Building a temperature control for sour dough (Gärbox)
Componentns
SHT31
Wio Link from seed with ESP8266 (any ESP8266 board will do)
relay that can be controlled through GPIO
heating mat, e.g. for cats or for reptiles or ... Mine was with 12V power supply, so the controller had to switch 1A 12V power to the heating
Setup/configuration
create wifisecrets.h file and define WIFI_SSID and WIFI_PASSWORD (look at main.cpp)
default temperature is 26, if you set it via the webserver route, it will be stored in EEPROM of the ESP8266
WebServer Routes
/temperature: retrieve json with temperature, humidity, heating status and target temperature, if you pass in ?target_temperature=xx as parameter, the target temperature will be set
Test methods
/relay/on: will switch on the relay (until temperature management switches it off again)
/relay/off: will switch off the relay (until temperature management switches it on again)
Implementation notes
webserver is running async
did produce crashes when reading sensor data in async handlers
all sensor reads, pin writes are now triggered through the loop()
only changes relay every x clock ticks through temperature mesaurements, to avoid flapping of relay
last target temperature is stored in EEPROM
SHT31
Grove connector for I2C:
pin 1 - Yellow (for example, SCL on I2C Grove Connectors)
pin 2 - White (for example, SDA on I2C Grove Connectors)
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