humidity-temperature-sensor

A raspberry pi 0 2 w humidity and temperature sensor

• Raspberry Pi 0 2 W
• HiLetgo DHT22/AM23 (ASAIR AM2302)
• Raspberry Pi Tutorial: How to Use the DHT-22
• onoff

dev environment

1. install docker desktop
2. on windows, setup WSL 2, install ubuntu 22 LTS and integrate that with docker desktop
3. clone the repository (clone into the ubuntu 22 if on windows)
4. run ./devcontainer.sh

pi setup

Installing the OS

1. install imager
2. select the Raspberry Pi OS (64-bit) image
3. click edit settings
   1. set hostname: rpi20w
   2. username: alpha
   3. password
   4. WLAN: asus 2G
   5. locale
   6. enable the SSH service: rpi20w.local

References

• https://www.raspberrypi.com/documentation/computers/remote-access.html#ssh
• https://www.raspberrypi.com/documentation/computers/getting-started.html#raspberry-pi-imager

Setting up the web server

1. SSH into the pi
2. run sudo apt update and sudo apt upgrade
3. run sudo apt install apache2 -y
4. verify by navigating to http://rpi20w.local/

References

• https://www.raspberrypi.com/documentation/computers/remote-access.html#set-up-an-apache-web-server

Installing Node.js

1. SSH into the pi
2. run curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
3. run nvm install 16

Using the LTS v16 here because onoff only supports v16.

Connecting the sensor

1. connect the left pin (i.e. +) to pin 1 for 3,3V of power
2. connect the middle pin (i.e. out) to pin 3 for data
3. connect the right pin (i.e. -) to pin 6 for ground

raspberry pi 0 2 spec

sensor spec

Datasheet