Example Code for Arduino UNO-Multiple SCI Modules

Hardware Preparation

• DFRduino UNO R3 + Gravity: IO Expansion Shield x 1
• SCI DAQ Module x 1
• Supported sensors (e.g., SEN0334, SEN0514)
• Connection cables

Software Preparation

• Arduino IDE
• Download and install the .zip library DFRobot_RP2040_SCI Library. (About how to install the library?)
• Or search and install the DFRobot_RP2040_SCI library in the library manager

Wiring Diagram

Other Preparation Work

1. Set the ID of one SCI module to 0x22: Press "S" to enter settings, select "Set Board ID", choose 0x22, restart.
2. Connect both modules to Arduino UNO via I2C.

Sample Code

#include "DFRobot_RP2040_SCI.h"

DFRobot_RP2040_SCI_IIC SCI1(/*addr=*/0x21, &Wire);
DFRobot_RP2040_SCI_IIC SCI2(/*addr=*/0x22, &Wire);

void setup() {
  Serial.begin(115200);
  while(SCI1.begin() != 0){delay(1000);};
  while(SCI2.begin() != 0){delay(1000);};
}
void loop() {
  Serial.println(SCI1.getValue(SCI1.eALL,"Temp_Air"));
  Serial.println(SCI1.getValue(SCI1.eALL,"Humi_Air"));
  Serial.println(SCI1.getValue(SCI1.eALL,"Light"));
  Serial.println("-------------------");
  Serial.println(SCI2.getValue(SCI2.eALL,"AQI"));
  Serial.println(SCI2.getValue(SCI2.eALL,"TVOC"));
  Serial.println(SCI2.getValue(SCI2.eALL,"ECO2"));
  Serial.println(SCI2.getValue(SCI2.eALL,"Altitude"));
  Serial.println(SCI2.getValue(SCI2.eALL,"Pressure"));
  Serial.println("-------------------");
}

Result

• The serial monitor outputs data from both SCI modules (e.g., Temp_Air from SCI1, AQI from SCI2).

Additional Information

• Ensure each module has a unique ID (0x21, 0x22, 0x23) to avoid conflicts.