/******************************************************************************
*
* This is a library for the ADS1115 A/D Converter
*
* You'll find several example sketches which should enable you to use the library.
*
* You are free to use it, change it or build on it. In case you like it, it would
* be cool if you give it a star.
*
* If you find bugs, please inform me!
*
* Written by Wolfgang (Wolle) Ewald
* https://wolles-elektronikkiste.de/en/ads1115-a-d-converter-with-amplifier (English)
* https://wolles-elektronikkiste.de/ads1115 (German)
*
*
******************************************************************************/
#ifndef ADS1115_WE_H_
#define ADS1115_WE_H_
#if (ARDUINO >= 100)
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
#include <Wire.h>
/* registers */
#define ADS1115_CONV_REG 0x00 // Conversion Register
#define ADS1115_CONFIG_REG 0x01 // Configuration Register
#define ADS1115_LO_THRESH_REG 0x02 // Low Threshold Register
#define ADS1115_HI_THRESH_REG 0x03 // High Threshold Register
/* other */
#define ADS1115_REG_FACTOR 32768
#define ADS1115_REG_RESET_VAL 0x8583
typedef enum ADS1115_COMP_QUE {
ADS1115_ASSERT_AFTER_1 = 0x0000,
ADS1115_ASSERT_AFTER_2 = 0x0001,
ADS1115_ASSERT_AFTER_4 = 0x0002,
ADS1115_DISABLE_ALERT = 0x0003
} compQue;
typedef enum ADS1115_LATCH {
ADS1115_LATCH_DISABLED = 0x0000,
ADS1115_LATCH_ENABLED = 0x0004,
} latch;
typedef enum ADS1115_ALERT_POL {
ADS1115_ACT_LOW = 0x0000,
ADS1115_ACT_HIGH = 0x0008
} alertPol;
typedef enum ADS1115_COMP_MODE{
ADS1115_MAX_LIMIT = 0x0000,
ADS1115_WINDOW = 0x0010
} compMode;
typedef enum ADS1115_CONV_RATE{
ADS1115_8_SPS = 0x0000,
ADS1115_16_SPS = 0x0020,
ADS1115_32_SPS = 0x0040,
ADS1115_64_SPS = 0x0060,
ADS1115_128_SPS = 0x0080,
ADS1115_250_SPS = 0x00A0,
ADS1115_475_SPS = 0x00C0,
ADS1115_860_SPS = 0x00E0
} convRate;
typedef enum ADS1115_MEASURE_MODE{
ADS1115_CONTINOUS = 0x0000, // keeping misspelled enum for backwards compatibility.
ADS1115_CONTINUOUS = 0x0000,
ADS1115_SINGLE = 0x0100
} measureMode;
typedef enum ADS1115_RANGE{
ADS1115_RANGE_6144 = 0x0000,
ADS1115_RANGE_4096 = 0x0200,
ADS1115_RANGE_2048 = 0x0400,
ADS1115_RANGE_1024 = 0x0600,
ADS1115_RANGE_0512 = 0x0800,
ADS1115_RANGE_0256 = 0x0A00,
} range;
typedef enum ADS1115_MUX{
ADS1115_COMP_0_1 = 0x0000,
ADS1115_COMP_0_3 = 0x1000,
ADS1115_COMP_1_3 = 0x2000,
ADS1115_COMP_2_3 = 0x3000,
ADS1115_COMP_0_GND = 0x4000,
ADS1115_COMP_1_GND = 0x5000,
ADS1115_COMP_2_GND = 0x6000,
ADS1115_COMP_3_GND = 0x7000
} mux;
#define ADS1115_COMP_INC 0x1000 // increment to next channel
typedef enum ADS1115_STATUS_OR_START{
ADS1115_BUSY = 0x0000,
ADS1115_START_ISREADY = 0x8000
} statusOrStart;
class ADS1115_WE
{
public:
ADS1115_WE(int addr);
ADS1115_WE(); // uses default I2C Address 0x48
void reset();
bool init();
/* Set number of conversions after which the alert pin will be active
* - or you can disable the alert
*
* ADS1115_ASSERT_AFTER_1 -> after 1 conversion
* ADS1115_ASSERT_AFTER_2 -> after 2 conversions
* ADS1115_ASSERT_AFTER_4 -> after 4 conversions
* ADS1115_DISABLE_ALERT -> disable comparator // alert pin (default)
*/
void setAlertPinMode(ADS1115_COMP_QUE mode);
/* Enable or disable latch. If latch is enabled the alarm pin will be active until the
* conversion register is read (getResult functions). If disabled the alarm pin will be
* deactivated with next value within limits.
*
* ADS1115_LATCH_DISABLED (default)
* ADS1115_LATCH_ENABLED
*/
void setAlertLatch(ADS1115_LATCH latch);
/* Sets the alert pin polarity if active:
*
* Enable or disable latch. If latch is enabled the alarm pin will be active until the
* conversion register is read (getResult functions). If disabled the alarm pin will be
* deactivated with next value within limits.
