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Device Setup Instructions

What you’ll need

  • 1x Raspberry pi 4
  • 1x Canakit RPI4 GPIO ribbon cable
  • 1x Canakit GPIO T connector
  • 3x Generic GPIO buttons
  • 1x Blue LED
  • 1x Red LED
  • 1x 16x2 Canakit grid display
  • 3x 10kΩ resistors (BROWN, BLACK, ORANGE, GOLD)
  • 2x 220Ω resistors (RED, RED, BROWN, GOLD)
  • 1x Potentiometer
  • 24x Dupont cables
  • 1x I2C ADAFruit AHT20 Temperature & Humidity Sensor

Before we go any further place your T connector at the top of your GPIO breadboard. Connect the T connector to the RPI GPIO pin set. Finally connect the AHT20 sensor via I2C on the RPI itself.

Wiring Instructions

Wiring the display

  1. Place the 16x2 Canakit grid display with the left most pin at D44. The remainder of the pins will fall into place.
  2. Run a Dupont cable from E44 to any GND (Ground) pin.
  3. Run a Dupont cable from E45 to the POSITIVE 5V rail.
  4. Run a Dupont cable from E46 to F46.
  5. Run a Dupont cable from E47 to GPIO pin 17.
  6. Run a Dupont cable from E48 to any GND pin.
  7. Run a Dupont cable from E49 to GPIO pin 27.
  8. Run a Dupont cable from E54 (which is the D4 pin on the screen) to GPIO pin 5.
  9. Run a Dupont cable from E55 to GPIO pin 6.
  10. Run a Dupont cable from E56 to GPIO pin 13.
  11. Run a Dupont cable from E57 to GPIO pin 26.
  12. Run a Dupont cable from E58 to POSITIVE 5V rail.
  13. Run a Dupont cable from E59 to GND pin.

Wiring the potentiometer

  1. Run a Dupont cable from F45 to GND pin.
  2. Run a Dupont cable from F47 to POSITIVE 5V rail.
  3. Place the poteniometer so the three pins fall into G45, G46, and G47.

Wiring the LEDs

  1. Place the blue LED positive leg in I54 and the negative leg in I53.
  2. Place the red LED positive leg in G60 and the negative leg in G59
  3. Run a Dupont cable from F60 to GPIO pin 18.
  4. Place a 220Ω resistor on J59 to J55
  5. Run a Dupont cable from F55 to GND pin.
  6. Place a 220Ω resistor on G53 to G49
  7. Run a Dupont cable from J49 to GND pin.
  8. Run a Dupont cable from F54 to GPIO pin 23.

Wiring the buttons

  1. Place a 10kΩ resistor from POSITIVE 3.3V rail to B29.
  2. Place a 10kΩ resistor from POSITIVE 3.3V rail to B35.
  3. Place a 10kΩ resistor from POSITIVE 3.3V rail to B39.
  4. Place a red button so that the pins on the left side fall on D27 and D29.
  5. Place a green button so that the pins on the left side fall on D33 and D35.
  6. Place a blue button so that the pins on the left side fall on D39 and D41.
  7. Run a Dupont cable from H27 to GPIO pin 25.
  8. Run a Dupont cable from H29 to GND pin.
  9. Run a Dupont cable from H33 to GND pin.
  10. Run a Dupont cable from H35 to GPIO pin 24.
  11. Run a Dupont cable from H39 to GPIO pin 12.
  12. Run a Dupont cable from H41 to GND pin.

Congratulations, you’ve setup the entire device and should look something like this:

IoT Thermostat wired completely.