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127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
#pragma once
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// FILE: INA219.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.1
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// DATE: 2021-05-18
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// PURPOSE: Arduino library for INA219 voltage, current and power sensor
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// URL: https://github.com/RobTillaart/INA219
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//
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// Read the datasheet for the details how to connect!
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#include "Arduino.h"
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#include "Wire.h"
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#define INA219_LIB_VERSION (F("0.2.1"))
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class INA219
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{
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public:
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// address between 0x40 and 0x4F
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explicit INA219(const uint8_t address, TwoWire *wire = &Wire);
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bool begin();
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bool isConnected();
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uint8_t getAddress();
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// CORE FUNCTIONS // Register
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float getShuntVoltage(); // 01
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float getBusVoltage(); // 02
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float getPower(); // 03
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float getCurrent(); // 04
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bool getMathOverflowFlag(); // 02
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bool getConversionFlag(); // 02
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// SCALE HELPERS - milli range
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float getBusVoltage_mV() { return getBusVoltage() * 1e3; };
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float getShuntVoltage_mV() { return getShuntVoltage() * 1e3; };
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float getCurrent_mA() { return getCurrent() * 1e3; };
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float getPower_mW() { return getPower() * 1e3; };
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// SCALE HELPERS - micro range
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float getBusVoltage_uV() { return getBusVoltage() * 1e6; };
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float getShuntVoltage_uV() { return getShuntVoltage() * 1e6; };
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float getCurrent_uA() { return getCurrent() * 1e6; };
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float getPower_uW() { return getPower() * 1e6; };
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// CONFIGURATION
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// need improvement API wise.
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bool reset();
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// voltage = 16, 32 (values below 32 are rounded to 16 or 32)
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bool setBusVoltageRange(uint8_t voltage = 16);
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uint8_t getBusVoltageRange(); // returns 16 or 32.
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// factor = 1, 2, 4, 8
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bool setGain(uint8_t factor = 1);
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uint8_t getGain();
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// configuration BUS
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// use one of the next three
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bool setBusResolution(uint8_t bits); // 9..12, always 1 sample
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bool setBusSamples(uint8_t value); // 0..7, always 12 bits.
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bool setBusADC(uint8_t mask = 0x03); // uses a mask, check datasheet
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uint8_t getBusADC();
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// configuration SHUNT
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// use one of the next three
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bool setShuntResolution(uint8_t bits); // 9..12, always 1 sample
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bool setShuntSamples(uint8_t value); // 0..7, always 12 bits.
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bool setShuntADC(uint8_t mask = 0x03); // uses a mask, check datasheet
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uint8_t getShuntADC();
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// Operating mode = 0..7
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bool setMode(uint8_t mode = 7);
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uint8_t getMode();
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bool shutDown() { return setMode(0); };
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bool setModeShuntTrigger() { return setMode(1); };
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bool setModeBusTrigger() { return setMode(2); };
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bool setModeShuntBusTrigger() { return setMode(3); };
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bool setModeADCOff() { return setMode(4); };
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bool setModeShuntContinuous() { return setMode(5); };
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bool setModeBusContinuous() { return setMode(6); };
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bool setModeShuntBusContinuous() { return setMode(7); }; // default.
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// CALIBRATION
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// mandatory to set these! read datasheet.
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// maxCurrent >= 0.001
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// shunt >= 0.001
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bool setMaxCurrentShunt(float maxCurrent = 3.4,
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float shunt = 0.002);
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bool isCalibrated() { return _current_LSB != 0.0; };
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// these return zero if not calibrated!
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float getCurrentLSB() { return _current_LSB; };
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float getCurrentLSB_mA() { return _current_LSB * 1e3; };
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float getCurrentLSB_uA() { return _current_LSB * 1e6; };
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float getShunt() { return _shunt; };
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float getMaxCurrent() { return _maxCurrent; };
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// DEBUG
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uint16_t getRegister(uint8_t reg) { return _readRegister(reg); };
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private:
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uint16_t _readRegister(uint8_t reg);
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uint16_t _writeRegister(uint8_t reg, uint16_t value);
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float _current_LSB;
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float _shunt;
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float _maxCurrent;
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uint8_t _address;
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TwoWire * _wire;
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};
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// -- END OF FILE --
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