It uses a one-time programmable microcontroller and the RDA1846 transceiver. With the power traces to the MCU cut, [Lior] was able to send his own signals to the chip over I2C using an Arduino.

The Arduino is a powerful platform for interfacing with the real world, but it isn’t without limits. One of those hard limits, even for the Arduino MEGA, is a finite number of pins that the m… ...

A while ago I received a couple of I/O port expander modules that use the I2C protocol. Using that Chinese module, you can use only the SDA and SCL pins ...

This module is built around NXP PN532, and the maker break out almost all of the I/O pins of the NXP532 chip on this little module. This Arduino-compatible module has the following features: Supports ...