no I2C

[jo-ei]

Hello everyone, I have been trying for days now to address an RTC clock in order to have the time locally after retrieval via LORA.

With the original lib from heltec and the arduino environment it works and I see the address with the I2C scanner. With this lib it does not work and I always see only

SDA on PIN: 41 SCL on PIN: 42 Scanning I2C Addresses Channel 1 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. Scan Completed, 0 I2C Devices found.

is there a special way with this lib?

I have tried many things, here is the latest version of my test code:

#define SDA 41
#define SCL 42

void setup() {
  heltec_setup();
    Wire.begin(SDA, SCL);

  Serial.print("SDA on PIN: ");
  Serial.println(SDA);
  Serial.print("SCL on PIN: ");
  Serial.println(SCL);
}

void loop() {

  Serial.println("Scanning I2C Addresses Channel 1");
  uint8_t cnt=0;
  for(uint8_t i=0;i<128;i++){
    Wire.beginTransmission(i);
    uint8_t ec=Wire.endTransmission(true);
    if(ec==0){
      if(i<16)Serial.print('0');
      Serial.print(i,HEX);
      cnt++;
    }
    else Serial.print("..");
    Serial.print(' ');
    if ((i&0x0f)==0x0f)Serial.println();
    }
  Serial.print("Scan Completed, ");
  Serial.print(cnt);
  Serial.println(" I2C Devices found.");

delay(20000);

}

since i see the clock module with the other code, the wiring must be correct

can you give me a hint what i might be doing wrong?

Thanks

[ropg]

I’ll try to have a look at this later this week.

[jo-ei]

hi, any news about the bug? was it possible to reproduce?

[ropg]

Hello there! I have been operated on my shoulder, and need to have my arm in a sling for another month. So doing anything with electronics and lots of wires is a lot harder now than I would like it to be. Two thoughts:

• Why not use the RTC in the ESP32? Does that need an extra crystal? (haven't used it with this board)
• Try putting #define HELTEC_NO_DISPLAY as first line to see if the I2C to display interferes.

Good luck!

[jo-ei]

Hi ropg, first of all, get well soon for your shoulder.

Unfortunately, the internal RTC does not continue to run during deep sleep and I don't want to get the times via LoRa every time unnecessarily. (or am I doing something wrong and there is a way to get the time even in deep sleep)

I have the light version without display.

I still set the option for testing and couldn't see any improvement. Is there anything else I can do to provide more information?

Thank you