How to Use as7263: Examples, Pinouts, and Specs

The AS7263 is a 6-channel near-infrared spectral sensor manufactured by SparkFun, with the part ID NIR. This sensor provides digital measurements of light intensity for wavelengths between 610nm and 860nm. It is commonly used in applications such as material and liquid analysis, color matching, and spectral identification.

1. Power Supply: Connect the VCC pin to a 3.3V power supply and the GND pin to the ground.
2. I2C Communication: Connect the SDA pin to the SDA line of your microcontroller and the SCL pin to the SCL line.
3. Interrupt and Reset: Optionally, connect the INT pin to an interrupt-capable pin on your microcontroller and the RST pin to a digital output pin for reset functionality.

• Ensure that the power supply is stable and within the specified range (3.3V).
• Use appropriate pull-up resistors (typically 4.7kΩ) on the I2C lines if they are not already present on your microcontroller.
• Avoid exposing the sensor to direct sunlight or other strong light sources to prevent saturation.
• Calibrate the sensor in your specific application environment for accurate measurements.

#include <Wire.h>
#include "SparkFun_AS726X.h"

AS726X sensor;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  
  if (sensor.begin() == false) {
    Serial.println("AS7263 not detected. Check wiring.");
    while (1);
  }
  
  sensor.setMeasurementMode(2); // Set to 2 for continuous mode
  sensor.enableIndicator(); // Enable the indicator LED
}

void loop() {
  sensor.takeMeasurements();
  
  Serial.print("610nm: ");
  Serial.println(sensor.getCalibratedA());
  
  Serial.print("680nm: ");
  Serial.println(sensor.getCalibratedB());
  
  Serial.print("730nm: ");
  Serial.println(sensor.getCalibratedC());
  
  Serial.print("760nm: ");
  Serial.println(sensor.getCalibratedD());
  
  Serial.print("810nm: ");
  Serial.println(sensor.getCalibratedE());
  
  Serial.print("860nm: ");
  Serial.println(sensor.getCalibratedF());
  
  delay(1000); // Wait for 1 second before taking new measurements
}

1. Sensor Not Detected: Ensure that the I2C connections (SDA and SCL) are correctly made and that the sensor is powered with 3.3V.
2. Incorrect Readings: Verify that the sensor is not exposed to direct sunlight or other strong light sources. Calibrate the sensor in your specific environment.
3. No Data Output: Check the serial monitor settings (baud rate) and ensure that the sensor is properly initialized in the code.

• Check Connections: Double-check all wiring connections, especially the I2C lines.
• Power Supply: Ensure that the sensor is receiving a stable 3.3V power supply.
• Pull-up Resistors: Make sure that appropriate pull-up resistors are used on the I2C lines.
• Code Verification: Verify that the example code is correctly uploaded to the Arduino and that the serial monitor is set to the correct baud rate (9600 in this case).

By following this documentation, users should be able to effectively integrate and utilize the AS7263 near-infrared spectral sensor in their projects.