Read a Non-invasive AC Current Sensor (SCT-013) hooked up to a adc (ADS1115) and a ESP-01. Then emit to mqtt. Saves wifi and mqtt creds to SPIFFS. If wifi creds not found will go into AP mode.

Links

https://www.savjee.be/2019/07/Home-Energy-Monitor-ESP32-CT-Sensor-Emonlib/

https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/how-to-build-an-arduino-energy-monitor-measuring-current-only?redirected=true

https://github.com/openenergymonitor/EmonLib

https://cdn-learn.adafruit.com/downloads/pdf/adafruit-4-channel-adc-breakouts.pdf

https://forum.mysensors.org/topic/4887/sct-013-030-to-measure-watt/3

http://www.sensingthecity.com/creating-a-non-invasive-current-sensor/

Web server

https://github.com/Jorgen-VikingGod/ESP8266-WiFi-Relay-Async

Board desgin links

ESP01 I2C

https://simple-circuit.com/esp8266-esp-01-i2c-lcd/

RST and FLASH switch

https://www.instructables.com/id/FTDI-ESP8266-Definitive-Wiring/

https://www.allaboutcircuits.com/projects/breadboard-and-program-an-esp-01-circuit-with-the-arduino-ide/

https://www.allaboutcircuits.com/projects/flashing-the-ESP-01-firmware-to-SDK-v2.0.0-is-easier-now/

https://taillieu.info/index.php/articles/category-list/204-esp8266-developer-board-for-the-esp-01-and-esp-12

Used for FTDI:

https://github.com/ppelleti/avr-arduino-kicad

https://www.forward.com.au/pfod/ESP8266/GPIOpins/ESP8266_01_pin_magic.html