Bluetooth UART working (with bodges)

A project log for FEMU - An ESP32 Wi-Fi/Bluetooth board in TOMU form

Just for the sake of making it happen, I've designed an open-source TOMU form factor ESP32 design. It fits in a USB Type-A port.

femtoduinofemtoduino 10/16/2019 at 06:380 Comments

FEMU, with bodged RF inductor, appears to transmit just fine. There's some kind of issue going on with power supply, possibly related to grounding a few traces directly to the USB ground pin, and even more likely, due to the FTDI chip getting back powered at some point by the ESP32 chip... If I try any wireless stuff while plugged in to a computer, wireless stuff refuses to work. I modded a Bluetooth Arduino sketch I had (disabled all Serial comms), uploaded to the FEMU, and then powered the FEMU off a USB battery. Success! I was able to send a command and change the RGB color! to why two out of three RGB pins aren't PWMing... I'm not sure. There's more work to be done before I order another PCB revision. Stay tuned!