diff options
Diffstat (limited to 'src/ADS1115_WE.h')
| -rw-r--r-- | src/ADS1115_WE.h | 374 |
1 files changed, 195 insertions, 179 deletions
diff --git a/src/ADS1115_WE.h b/src/ADS1115_WE.h index 7fcd4ba..6d68123 100644 --- a/src/ADS1115_WE.h +++ b/src/ADS1115_WE.h @@ -28,224 +28,240 @@ #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 +#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 + 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, + ADS1115_LATCH_DISABLED = 0x0000, + ADS1115_LATCH_ENABLED = 0x0004, } latch; typedef enum ADS1115_ALERT_POL { - ADS1115_ACT_LOW = 0x0000, - ADS1115_ACT_HIGH = 0x0008 + ADS1115_ACT_LOW = 0x0000, + ADS1115_ACT_HIGH = 0x0008 } alertPol; typedef enum ADS1115_COMP_MODE{ - ADS1115_MAX_LIMIT = 0x0000, - ADS1115_WINDOW = 0x0010 + 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 = 0x0050, - ADS1115_128_SPS = 0x0080, - ADS1115_250_SPS = 0x00A0, - ADS1115_475_SPS = 0x00C0, - ADS1115_860_SPS = 0x00E0 + 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 + 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, + 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 + 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; typedef enum ADS1115_STATUS_OR_START{ - ADS1115_BUSY = 0x0000, - ADS1115_START_ISREADY = 0x8000 + 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); - - /* 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 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); - - 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(); + 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 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); + + 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; - int16_t calcLimit(float rawLimit); - uint8_t writeRegister(uint8_t reg, uint16_t val); - uint16_t readRegister(uint8_t reg); + uint16_t voltageRange; + ADS1115_MEASURE_MODE deviceMeasureMode; + int i2cAddress; + void delayAccToRate(convRate cr); + int16_t calcLimit(float rawLimit); + uint8_t writeRegister(uint8_t reg, uint16_t val); + uint16_t readRegister(uint8_t reg); }; |