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Merge pull request #76 from matthewlai/master
Refactoring, and exposing continuous mode
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| #include <Adafruit_ADS1X15.h> | ||
|
|
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| // Adafruit_ADS1115 ads; /* Use this for the 16-bit version */ | ||
| Adafruit_ADS1015 ads; /* Use this for the 12-bit version */ | ||
|
|
||
| // Pin connected to the ALERT/RDY signal for new sample notification. | ||
| constexpr int READY_PIN = 3; | ||
|
|
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| // This is required on ESP32 to put the ISR in IRAM. Define as | ||
| // empty for other platforms. Be careful - other platforms may have | ||
| // other requirements. | ||
| #ifndef IRAM_ATTR | ||
| #define IRAM_ATTR | ||
| #endif | ||
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| volatile bool new_data = false; | ||
| void IRAM_ATTR NewDataReadyISR() { | ||
| new_data = true; | ||
| } | ||
|
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| void setup(void) | ||
| { | ||
| Serial.begin(9600); | ||
| Serial.println("Hello!"); | ||
|
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||
| Serial.println("Getting differential reading from AIN0 (P) and AIN1 (N)"); | ||
| Serial.println("ADC Range: +/- 6.144V (1 bit = 3mV/ADS1015, 0.1875mV/ADS1115)"); | ||
|
|
||
| // The ADC input range (or gain) can be changed via the following | ||
| // functions, but be careful never to exceed VDD +0.3V max, or to | ||
| // exceed the upper and lower limits if you adjust the input range! | ||
| // Setting these values incorrectly may destroy your ADC! | ||
| // ADS1015 ADS1115 | ||
| // ------- ------- | ||
| // ads.setGain(GAIN_TWOTHIRDS); // 2/3x gain +/- 6.144V 1 bit = 3mV 0.1875mV (default) | ||
| // ads.setGain(GAIN_ONE); // 1x gain +/- 4.096V 1 bit = 2mV 0.125mV | ||
| // ads.setGain(GAIN_TWO); // 2x gain +/- 2.048V 1 bit = 1mV 0.0625mV | ||
| // ads.setGain(GAIN_FOUR); // 4x gain +/- 1.024V 1 bit = 0.5mV 0.03125mV | ||
| // ads.setGain(GAIN_EIGHT); // 8x gain +/- 0.512V 1 bit = 0.25mV 0.015625mV | ||
| // ads.setGain(GAIN_SIXTEEN); // 16x gain +/- 0.256V 1 bit = 0.125mV 0.0078125mV | ||
|
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||
| if (!ads.begin()) { | ||
| Serial.println("Failed to initialize ADS."); | ||
| while (1); | ||
| } | ||
|
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||
| pinMode(READY_PIN, INPUT); | ||
| // We get a falling edge every time a new sample is ready. | ||
| attachInterrupt(digitalPinToInterrupt(READY_PIN), NewDataReadyISR, FALLING); | ||
|
|
||
| // Start continuous conversions. | ||
| ads.startADCReading(ADS1X15_REG_CONFIG_MUX_DIFF_0_1, /*continuous=*/true); | ||
| } | ||
|
|
||
| void loop(void) | ||
| { | ||
| // If we don't have new data, skip this iteration. | ||
| if (!new_data) { | ||
| return; | ||
| } | ||
|
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| int16_t results = ads.getLastConversionResults(); | ||
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| Serial.print("Differential: "); Serial.print(results); Serial.print("("); Serial.print(ads.computeVolts(results)); Serial.println("mV)"); | ||
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| new_data = false; | ||
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| // In a real application we probably don't want to do a delay here if we are doing interrupt-based sampling, but we have a delay | ||
| // in this example to avoid writing too much data to the serial port. | ||
| delay(1000); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| #include <Adafruit_ADS1X15.h> | ||
|
|
||
| // Adafruit_ADS1115 ads; /* Use this for the 16-bit version */ | ||
| Adafruit_ADS1015 ads; /* Use this for the 12-bit version */ | ||
|
|
||
| void setup(void) | ||
| { | ||
| Serial.begin(9600); | ||
| Serial.println("Hello!"); | ||
|
|
||
| Serial.println("Getting differential reading from AIN0 (P) and AIN1 (N)"); | ||
| Serial.println("ADC Range: +/- 6.144V (1 bit = 3mV/ADS1015, 0.1875mV/ADS1115)"); | ||
|
|
||
| // The ADC input range (or gain) can be changed via the following | ||
| // functions, but be careful never to exceed VDD +0.3V max, or to | ||
| // exceed the upper and lower limits if you adjust the input range! | ||
| // Setting these values incorrectly may destroy your ADC! | ||
| // ADS1015 ADS1115 | ||
| // ------- ------- | ||
| // ads.setGain(GAIN_TWOTHIRDS); // 2/3x gain +/- 6.144V 1 bit = 3mV 0.1875mV (default) | ||
| // ads.setGain(GAIN_ONE); // 1x gain +/- 4.096V 1 bit = 2mV 0.125mV | ||
| // ads.setGain(GAIN_TWO); // 2x gain +/- 2.048V 1 bit = 1mV 0.0625mV | ||
| // ads.setGain(GAIN_FOUR); // 4x gain +/- 1.024V 1 bit = 0.5mV 0.03125mV | ||
| // ads.setGain(GAIN_EIGHT); // 8x gain +/- 0.512V 1 bit = 0.25mV 0.015625mV | ||
| // ads.setGain(GAIN_SIXTEEN); // 16x gain +/- 0.256V 1 bit = 0.125mV 0.0078125mV | ||
|
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||
| if (!ads.begin()) { | ||
| Serial.println("Failed to initialize ADS."); | ||
| while (1); | ||
| } | ||
|
|
||
| // Start the first conversion. | ||
| ads.startADCReading(ADS1X15_REG_CONFIG_MUX_DIFF_0_1, /*continuous=*/false); | ||
| } | ||
|
|
||
| void loop(void) | ||
| { | ||
| // If we don't have new data, skip this iteration. | ||
| if (!ads.conversionComplete()) { | ||
| return; | ||
| } | ||
|
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||
| int16_t results = ads.getLastConversionResults(); | ||
|
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| Serial.print("Differential: "); Serial.print(results); Serial.print("("); Serial.print(ads.computeVolts(results)); Serial.println("mV)"); | ||
|
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| // Start another conversion. | ||
| ads.startADCReading(ADS1X15_REG_CONFIG_MUX_DIFF_0_1, /*continuous=*/false); | ||
|
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| delay(1000); | ||
| } |