jarzebski/arduino-ina219

INA219 Zero-Drift, Bi-directional Current/Power Monitor Arduino Library

arduino-ina219's Issues

No need to wait after Wire.requestFrom() and no Wire.beginTransmission() or endTransmission() should be used with Wire.requestFrom().

When the Wire.requestFrom() returns, the I2C transaction has completely finished and the received data is waiting in a buffer in the Wire library. There is nothing to wait for after the Wire.requestFrom(). The Wire.available() and Wire.read() only use that buffer, they are not involved in the I2C bus transaction.
The while-loop to wait for something can be removed.

The Wire.beginTransmission() and Wire.endTransmission() are only used when writing data. They should not be used with Wire.requestFrom().

Bus voltage needs to be unsigned.

The value stored in the Bus Voltage register are unsigned, so the bits should be written into an unsigned uint16_t instead of an int16_t value before doing the scaling math and returning a float. Otherwise it will be treated as two's complement, and any bus voltage over about 16 volts will return a negative number.

This would fix it:

float INA219::readBusVoltage(void)
{
    uint16_t voltage;

    voltage = readRegister16(INA219_REG_BUSVOLTAGE);
    voltage >>= 3;

    return (voltage * 0.004);

Add support for Arduino with STM32

Please add support for Arduino framework for STM32 chips.
I can confirm that it works for me after minor changes. Maybe I'll even make a pull request later, when I have some spare time.

Johnny Five Plugin

What would it take to port this over to to work in the Johnny Five environment? (https://github.com/rwaldron/johnny-five) (http://johnny-five.io/)