Arduino R4 WiFi printing on OLED accelerometer readings

[sergionegri]

Hello,

I got an R4 WiFi with Arduino Sensor Kit Base (sensors still attached, I simply plug the shield).

When you run the combo demo it freezes. I tried using different sensors independently and it works.

What it's failing is reading accelerometer and printing on OLED. It does work reading accelerometer and printing on serial though.

I even tried putting some crazy delay between reading the sensor and printing to OLED, to no avail.

I assume I am missing to set the appropriate addresses for each I2C device...but have no idea how to do it.

#include "Arduino_SensorKit.h"

float x = 0;

void setup() {
  
  Accelerometer.begin();

  delay(500);

  Oled.begin();
  Oled.setFlipMode(true);
  Oled.setFont(u8x8_font_amstrad_cpc_extended_r); 
}

void loop() {

  // Read sensor
  x = Accelerometer.readX();

  delay(500);

  Oled.setCursor(0, 0);
  Oled.print("X: ");
  Oled.print(x);
  Oled.print("   ");

  delay(500);

}

[sergionegri]

I even tried the following, bypassing standard accelerometer setup and manually setting the address (it works fine if I comment the OLED piece, but if I keep it it reads 0):

#include "Arduino_SensorKit.h"
#include "LIS3DHTR.h"
#include <Wire.h>
LIS3DHTR<TwoWire> LIS; //IIC
#define WIRE Wire

float x = 0;

void setup() {
  
  Serial.begin(9600);  // Initialize Serial for debugging
  while(!Serial);

  LIS.begin(WIRE, 0x19);
  delay(100);
  if (!LIS) {
    Serial.println("Accelerometer initialization failed");
  } else {
    Serial.println("Accelerometer initialized successfully");
    LIS.setOutputDataRate(LIS3DHTR_DATARATE_50HZ);
    LIS.setHighSolution(true); //High solution enable
  }


  if (!Oled.begin()) {
    Serial.println("OLED initialization failed");
  } else {
    Serial.println("OLED initialized successfully");
    
    Oled.setFlipMode(true);
    Oled.setFont(u8x8_font_amstrad_cpc_extended_r); 
  }
}


void loop() {
  // Read sensor
  x = LIS.getAccelerationX();

  Oled.setCursor(0, 0);
  Oled.print("X: ");
  Oled.print(x);
  Oled.print("   ");
}

[sergionegri]

I tried running an i2c scanner. Found that the addresses are the following:
0x19
0x38
0x3C
0x77

I therefore tried using the other library for the OLED, and draw a line with a point depending on the accelerometer value. I selected this low level implementation because it allows me to manually set i2c address. I tried to set in turn all addresses above, and even some random ones, to no avail. The line is drawn, but the accelerometer value read is always 0 (as in other failed experiments)

#include <Arduino.h>
#include "Arduino_SensorKit.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_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);   // All Boards without Reset of the Display

void setup(void) {
  u8g2.setI2CAddress(0x77); // trying to set an address to avoid conflict
  u8g2.begin();
  Accelerometer.begin();
}

void loop(void) {
  u8g2.clearBuffer();
  u8g2.drawLine(Accelerometer.readX()*100, 10, 40, 55);
  u8g2.sendBuffer();

  delay(100);
}

[sergionegri]

Solved. There was no error in my code. Apparently the last library of arduino sensor 1.0.10 is bugged. Reverting to 1.0.8 made the trick.