*
* ADS1115_ACT_LOW -> active low (default)
* ADS1115_ACT_HIGH -> active high
*/
void setAlertPol(ADS1115_ALERT_POL polarity);
/* Choose maximum limit or maximum and minimum alert limit (window)in Volt - alert pin will
* be active when measured values are beyond the maximum limit or outside the window
* Upper limit first: setAlertLimit_V(MODE, maximum, minimum)
* In max limit mode the minimum value is the limit where the alert pin will be deactivated (if
* not latched)
*
* ADS1115_MAX_LIMIT
* ADS1115_WINDOW
*/
void setAlertModeAndLimit_V(ADS1115_COMP_MODE mode, float hithres, float lothres);
/* Set the conversion rate in SPS (samples per second)
* Options should be self-explaining:
*
* ADS1115_8_SPS
* ADS1115_16_SPS
* ADS1115_32_SPS
* ADS1115_64_SPS
* ADS1115_128_SPS (default)
* ADS1115_250_SPS
* ADS1115_475_SPS
* ADS1115_860_SPS
*/
void setConvRate(ADS1115_CONV_RATE rate);
/* returns the conversion rate */
convRate getConvRate();
/* Set continuous or single shot mode:
*
* ADS1115_CONTINUOUS -> continuous mode
* ADS1115_SINGLE -> single shot mode (default)
*/
void setMeasureMode(ADS1115_MEASURE_MODE mode);
/* Set the voltage range of the ADC to adjust the gain:
* Please note that you must not apply more than VDD + 0.3V to the input pins!
*
* ADS1115_RANGE_6144 -> +/- 6144 mV
* ADS1115_RANGE_4096 -> +/- 4096 mV
* ADS1115_RANGE_2048 -> +/- 2048 mV (default)
* ADS1115_RANGE_1024 -> +/- 1024 mV
* ADS1115_RANGE_0512 -> +/- 512 mV
* ADS1115_RANGE_0256 -> +/- 256 mV
*/
void setVoltageRange_mV(ADS1115_RANGE range);
/* Set the voltage range automatically
* 1) changes into maximum range and continuous mode
* 2) measures the voltage
* 3) chooses the smallest range in which the measured voltage is <80%
* of the range's maximum
* 4) switches back to single shot mode if it was in this mode before
*
* Please be aware that the procedure takes the the time needed for several conversions.
* You should ony use it in case you expect stable or slowly changing voltages.
*/
void setAutoRange();
/* Set the automatic voltage range permanantly, but the range will only be changed if the
* measured value is outside 30 - 80% of the maximum value of the current range.
* Therefore this method is faster than setAutoRange().
*/
void setPermanentAutoRangeMode(bool autoMode);
/* Set the inputs to be compared
*
* ADS1115_COMP_0_1 -> compares 0 with 1 (default)
* ADS1115_COMP_0_3 -> compares 0 with 3
* ADS1115_COMP_1_3 -> compares 1 with 3
* ADS1115_COMP_2_3 -> compares 2 with 3
* ADS1115_COMP_0_GND -> compares 0 with GND
* ADS1115_COMP_1_GND -> compares 1 with GND
* ADS1115_COMP_2_GND -> compares 2 with GND
* ADS1115_COMP_3_GND -> compares 3 with GND
*/
void setCompareChannels(ADS1115_MUX mux);
/* Set to channel (0-3) in single ended mode
*/
void setSingleChannel(size_t channel);
bool isBusy();
void startSingleMeasurement();
float getResult_V();
float getResult_mV();
/* Get the raw result from the conversion register:
* The conversion register contains the conversion result of the amplified (!)
* voltage. This means the value depends on the voltage as well as on the
* voltage range. E.g. if the voltage range is 6.144 mV (ADS1115_RANGE_6144),
* +32767 is 6.144 mV; if the range is 4.096 mV, +32767 is 4.096 mV, and so on.
*/
int16_t getRawResult();
/* Scaling of the result to a different range:
* The results in the conversion register are in a range of -32767 to +32767
* You might want to receive the result in a different scale, e.g. -1023 to 1023.
* For -1023 to 1023, and if you have chosen e.g. ADS1115_RANGE_4096, 0 Volt would
* give 0 as result and 4.096 mV would give 1023. -4.096 mV would give -1023.
*/
int16_t getResultWithRange(int16_t min, int16_t max);
/* Scaling of the result to a different range plus scaling to a voltage range:
* You can use this variant if you also want to scale to a voltage range. E.g. in
* in order to get results equivalent to an Arduino UNO (10 bit, 5000 mV range), you
* would choose getResultWithRange(-1023, 1023, 5000). A difference to the Arduino
* UNO is that you can measure negative voltages.
* You have to ensure that the voltage range you scale to is smaller than the
* measuring voltage range.
*/
int16_t getResultWithRange(int16_t min, int16_t max, int16_t maxVoltage);
/* This function returns the voltage range ADS1115_RANGE_XXXX in Millivolt */
uint16_t getVoltageRange_mV();
/* With this function the alert pin will be active, when a conversion is ready.
* In order to deactivate, use the setAlertLimit_V function
*/
void setAlertPinToConversionReady();
void clearAlert();
private:
uint16_t voltageRange;
ADS1115_MEASURE_MODE deviceMeasureMode;
int i2cAddress;
bool autoRangeMode;
void delayAccToRate(convRate cr);
int16_t calcLimit(float rawLimit);
uint8_t writeRegister(uint8_t reg, uint16_t val);
uint16_t readRegister(uint8_t reg);
};
#endif
