Wiring Diagram and Pin Reference
This page provides pin connections for the PMS5003 and SCD40 sensors on both Raspberry Pi and Arduino/ESP32 platforms.
Raspberry Pi GPIO Pinout for Both Sensors
PMS5003 on UART, SCD40 on I2C — check for pin conflicts before wiring.
Raspberry Pi GPIO Pinout for Both Sensors
PMS5003 connections on Raspberry Pi: - VCC → Pin 2 (5V) - GND → Pin 6 (Ground) - TX → Pin 10 (GPIO 15, UART RX) - RX → Pin 8 (GPIO 14, UART TX) SCD40 connections on Raspberry Pi: - VDD → Pin 1 (3.3V) - GND → Pin 9 (Ground) - SDA → Pin 3 (GPIO 2, I2C SDA) - SCL → Pin 5 (GPIO 3, I2C SCL) Enable I2C in raspi-config before use.
ESP32 Wiring
ESP32 has multiple I2C and UART interfaces — use GPIO 16/17 for UART.
ESP32 Wiring
PMS5003 connections on ESP32: - VCC → 5V (VIN pin if powered via USB) - GND → GND - TX → GPIO16 (RX2) - RX → GPIO17 (TX2) SCD40 connections on ESP32: - VDD → 3.3V - GND → GND - SDA → GPIO21 - SCL → GPIO22 Use Serial2 for PMS5003 and Wire for SCD40 in Arduino/ESP-IDF code.
Level Shifting for 5V Sensors on 3.3V Boards The Raspberry Pi and ESP32 use 3.3V logic. The PMS5003 outputs at 3.3V on its TX pin, which is safe. However, the PMS5003 RX pin expects 3.3V too — do not send 5V signals to it. A simple voltage divider (10k and 20k resistor) on the TX line from a 5V microcontroller to the sensor RX protects the sensor.