitter part to connect to a pico receiver
The power on command is authenticated with a CBC-MAC. Add src/key.h with a 16 byte PRESHARED_KEY_ENCRYPTION and PRESHARED_KEY_AUTH, e.g.:
static const uint8_t PRESHARED_KEY_ENCRYPTION[] = {
0xF3, 0x75, 0x52, 0x64, 0x9E, 0x9D, 0xD1, 0x51,
0x97, 0x49, 0x0D, 0x80, 0x9A, 0x8F, 0x0B, 0xA0
};
static const uint8_t PRESHARED_KEY_AUTH[] = {
0x76, 0x4E, 0x79, 0x50, 0x1E, 0x68, 0x61, 0xCF,
0x3F, 0x64, 0xDD, 0xEE, 0x5B, 0x41, 0xC3, 0x19
};