Flashing the Device

Flashing the device

• Connect serial port (RX/TX/GND)

• Pull IO0 to GND during reset

• I'm using /dev/cu.usbserial in the following commands, this may vary depending on the device you are using.

• Optional - Backup flash:

esptool.py --port /dev/cu.usbserial --baud 460800 read_flash 0 2097152 orig_fw.bin

• Erase flash:

esptool.py --port /dev/cu.usbserial --baud 460800 erase_flash

• Flash micropython:

esptool -p /dev/cu.usbserial --baud 460800 write_flash 0 firmware-combined.bin

If you are getting errors, try a lower baud rate (230400 or 115200).

This firmware image is based on micropython 1.9.4 and already includes Picoweb and umqtt (robust and simple) as frozen byte code.