Hello @Balta
I think you missed enabling Serial on your M5Atom. Try including:
#include <M5Atom.h>
then in setup() enable Serial and disable I2C to have GPIO25 and GPIO21 freed up for use with OneWire:
// Enable Serial, disable I2C, enable Display
M5.begin(true, false, true);
and I would add some delay in your loop():
delay(1000);
BTW: In my M5Atom setup I've verified all available GPIOs (19, 22, 23, 33, 21 and 25) successfully to work with OneWire.
Good luck
Felix
For reference - full code using GPIO25:
#include <M5Atom.h>
#include <OneWire.h>
#include <DallasTemperature.h>
// GPIO where the DS18B20 is connected to
const uint8_t oneWireBus = GPIO_NUM_25;
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);
// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);
float DS18B20_temperature = -100.0;
void setup() {
// Enable Serial, disable I2C, enable Display
M5.begin(true, false, true);
sensors.begin();
}
void loop() {
sensors.requestTemperatures();
const float temperature = sensors.getTempCByIndex(0);
Serial.println(temperature);
delay(1000);
}
