jarzebski / arduino-ina226 Goto Github PK

Hi.. I have a problem to use 2 module INA226 with protocol I2C.
I write this sketch but it doesn't work. the Arduino IDE give me errors. Can you help me?

`/*
INA226 Bi-directional Current/Power Monitor. Simple Example.
Read more: http://www.jarzebski.pl/arduino/czujniki-i-sensory/cyfrowy-czujnik-pradu-mocy-ina226.html
GIT: https://github.com/jarzebski/Arduino-INA226
Web: http://www.jarzebski.pl
(c) 2014 by Korneliusz Jarzebski
*/

#include <Wire.h>
#include <INA226.h>

INA226 ina_5V;
INA226 ina_3.3V(0x45);

void checkConfig()
{

Serial.print("Max possible current 5V: ");
Serial.print(ina_5V.getMaxPossibleCurrent());
Serial.println(" A");

Serial.print("Max current 5V: ");
Serial.print(ina_5V.getMaxCurrent());
Serial.println(" A");

Serial.print("Max shunt voltage 5V: ");
Serial.print(ina_5V.getMaxShuntVoltage());
Serial.println(" V");

Serial.print("Max power 5V: ");
Serial.print(ina_5V.getMaxPower());
Serial.println(" W");

Serial.print("Max possible current 3.3V: ");
Serial.print(ina_3.3V.getMaxPossibleCurrent());
Serial.println(" A");

Serial.print("Max current 3.3V: ");
Serial.print(ina_3.3V.getMaxCurrent());
Serial.println(" A");

Serial.print("Max shunt voltage 3.3V: ");
Serial.print(ina_3.3V.getMaxShuntVoltage());
Serial.println(" V");

Serial.print("Max power 3.3V: ");
Serial.print(ina_3.3V.getMaxPower());
Serial.println(" W");

}

void setup()
{
Serial.begin(115200);

Serial.println("Initialize INA226");
Serial.println("-----------------------------------------------");

// Default INA226 address is 0x40
ina_5V.begin();
ina_3.3V.begin();

// Configure INA226
ina_5V.configure(INA226_AVERAGES_1, INA226_BUS_CONV_TIME_1100US, INA226_SHUNT_CONV_TIME_1100US, INA226_MODE_SHUNT_BUS_CONT);
ina_3.3V.configure(INA226_AVERAGES_1, INA226_BUS_CONV_TIME_1100US, INA226_SHUNT_CONV_TIME_1100US, INA226_MODE_SHUNT_BUS_CONT);

// Calibrate INA226. Rshunt = 0.1 ohm, Max excepted current = 4A
ina_5V.calibrate(0.1, 4);
ina_3.3V.calibrate(0.1, 4);

// Display configuration
checkConfig();

Serial.println("-----------------------------------------------");
}

void loop()
{
Serial.print("Bus voltage 5V: ");
Serial.print(ina_5V.readBusVoltage(), 2); // valore a 2 cifre decimali
Serial.println(" V");

Serial.print("Bus power 5V: ");
Serial.print(ina_5V.readBusPower(), 3); // valore a 3 cifre decimali
Serial.println(" W");

Serial.print("Shunt voltage 5V: ");
Serial.print(ina_5V.readShuntVoltage(), 5);
Serial.println(" V");

Serial.print("Shunt current 5V: ");
Serial.print(ina_5V.readShuntCurrent(), 4); // valore a 3 cifre decimali
Serial.println(" A");

Serial.print("Bus voltage 3.3V: ");
Serial.print(ina_3.3V.readBusVoltage(), 2); // valore a 2 cifre decimali
Serial.println(" V");

Serial.print("Bus power 3.3V: ");
Serial.print(ina_3.3V.readBusPower(), 3); // valore a 3 cifre decimali
Serial.println(" W");

Serial.print("Shunt voltage 3.3V: ");
Serial.print(ina_3.3V.readShuntVoltage(), 5);
Serial.println(" V");

Serial.print("Shunt current 3.3V: ");
Serial.print(ina_3.3V.readShuntCurrent(), 4); // valore a 3 cifre decimali
Serial.println(" A");

Serial.println("");
delay(1000);
}`

I have proposed some changes to the function:

void INA226::setShuntVoltageLimit(float voltage){// MODIFIED by GCAR
uint16_t value = voltage/2.5e-6;
writeRegister16(INA226_REG_ALERTLIMIT, value);
}

getMaskEnable should be public to give access to CNVR flag to coordinate value reading

Could you change lisence to MIT. GPL requires that also my code has to be under GPL, what it never will be. I changed my NMEA2000 library to MIT so that it can be used freely.

INA226 example code seems to work on ProMini hardware but not on the Bluefruit NRF52.

I have confirmed my Bluefruit NRF52 i2c functionality using a TMP100 sensor.

Any ideas?

Andy

Wire.requestFrom(...) should not be encapsulated by a Transmission.
The begin/end Transmission is only needed for sending data to a I²C slave by send().
https://playground.arduino.cc/Main/WireLibraryDetailedReference#beginTransmission

while(!Wire.available()) {};
is also not needed. When Wire.requestFrom() has returned the I2C transmission has ended and the data is in the buffer.

To get the maximum accuracy for Current and Power, the following equation should be used.
Current_LSB = (float)((Maximum Expected Current)/(2^15))

I used it to measure 4 to 20mA current with this and I was able to achieve the accuracy of +/-2 uA which when compared to the readings on Fluke 787B.

Hello,

Thanks for this nice library. I see functions to set the limit alerts but no function to turn off alerts. Is this on purpose? Otherwise I would create at least one function to disable all alerts or all the individual functions to disable alerts.

There is a blocking wait for one millisecond, that results in a maximal sampel frequency lower than 1kHz.

Line 307 has a semicolon
#endif;
This leads to a warning