60 lines
1.2 KiB
C++
60 lines
1.2 KiB
C++
#include <Arduino.h>
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#include <Wire.h>
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#include "AHT10.h"
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static const uint8_t AHT10_ADDR = 0x38;
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bool AHT10::begin() {
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Wire.beginTransmission(AHT10_ADDR);
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Wire.write(0xE1);
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Wire.write(0x08);
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Wire.write(0x00);
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return Wire.endTransmission() == 0;
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}
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bool AHT10::reset() {
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Wire.beginTransmission(AHT10_ADDR);
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Wire.write(0xBA);
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return Wire.endTransmission() == 0;
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}
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bool AHT10::measure(float *temp, float *hum) {
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uint8_t data[6];
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uint32_t d;
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Wire.beginTransmission(AHT10_ADDR);
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Wire.write(0xAC);
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Wire.write(0x33);
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Wire.write(0x00);
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if (Wire.endTransmission())
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return false;
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delay(75);
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if ((Wire.requestFrom(AHT10_ADDR, (uint8_t)6) != 6) || (Wire.readBytes(data, 6) != 6))
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return false;
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if (temp) {
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d = ((uint32_t)(data[3] & 0x0F) << 16) | ((uint32_t)data[4] << 8) | data[5];
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*temp = (float)d * 200 / 1048576 - 50;
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}
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if (hum) {
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d = ((uint32_t)data[1] << 12) | ((uint32_t)data[2] << 4) | (data[3] >> 4);
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*hum = (float)d * 100 / 1048576;
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}
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return true;
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}
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float AHT10::getTemperature() {
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float result;
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if (! measure(&result, NULL))
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result = NAN;
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return result;
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}
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float AHT10::getHumidity() {
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float result;
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if (! measure(NULL, &result))
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result = NAN;
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return result;
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}
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