Circuit diagram and sensors

The beehive scales structure.

For the sake of simplicity, the Internet connection via Surfstick or WLAN and the power supply were not included in this schematic.

Ports

  • A/D converter (HX711) for the load cells:
    • VCC at Pin 02/5V (better a 3,3V Pin)
    • GND at Pin 06/Ground
    • DT at Pin 29/GPIO5
    • SCK at Pin 31/GPIO6
  • Breeding chamber temperature sensors (DS18B20):
    • Pin 17/3.3V
    • Pin 14/Ground
    • Pin 07/GPIO4 [from Version v0.1.1 it is GPIO11]
  • Temperature, humidity, air pressure and air quality (BME680):
    • VCC at Pin 04/5V
    • GND at Pin 09/Ground
    • SCK at Pin 05/SCL
    • SDI at Pin 03/SDA
    • (if SD0 is present, then: SD0 to a ground)
  • Button for switching between maintenance and measuring mode:
    • Pin 01/3.3V
    • Pin 11/GPIO17 [from version v0.1.1 it is GPIO16]

➡ to the shopping list of the used components

In the schematic above not all sensors supported by us are shown, because various sensors can be connected flexibly.

  • Temperature and humidity (DHT11/DHT22):
    • Pin 17/3.3V
    • Pin 14/Ground
    • arbitrary free GPIO (z.B. GPIO9)
  • Status display (LED):
    • Pin 40/GPIO21
    • Pin 30/GND

Other supported sensors:

  • BME280 (Temperature + Humidity + Air Pressure)
  • MAX6675 ( Temperature)
  • MAX31855 ( Temperature)

Translated 28.07.2019 by JK

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