ESP32S3 I2C not working

Projects Programming
1

I have an ESP32S3 that I want to use INA226 but with the code below ,but it's not detecting anything on the I2C, Now if I upload the exact same code to an ESP32 it shows that the INA226 is connected with the address of 0x51.
I have pull up resistors connect the SDA,SCL lines and I have also tried another 2 ESP32S3 and they do the same by not detecting anything

#include "Wire.h"
//#include <Wire.h>
#define I2C_SDA 4
#define I2C_SCL 5
void setup() {
  Serial.begin(115200);
  Wire.setPins(I2C_SDA,I2C_SCL);
  Wire.begin(I2C_SDA, I2C_SCL);
}

void loop() {
  byte error, address;
  int nDevices = 0;

  delay(5000);

  Serial.println("Scanning for I2C devices ...");
 
  for(address = 0x01; address < 0x7f; address++){
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0){
      Serial.printf("I2C device2 found at address 0x%02X\n", address);
    
      nDevices++;
    } else if(error != 2){
      Serial.printf("Error %d at address 0x%02X\n", error, address);
   
    }
  }
  if (nDevices == 0){
    Serial.println("No I2C devices found");
   }
}

I've tried a few way but no joy
Thanks

2

Have you checked your ESP32S3 data sheet or schematic to verify that your SCL and SDA pins are specified correctly?

Don

3

running the following program in an ESP32-S3-DevKitC-1

#include <Wire.h>
#include <i2cdetect.h>

#define I2C_SDA 4
#define I2C_SCL 5

void setup() {
  Wire.begin(I2C_SDA, I2C_SCL);
  //Wire.begin();
  Serial.begin(115200);
  Serial.println("i2cdetect example\n");
  Serial.print("Scanning address range 0x03-0x77\n\n");
  
}

void loop() {
  i2cdetect();
  delay(2000);
}

it displays

14:56:18.243 ->      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
14:56:18.243 -> 00:          -- -- -- -- -- -- -- -- -- -- -- -- --
14:56:18.275 -> 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
14:56:18.275 -> 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
14:56:18.275 -> 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
14:56:18.275 -> 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
14:56:18.275 -> 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
14:56:18.275 -> 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
14:56:18.275 -> 70: -- -- -- -- -- -- 76 --

detecting a Pololu TOF sensor on address 0x76

if I run your program of post 1 I get

14:58:47.080 -> Scanning for I2C devices ...
14:58:47.080 -> I2C device2 found at address 0x76
1 Like
4

Why make it hard if you can make it easy.
Start with simple basic code that everyone uses.

// Forum: https://forum.arduino.cc/t/esp32s3-i2c-not-working/1244885
// This Wokwi project: https://wokwi.com/projects/394517050165987329

#include <Wire.h>

void setup() 
{
  Serial.begin(115200);
  Wire.begin();  // default SDA = 8, SCL = 9
}

void loop() 
{
  Serial.print("Scan: ");
 
  for(int address = 1; address < 128; address++)
  {
    Wire.beginTransmission(address);
    int error = Wire.endTransmission();
    if (error == 0)
    {
      Serial.printf("0x%02X ", address);
    }
  }
  Serial.println();

  delay(2000);
}

Try it in Wokwi simulation:

5

Thanks guy's from your comments I have now got it working, I stupidly connected the SCL to a wrong pin on the eps32s3, I connected it to D6 the last port instead of D5(GPI06) but I thought I'd double checked that and had each SP32S3 on separate bread boards guess the more you look the more confused I got and got myself lost in thinking it was working when I used it my ready made PCB (which I left at work)

Thanks Koepel I've not seen or heard of that

1 Like
6

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