Example Code for Arduino-Get Sensor Data

Hardware Preparation

• DFRduino UNO+IO Expansion Board (SKU:DFR0216-2) ×1
• Gravity: SFA40 HCHO Sensor（SKU:SEN0661）×1
• Gravity Sensor Cable(Comes with Gravity: SFA40 HCHO Sensor)

The yellow vent membrane on the SFA40 sensor must not come into contact with organic solvents or be scratched by sharp objects.

Software Preparation

• Download Arduino IDE： Click to download Arduino IDE
• Download DFRobot_SFA40 library：DFRobot SFA40
• Arduino IDE V1.8.19 (or below) can extract the .zip library downloaded from GitHub into the “libraries” folder located in the Arduino IDE installation directory.
• Arduino IDE V2.0.0 (or above) can directly search for the "DFRobot_SFA40" library in the Library Manager and install it.

Wiring Diagram

Sample Code

/*!
 * @file getSensorData.ino
 * @brief This example shows how to obtain data collected by SFA40, including HCHO and temperature and humidity data
 * @copyright	Copyright (c) 2025 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license The MIT License (MIT)
 * @author [fary]([email protected])
 * @version V1.0
 * @date 2025-04-08
 * @url https://github.com/DFRobot/DFRobot_SFA40
 */
#include "DFRobot_SFA40.h"
DFRobot_SFA40 SFA40;

void setup() {
	Serial.begin(115200);
	while(!Serial);
	Serial.print("SFA40 init...");
	while(SFA40.begin()!=0){
		Serial.print("failed,Not found SFA40!");
	}
	Serial.println("successed");
	SFA40.startMeasurement();
}
  
void loop() {
	uint8_t status = SFA40.readMeasurementData();
	if(status==0){
		Serial.println("The sensor is ready and the data is reliable! ");
		static int number=0;

		Serial.print("TemperatureC: ");
		Serial.print(SFA40.temperatureC);
		Serial.println(" C");

		Serial.print("TemperatureF:");
		Serial.print(SFA40.temperatureF);
		Serial.println(" F");
	
		Serial.print("humidity:");
		Serial.print(SFA40.humidity);
		Serial.println(" %RH");
	
		Serial.print("HOCO:");
		Serial.print(SFA40.HOCO);
		Serial.println(" ppb");	
		
	}else if(status&0x01){
		Serial.println("The sensor is not ready!");
	}else if(status&0x02){
		Serial.println("Sensor is not up to specification!");
	}

	 delay(1000);
}

Result

Upload the following code and open Serial monitor to check the output.