YourCee PMS9103M | PM2.5 Laser Dust Sensor UART Module

YourCee PMS9103M PM2.5 Laser Dust Sensor Module – UART Particle Monitoring for Indoor Air Quality

The YourCee PMS9103M is a laser-scattering dust sensor module for measuring airborne particulate matter in indoor air-quality projects. It detects particles from 0.3um to 10um and reports concentration data up to 999ug/m3 with 1ug/m3 resolution, making it useful for air purifiers, fresh-air units, desktop air monitors, and environmental data loggers.

The module runs from a tightly regulated 5V supply and uses 3.3V TTL-level serial pins for communication. Its compact 48 x 40 x 12mm body and real-time response make it practical for embedded enclosures, while the SET and RESET pins support sleep and reset control. Pair it with a Raspberry Pi Pico W, an ELAB Nano V3, or a broader environmental sensor stack including the BME680 Sensor Board.

Because laser dust sensors rely on airflow and optical measurement, avoid blocking the inlet/outlet path and keep the module away from condensation, oil mist, and direct debris. Allow a short warm-up and use rolling averages when displaying AQI-style readings.

Technical Specifications

Board Layout & Label Guide

• VCC – 5V power input; keep within the listed 4.9V-5.1V range.
• GND – Power negative and signal reference.
• SET – Sleep control input; high or floating is normal operation, low is sleep.
• RXD – 3.3V TTL serial receive pin.
• TXD – 3.3V TTL serial transmit pin.
• RESET – Low-level reset input.
• Air Path – Keep inlet and outlet unobstructed for reliable particle sampling.
• Shielded Body – Six-sided shielding helps anti-interference performance.

Application Scenarios

1. Python UART Frame Logger

Read raw serial data from the PM sensor for protocol inspection.

import serialser = serial.Serial(“COM7″, 9600, timeout=1)while True: data = ser.read(32) if data: print(data.hex(” “))

2. Arduino UART Bridge

Forward module serial output to the USB serial monitor.

#include SoftwareSerial pmSerial(10, 11);void setup() { Serial.begin(115200); pmSerial.begin(9600);}void loop() { while (pmSerial.available()) { Serial.write(pmSerial.read()); }}

3. Sleep Control Test

Use the SET pin to switch between active and sleep modes.

const int setPin = 7;void setup() { pinMode(setPin, OUTPUT);}void loop() { digitalWrite(setPin, HIGH); delay(30000); digitalWrite(setPin, LOW); delay(30000);}

4. Raspberry Pi Serial Capture

Log raw particle frames for later parser development.

import serialimport timeser = serial.Serial(“/dev/ttyUSB0”, 9600, timeout=1)with open(“pm_log.hex”, “a”, encoding=”utf-8″) as log: while True: frame = ser.read(32) if frame: log.write(str(time.time()) + “,” + frame.hex() + “”) log.flush()

Packing List

• 1 x YourCee PMS9103M PM2.5 Laser Dust Sensor Module

FAQ

Q: What particles can it detect?
A: The listing specifies 0.3um to 10um particle detection.

Q: What voltage does it need?
A: Use a stable 5V supply within 4.9V to 5.1V.

Q: Are the UART pins 5V tolerant?
A: The listed IO level is 3.3V, so use level shifting if needed.

Q: Can it measure PM2.5?
A: Yes, it is intended for PM2.5 dust and particulate monitoring.

Q: Can it run in humid air?
A: Use it within 5%-80% RH and avoid condensation.

Q: What is SET for?
A: SET controls normal operation versus sleep mode.

Q: Why do readings fluctuate?
A: Particle distribution changes quickly; use averaging and stable airflow.

Q: Where should I mount it?
A: Keep the air path open and avoid dust clumps, water droplets, and direct fan turbulence.