circalamp

Arduinuish circadian lamp

esp-01 / esp-01s

• To enter serial bootloader:
  • Reset: with power on, or nRESET pin was low and is pulled high, or CH_PD/EN was low and is pulled high.
  • GPIO0 pulled low.

Both CH_PD/EN and nRESET must be high for the chip to start operating.

debug logging is at 74880 baud rate.

Resources:

• A Python-based, open source, platform independent, utility to communicate with the ROM bootloader in Espressif ESP8266 & ESP32 chips.
• Flash firmware:
  • https://www.allaboutcircuits.com/projects/flashing-the-ESP-01-firmware-to-SDK-v2.0.0-is-easier-now/
  • With programmer diagram: https://www.allaboutcircuits.com/projects/update-the-firmware-in-your-esp8266-wi-fi-module/
  • 3.0.0 firmware: https://github.com/espressif/ESP8266_NONOS_SDK/releases/tag/v3.0
• Getting started with AT commands.
• Tutorial, AT commands, diagram and web server with libraries.

FTDI USB-to-serial:

• Drivers: https://www.ftdichip.com/Drivers/VCP.htm

Arduino

• millis() rollover discussion.

General

• Inspiration: Circadia - sunrise lamp