MicroPython	Arduino

What is it?

This is an ESP32 based WiFi/Bluetooth coin! It operates at 3.3V, and uses the ESP32-D2WD chipset (Internal 2MiB flash, dual core). It is the size of a US Dime coin (9mm radius) and can fit just about anywhere! SPI/JTAG pins are available, and you can have 1.27mm headers soldered on for an additional fee if you don't feel comfortable soldering something this small.

The EAGLE PCB design files are open source and available in the official Femtoduino github repository.

Ships with MicroPython pre-installed as of 2019-08-07! Also works with ArduinoIDE.

NOTE: You will need a USB to UART adapter with 3.3V supply, as this chip is NOT 5V tolerant! (Adapter not provided.)

MicroPython When uploading a py file (MicroPython), use Adafruit ampy. Note, storage partition size is 640 KiB

If you need to re-flash the MicroPython binary, download from https://downloads.femtoduino.com/micropython/

Arduino When uploading a sketch from Arduino, you will need:

• Additional Boards Manager URL: https://dl.espressif.com/dl/package_esp32_index.json
• Set board to "ESP32 Dev Module"
• Set Flash Size to "2MB"
• Set Flash Mode to "DIO" (Experiment with "QIO" if you'd like)
• Set Flash Speed to "40MHz" (Experiment with "80MHz if you'd like)

Why did you make it?

I want to provide the world's smallest open source coin boards with a variety of features. This product is meant to provide WiFi/Bluetooth features to projects that are constrained by size limits.

What makes it special?

It's so small! There's nothing like it anywhere. If you need a small WiFi design, this is your coin! No need for fancy setups, this baby works with MicroPython right out of the box!