BoardPilotSGP40 VOC sensor with ESP32
Supply 3.3-5 V
Bus I2C
I2C address
0x59
Measures voc
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VIN | Power | 3V3 | |
| 3VO | Not wired to the ESP32 | — | 3.3 V output of the on-board regulator. Leave unconnected |
| GND | Ground | GND | |
| SCL | I2C clock (SCL) | D22 | |
| SDA | I2C data (SDA) | D21 |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Starter code (Arduino)
#include <Wire.h>
void setup() {
Serial.begin(115200);
Wire.begin(21, 22); // SDA = GPIO 21, SCL = GPIO 22
Wire.beginTransmission(0x59);
bool found = Wire.endTransmission() == 0;
Serial.println(found ? "SGP40 VOC sensor found at 0x59" : "Not found: check power, GND and SDA/SCL");
}
void loop() {}Sources
- Sensirion SGP40 datasheet, I2C address 0x59; chip supply 1.7 to 3.6 V
- Sensirion SGP40 datasheet, Gives a raw signal; the VOC index needs Sensirion’s gas index algorithm
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.