Circuit diagram

DIY electronic Hydrometer


Circuit diagram

Schematic

Connection assignment

GY-521

  • D4 -> SCL of the GY-521
  • D3 -> SDA of the GY-521
  • 5V -> VCC
  • GND -> GND
  • remaining ports unoccupied
  • Remove the resistor of the GY LED! (Retirement)

Resistors

  • BAT43 or better schottky diode (cathode to D0) or 330 ohms resistor between D0 and RST
  • 230k ohms of A0 -> 5V
  • 4k7 ohms of D6 -> 5V

DS18B20

  • DQ goes to D6 VCC and 5V
  • GND -> GND

Wemos

  • Remove the input diode (short circuit via Lipomodul!)
  • Switch / Reed between + 5V and Lipomodul + OUT
  • GND -> GND

Lipo Lademodul

  • Battery to B + and B-
  • GND -> GND
  • + OUT switch to + 5V Wemos D1 mini
  • + IN to USB + 5V of the Wemos D1 mini (optional)