M5cam and BMP180

sheepDog

Hello,
I can read the pressure from BMP180 on a M5Stack and with Arduino.

I can compile the M5cam software, but if I compile with esp-idf a BMP180 example I got a problem.

I use this sample: https://github.com/krzychb/esp32-everest-run

I can compile it and M5cam logged on my wifi. Then it read
W (2116) Altimeter: Weather data retrieval initialized
... -> OK
For the BMP180 I got this error:
E (9184) BMP180: Sensor not found at 0x77
E (9189) Altimeter: BMP180 init failed with error = 196610

Is this a problem with the IO's?
I used sample used sensor pins sda/scl: 0x19/0x1b
Is this correct?

wschnell

This post is deleted!

sheepDog

Here is am small test program that worked with M5Stack-hardware. With M5cam-hardware it didn't work.

#include <Wire.h>
#include <Adafruit_BMP085.h>
Adafruit_BMP085 bmp;

void setup() {
  Serial.begin(115200);
  //Wire.begin();       //Default
  Wire.begin(25,23);  //M5cam SDA, SCL
  //Wire.begin(21,22);  //M5Stack SDA, SCL

  Serial.println("\nStart program");
  if (!bmp.begin()) {
     Serial.println("Could not find a valid BMP085 sensor, check wiring!");
	  while (1) {
             Serial.println("Could not find a BMP085 sensor!");
	     delay(2000);
	  }
   }
}
  
void loop() {
    Serial.print("Temperature = ");
    Serial.print(bmp.readTemperature());
    Serial.println(" *C");    
   //...
    delay(500);
}

sheepDog

The answer is:

    conf.sda_io_num = 13;
    conf.scl_io_num = 4;