Seeduino XIAO, Serial monitor, expansion board OLED and AS7262

Products & Technology
#1

Hi,
first time here.
I am using a seeeduino XIAO on the expansion board (Seeeduino XIAO Expansion board - Seeed Wiki), using Arduino IDE to upload the program on mac.
I connected a AS7262 color sensor in I2C and I get the data in the OLED but… I need to have the serial monitor open in the notebook to see the data in the OLED, if not, OLED is black, Any idea?


#include <Arduino.h>
#include <U8g2lib.h>
 
#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif
 
 
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);  // High speed I2C
 
// U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);    //Low spped I2C
 
#include "Adafruit_AS726x.h"

//create the object
 Adafruit_AS726x ams;

//buffer to hold raw values
uint16_t sensorValues[AS726x_NUM_CHANNELS];

//buffer to hold calibrated values (not used by default in this example)
//float calibratedValues[AS726x_NUM_CHANNELS];

void setup() {

  u8g2.begin();
  
  Serial.begin(9600);
  while(!Serial);
  
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  //begin and make sure we can talk to the sensor
  if(!ams.begin()){
    Serial.println("could not connect to sensor! Please check your wiring.");
    while(1);
  }
}

void loop() {

  //read the device temperature
//  uint8_t temp = ams.readTemperature();
  
  //ams.drvOn(); //uncomment this if you want to use the driver LED for readings
  ams.startMeasurement(); //begin a measurement
  
  //wait till data is available
  bool rdy = false;
  while(!rdy){
    delay(5);
    rdy = ams.dataReady();
  }
  //ams.drvOff(); //uncomment this if you want to use the driver LED for readings

  //read the values!
  ams.readRawValues(sensorValues);
  //ams.readCalibratedValues(calibratedValues);

//  Serial.print("Temp: "); Serial.print(temp);
//  Serial.print(" Violet: "); Serial.print(sensorValues[AS726x_VIOLET]);
//  Serial.print(" Blue: "); Serial.print(sensorValues[AS726x_BLUE]);
//  Serial.print(" Green: "); Serial.print(sensorValues[AS726x_GREEN]);
//  Serial.print(" Yellow: "); Serial.print(sensorValues[AS726x_YELLOW]);
//  Serial.print(" Orange: "); Serial.print(sensorValues[AS726x_ORANGE]);
//  Serial.print(" Red: "); Serial.print(sensorValues[AS726x_RED]);
//  Serial.println();
//  Serial.println();

  u8g2.clearBuffer();                   // clear the internal memory
  u8g2.setFont(u8g2_font_amstrad_cpc_extended_8f);   // choose a suitable font
  u8g2.setCursor(0,10);    // write something to the internal memory
  u8g2.print(sensorValues[AS726x_ORANGE], DEC);
  u8g2.sendBuffer();                    // transfer internal memory to the display
  delay(1000);  
  
}```
Best