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Merge pull request #7 from SV-Zanshin/Multiple-Devices
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Version 1.0.5 completed and tested with only 1 device, will complete multiple devices once hardware arrives, but the library is backward compatible so can be published
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@SV-Zanshin
SV-Zanshin authored Sep 24, 2017
2 parents 373ac6a + 91fd72a commit 6a40cfb
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62 changes: 41 additions & 21 deletions Examples/DisplayReadings/DisplayReadings.ino
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Expand Up @@ -11,6 +11,13 @@
** only to convert and display the data conveniently. The INA226 uses 15 bits of precision, and even though the **
** current and watt information is returned using 32-bit integers the precision remains the same. **
** **
** As of version 1.0.3 the library supports multiple INA226 devices. The Atmel's EEPROM is used to store the 96 **
** bytes of static information per device using https://www.arduino.cc/en/Reference/EEPROM function calls. **
** Although up to 16 devices could theoretically be present on the I2C bus the actual limit is determined by the **
** available EEPROM - ATmega328 UNO has 1024k so can support up to 10 devices but the ATmega168 only has 512 bytes**
** which limits it to supporting at most 5 INA226s. The library has been modified to be backwards compatible and **
** the device number (from 0 to number of devices found) is passed as the last parameter. **
** **
** The datasheet for the INA226 can be found at http://www.ti.com/lit/ds/symlink/ina226.pdf and it contains the **
** information required in order to hook up the device. Unfortunately it comes as a VSSOP package but it can be **
** soldered onto a breakout board for breadboard use. The INA226 is quite similar to the INA219 mentioned above, **
Expand All @@ -27,9 +34,10 @@
** **
** Vers. Date Developer Comments **
** ====== ========== ============================= ============================================================== **
** 1.0.2 2017-08-09 https://github.com/SV-Zanshin Cosmetic changes **
** 1.0.1 2017-01-12 https://github.com/SV-Zanshin Minor code cleanup and added more comments **
** 1.0.0 2017-01-09 https://github.com/SV-Zanshin Cloned example from test program suite **
** 1.0.3 2017-09-18 https://github.com/SV-Zanshin https://github.com/SV-Zanshin/INA226/issues/6 Multiple INA226s **
** 1.0.2 2017-08-09 https://github.com/SV-Zanshin Cosmetic changes **
** 1.0.1 2017-01-12 https://github.com/SV-Zanshin Minor code cleanup and added more comments **
** 1.0.0 2017-01-09 https://github.com/SV-Zanshin Cloned example from test program suite **
** **
*******************************************************************************************************************/
#include <INA226.h> // INA226 Library //
Expand All @@ -41,6 +49,7 @@ const uint32_t SERIAL_SPEED = 115200; //
** Declare global variables and instantiate classes **
*******************************************************************************************************************/
INA226_Class INA226; // INA class instantiation //
uint8_t devicesFound = 0; // Number of INA226s found //
/*******************************************************************************************************************
** Declare prototypes for all functions used **
*******************************************************************************************************************/
Expand All @@ -56,31 +65,42 @@ void setup() { //
#ifdef __AVR_ATmega32U4__ // If we are a 32U4 processor, then //
delay(2000); // wait 2 seconds for the serial //
#endif // interface to initialize //
Serial.print(F("\n\nDisplay INA226 Readings V1.0.1\n")); // Display program information //
// The begin initialized the calibration for an expected �1 Amps maximum current and for a 0.1Ohm resistor //
INA226.begin(1,100000); // //
Serial.print(F("\n\nDisplay INA226 Readings V1.0.3\n")); // Display program information //
// The begin initializes the calibration for an expected �1 Amps maximum current and for a 0.1Ohm resistor, and //
// since no specific device is given as the 3rd parameter all devices are initially set to these values //
devicesFound = INA226.begin(1,100000); // Set expected Amps and resistor //
Serial.print(F("Detected ")); // //
Serial.print(devicesFound); // //
Serial.println(F(" INA226 devices on I2C bus")); // //
INA226.setAveraging(4); // Average each reading n-times //
INA226.setBusConversion(); // Maximum conversion time 8.244ms //
INA226.setShuntConversion(); // Maximum conversion time 8.244ms //
INA226.setBusConversion(7); // Maximum conversion time 8.244ms //
INA226.setShuntConversion(7); // Maximum conversion time 8.244ms //
INA226.setMode(INA_MODE_CONTINUOUS_BOTH); // Bus/shunt measured continuously //
} // of method setup() // //
/*******************************************************************************************************************
** This is the main program for the Arduino IDE, it is called in an infinite loop. The INA226 measurements are **
** run in a simple infinite loop **
*******************************************************************************************************************/
void loop() { // Main program loop //
Serial.print(F("Bus voltage: ")); // //
Serial.print((float)INA226.getBusMilliVolts()/1000.0,4); // Convert to millivolts //
Serial.println(F("V")); // //
Serial.print(F("Shunt voltage: ")); // //
Serial.print((float)INA226.getShuntMicroVolts()/1000.0,3); // Convert to millivolts //
Serial.println(F("mV")); // //
Serial.print(F("Bus amperage: ")); // //
Serial.print((float)INA226.getBusMicroAmps()/1000.0,3); // Convert to milliamps //
Serial.println(F("mA")); // //
Serial.print(F("Bus wattage: ")); // //
Serial.print((float)INA226.getBusMicroWatts()/1000.0,3); // Convert to milliwatts //
Serial.println(F("mW")); // //
Serial.println(); // //
for (uint8_t i=0;i<devicesFound;i++) { // Loop through all devices found //
Serial.print(F("Bus voltage ")); // //
Serial.print(i+1); // //
Serial.print(F(": ")); // //
Serial.print((float)INA226.getBusMilliVolts()/1000.0,4); // Convert to millivolts //
Serial.print(F("V\nShunt voltage ")); // //
Serial.print(i+1); // //
Serial.print(F(": ")); // //
Serial.print((float)INA226.getShuntMicroVolts()/1000.0,3); // Convert to millivolts //
Serial.print(F("mV\nBus amperage ")); // //
Serial.print(i+1); // //
Serial.print(F(": ")); // //
Serial.print((float)INA226.getBusMicroAmps()/1000.0,3); // Convert to milliamp //
Serial.print(F("mA\nBus wattage ")); // //
Serial.print(i+1); // //
Serial.print(F(": ")); // //
Serial.print((float)INA226.getBusMicroWatts()/1000.0,3); // Convert to milliwatts //
Serial.println(F("mW")); // //
Serial.println(); // //
} // of for-next each device loop // //
delay(5000); // //
} // of method loop //----------------------------------//
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