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Using multiple sensors + low power sleep #1

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Using multiple sensors + low power sleep #1

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8cfe8a4
Using multiple TSYS01 sensors
michalfapso Mar 20, 2018
d0fa954
Use LowPower library for deep sleep to save power instead of using de…
michalfapso Mar 20, 2018
ca4f90b
Added link to the LowPower library
michalfapso Mar 20, 2018
476fe15
Added default I2C address for compatibility with old code
michalfapso Mar 20, 2018
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48 changes: 35 additions & 13 deletions TSYS01.cpp
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Original file line number Diff line number Diff line change
@@ -1,54 +1,76 @@
#include "TSYS01.h"
#include <Wire.h>

#define TSYS01_ADDR 0x77
#ifdef TSYS01_USE_LOW_POWER
// Use deep sleep instead of delay() to save power. Get the library from https://github.com/LowPowerLab/LowPower
#warning "TSYS01_USE_LOW_POWER: enabled"
#include <LowPower.h>
#endif

#define TSYS01_RESET 0x1E
#define TSYS01_ADC_READ 0x00
#define TSYS01_ADC_TEMP_CONV 0x48
#define TSYS01_PROM_READ 0XA0

TSYS01::TSYS01() {
TSYS01::TSYS01(uint8_t i2cAddress)
: mAddress(i2cAddress)
{}

bool TSYS01::isValid() {
return mAddress != 0;
}

void TSYS01::init() {
Wire.beginTransmission(mAddress);
if (Wire.endTransmission() != 0) {
mAddress = 0;
return;
}

// Reset the TSYS01, per datasheet
Wire.beginTransmission(TSYS01_ADDR);
Wire.beginTransmission(mAddress);
Wire.write(TSYS01_RESET);
Wire.endTransmission();

#ifdef TSYS01_USE_LOW_POWER
LowPower.powerDown(SLEEP_15MS, ADC_OFF, BOD_OFF);
#else
delay(10);
#endif

// Read calibration values
for ( uint8_t i = 0 ; i < 8 ; i++ ) {
Wire.beginTransmission(TSYS01_ADDR);
Wire.beginTransmission(mAddress);
Wire.write(TSYS01_PROM_READ+i*2);
Wire.endTransmission();

Wire.requestFrom(TSYS01_ADDR,2);
Wire.requestFrom(mAddress, uint8_t(2));
C[i] = (Wire.read() << 8) | Wire.read();
}

}

void TSYS01::read() {

Wire.beginTransmission(TSYS01_ADDR);
Wire.beginTransmission(mAddress);
Wire.write(TSYS01_ADC_TEMP_CONV);
Wire.endTransmission();

delay(10); // Max conversion time per datasheet

Wire.beginTransmission(TSYS01_ADDR);
#ifdef TSYS01_USE_LOW_POWER
LowPower.powerDown(SLEEP_15MS, ADC_OFF, BOD_OFF);
#else
delay(10); // Max conversion time per datasheet
#endif

Wire.beginTransmission(mAddress);
Wire.write(TSYS01_ADC_READ);
Wire.endTransmission();

Wire.requestFrom(TSYS01_ADDR,3);
Wire.requestFrom(mAddress, uint8_t(3));
D1 = 0;
D1 = Wire.read();
D1 = (D1 << 8) | Wire.read();
D1 = (D1 << 8) | Wire.read();

calculate();
}

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5 changes: 4 additions & 1 deletion TSYS01.h
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Original file line number Diff line number Diff line change
Expand Up @@ -36,8 +36,10 @@ THE SOFTWARE.
class TSYS01 {
public:

TSYS01();

TSYS01(uint8_t i2cAddress = 0x77);

bool isValid();
void init();

/** The read from I2C takes up for 40 ms, so use sparingly is possible.
Expand All @@ -59,6 +61,7 @@ class TSYS01 {
uint32_t D1;
float TEMP;
uint32_t adc;
uint8_t mAddress;

/** Performs calculations per the sensor data sheet for conversion and
* second order compensation.
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