PMS7003 + DHT21 Air Quality Monitor with 3.5 inch TFT Display (Arduino UNO)

This project is an open-source air quality monitor featuring two highly reliable sensors:

PMS7003 – Laser-based particle sensor for measuring PM1.0, PM2.5, and PM10 levels with high accuracy.

DHT21 – Digital temperature and humidity sensor with stable long-term performance.

Data is displayed in real-time on a 3.5" TFT LCD using the MCUFRIEND_kbv library.
I am sharing this as open-source to allow others to easily replicate, improve, and adapt it for their own needs.

In the future, I will provide AliExpress purchase links for all required components.
The Arduino source code will be included as an .ino file for direct upload.

 

3.5" TFT LCD Blue =>

https://buly.kr/28tqTbN

pms7003 =>

https://buly.kr/HSXlocN

dht21=>

https://buly.kr/7QMZu8C

arduino uno R3 and cable=>

https://buly.kr/44yBGeo

Optional Instructions

For Arduino UNO power supply, choose either a USB-A type or USB-C type cable, cut it, and solder the positive wire directly to the VCC pin of the UNO.

Connect all sensor power wires to 5V and GND.

For the remaining wiring, you can ask GPT to interpret the provided code to identify the pin assignments and connections.