Circuit diagram

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)