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sparkfun / SparkFun_SCD30_Arduino_Library

An Arduino library for the SCD30 NDIR CO2 sensor.
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readRegister always returns 0 #6

Closed tayRpi closed 4 years ago

tayRpi commented 5 years ago

I have a SCD30 sensor, however dataAvailable() is always false.

I debugged this: dataAvailable() calls uint16_t SCD30::readRegister(uint16_t registerAddress), which has the following strange behaviour: When calling the function, _i2cPort->available() is 2, so the msb and lsb are assembled and returned:

    uint8_t msb = _i2cPort->read();
    uint8_t lsb = _i2cPort->read();
    return ((uint16_t)msb << 8 | lsb);

The returned value is 0. Any idea what is wrong?

bobobo1618 commented 5 years ago

This indicates that the sensor is functioning and responding correctly but doesn't have any data available for you to read.

Can you post your full code somewhere? Have you called begin() somewhere in your code's setup?

nseidle commented 4 years ago

Closing due to inactivity. If you still have problems please consider giving us more info: What platform are you using? Can you post the code to replicate the problem?