ATOM Lite and ENV.II

regres

Hello,

I'm trying to get the working with ENV.II unit using modified sample code from https://github.com/m5stack/M5-ProductExampleCodes/blob/master/Unit/ENVII/Arduino/ENVII/ENVII.ino but I keep getting the "Could not find a valid BMP280 sensor, check wiring!" error.

I've got the ENV.II working with M5Stack Core, but can't figure out the ATOM Lite.

The code is as follows:

#include "M5Atom.h"
#include <Wire.h>
#include "Adafruit_Sensor.h"
#include <Adafruit_BMP280.h>
#include "SHT3X.h"
SHT3X sht30;
Adafruit_BMP280 bme;

float tmp = 0.0;
float hum = 0.0;
float pressure = 0.0;

void setup()
{
  M5.begin(true, true, true);
  Wire.begin();
  Serial.println(F("ENV Unit(SHT30 and BMP280) test..."));
  while (!bme.begin(0x76))
  {
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
  }
}

void loop() {
  pressure = bme.readPressure();
  if(sht30.get()==0){
    tmp = sht30.cTemp;
    hum = sht30.humidity;
  }
  Serial.printf("Temperature: %2.2f*C  Humidity: %0.2f%%  Pressure: %0.2fPa\r\n", tmp, hum, pressure);

  delay(100);

}

Any suggestions would be appreciated,
Thank you

felmue

Hi @regres

the Groove connector on M5Atom Lite uses GPIO26 and GPIO32 as SDA and SDL. Try this:

  M5.begin(true, false, true);
  Wire.begin(26, 32);

Note: second parameter to M5.begin() set to false to disable default I2C initialisation (which uses different GPIOs). Then initialise I2C with desired GPIOs.

Thanks
Felix

regres

Hi @felmue

Thank you for the advice, the Wire.begin(26, 32) is what I was missing.
I tired M5.begin(true, false, true) before but, by itself, it didn't make any difference.

Looks like explicitly specifying I2C pins is the way to go.

Again, thank you
regres

gavin67890

I have tried using code above and similar from M5Stack repo. I changed the pin assignments to 19 and 22, which works fine on an alt. setup with Atom Lite, Env I hat, and Atom Mate.

Using the setup below:
Atom Matrix
Env II hat
Atom Mate

I get this error and continuous reset loop.

[ 913][W][Wire.cpp:301] begin(): Bus already started in Master Mode.
Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.

If I pull out the hat, I get a warning via the code that it is disconnected. I know the origin of this post was from long ago, but I can't think what could be causing it. Is there any difference between Env II unit and Env II hat? Any other thoughts welcome.