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Wifi_Mqtt_EnergyVariator

  • Adjust 'Power Consumption' of a resistive load (up to 3kW)

  • Data sent to your Domotic Box, raspberry, PC... using an MQTT Broker

  • Listen Power command received on MQTT topic

  • Publish Power values on MQTT 'vload topic'

  • WebOTA : On The Air firmware update on mqtt command ('ota' -> topic/cmd)

    URL : http://<device_ip>:8080/update

Hardware requirements: ~20 €

  • Power variator

The firwmware can manage 2 types of Aliexpress triac power variator ;

aliExpressScr

White PCB doesn't need Level Shifter

Green PCB need Level Shifter on wemos.d5 (3.3v -> 5v) Firmware must use 'reverse pulse'

aliExpressScr

  • ESP Board : Wemos d1 mini (CH341 uart), esp8266

    • When choosing GPIO pins to use, it's best to avoid GPIO 0, 2 and 15 (D3, D4, D8)
    • SCR : D5 on Zero crossing, D6 on SCR signal (- IGBT PWM on D7, TRIAC Dimmer D7-D6)

  • Oled Shield 64x48 option (let use 'define' or 'undef' directive in src/main.cpp code)

    • I2C wired on D1-SCL D2-SDA

  • AC-DC 5V 700mA-Small

Todo :

IGBT : - no human frequency sound - reasonable frequency spurious (vs TRIAC) - very low resistive on transcient region (dv/dt) and can handle more current (less overheating ) - no zero crossing managment

Display Power/Percent/Max on mini screen