Build Instructions

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• 1

  Hardware Build

  Step 1: Print enclosure, solder headers and DHT 22 sensor onto PCB, connect OLED screen and assemble sensor.

  # Parts List 

  *3D printed enclosure (https://www.thingiverse.com/thing:2539897) 

  *OLED screen (http://amzn.to/2xR4iQP) 

  *NodeMCU breakout board (https://goo.gl/U2fY7y) 

  *NodeMCU ESP8266 dev board v0.9 (http://amzn.to/2hd6RJk) or 1.0 (http://amzn.to/2ymAkak). 

  *DHT-22 sensor (http://amzn.to/2ymmODK) 

  *headers (http://amzn.to/2fNe81C) 

  *solid hook-up wire, 22awg (https://amzn.to/2voliAb)

  # Build Procedure

  Initial Build

  1. Print enclosure and cover
  2. Solder left/right inner headers onto the OSHPark carrier board (15 pins each)
  3. Solder DHT22 sensor onto board, with openings facing out
  4. Stick NodeMCU board onto carrier board, USB connector facing opposite from DHT22
  5. De-pin OLED screen (cut the black plastic holding pins together, remove pins one by one) <- alternatively, you can use breadboard wires (http://amzn.to/2fDGqeJ) with connectors on each end if you don't want to de-pin, but you'll have to bend the OLED screen pins to the side.
  6. Cut seven (7) short (~2 inch) lengths of hook-up wire and strip on each end.
  7. Connect/solder OLED screen to carrier board as follows:

  For SPI OLED:

  Board	Wire Color	OLED
  3v3	Red	VCC
  Gnd	Black	Gnd
  D10	Orange	Res
  D9	Gray	DC
  D8	White	CS
  D7	Yellow	D1
  D5	Brown	D0

  For I2C OLED:

  Board	Wire Color	OLED
  3v3	Red	VCC
  Gnd	Black	Gnd
  D10	Blue	SCL
  D9	Green	SDA

  # Final Assembly:

  1. Stick OLED screen onto mounting posts (ensuring the screen is within the enclosure opening) and use a soldering iron to melt the posts over it.

  2. Put NodeMCU carrier board in, ensuring it fits snugly (DHT sensor is tightly within its opening, USB connector is visible)

  3. Put enclosure cover on, and secure with small screws (or glue in place)

• 2

  Programming

  Step 2: Program sensor with Arduino code, configuring Wifi/MQTT and other configuration settings.
• 3

  Configuration

  Step 3: Test MQTT connection/data output, configure openHAB for sensor data input and charting, and calibrate sensor to HVAC thermostat.

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