Imported from GitHub: chof747/wlan-thermostat · commit 76f4cdd · license CC0-1.0

Description

WLAN Thermostat module to be controlled by Home Assistant via esphome

README

wlan-thermostat

Wireless Thermostats for elecrically triggerd heatings

This is the front panel of a wireless triggered heating which can be connected to a second board that contains the power supply and a relais capeable of switching the required electrical load. The front panel is designed to be attached in a perpendicular way to the back part.

Elements:

• An ESP8266-12F module containing the microcontroller, Flash
• A SHT40 temperature and humidity sensor
• A rotary encoder for input
• A SSD1306 OLED display for output
• Voltage regulator to regulate the 5V from the back board to 3v3 for the ESP8266
• Programming logic and headers
• Headers to connect to the back board for power control and relay switching

Used Parts:

Revision History:

• v1.0: Initial version (Produced: 12.06.2023; First assembled: 29.06.2023)

• v1.1: Fixing after component testin (Produced: 15.07.2023; First assembled: 31.07.2023 / Frontend)

  1. Frontend:
  • Fixing of strapping pins of ESP-12F
  • Fixing of thermocoupling between ESP-12F and the temperature sensor
  • Introduction of UMH3N chip to replace two transistors + two resistors for the auto-reset circuit
  • Introduced resistor array to manage strapping pins
  • Switching of pins as follows:
    • Rotary Encoder Button now GPIO0 (doubling as a fallback mode for programming)
    • Relay pin: GPIO13
  2. Backend
  • Fixed orientation of Relay Footprint
  • Fixed size of footprint for optocoppler
  • Changed pinheaders for frontend connection from smd to throughole
  • Rearranged board placing to manage changed footprints

• v1.2: Alternate version without (exposed) ground panel at the back of the frontend thermo sensor

• v1.3b: Moved the temperature sensor to a sidearm sticking out of the board (produced 18.09.2023)

• v1.2 (backend): Corrected pin order of transistor switching relay (Produced: 15.10.2023)