In this video I connect a really tiny FM radio receiver IC, the RDA5807M to an Arduino. This chip came on a cheap module labelled “RRD-102” from Aliexpress.

I give a demo of the breadboarded circuit receiving a transmission from my now vintage Silicon Chip “Micromitter” low-power FM transmitter.

I’m running the module at 3.3V and the Arduino is running at 5V, so I do some level shifting of the I2C bus to avoid frying the RDA5807M.

The RRD-102 module I purchased for US$0.73 delivered: RRD-102 module.

The logic level shifter board I purchased for US$0.71 delivered: Level Shifter.