HoloCubic/2.Firmware/HoloCubic_fw/ambient.cpp
2021-01-22 15:08:49 +08:00

56 lines
1.1 KiB
C++

#include "ambient.h"
void Ambient::init(int mode)
{
mMode = mode;
switch (mode)
{
case ONE_TIME_H_RESOLUTION_MODE:
sample_time = 125;
break;
case ONE_TIME_H_RESOLUTION_MODE2:
sample_time = 125;
break;
case ONE_TIME_L_RESOLUTION_MODE:
sample_time = 20;
break;
}
Wire.begin(AMB_I2C_SDA, AMB_I2C_SCL);
delay(50);
Wire.beginTransmission(ADDRESS_BH1750FVI); //"notify" the matching device
Wire.write(mMode); //set operation mode
Wire.endTransmission();
}
unsigned int Ambient::getLux()
{
if (millis() - last_time > sample_time)
{
last_time = millis();
Wire.requestFrom(ADDRESS_BH1750FVI, 2); //ask Arduino to read back 2 bytes from the sensor
highByte = Wire.read(); // get the high byte
lowByte = Wire.read(); // get the low byte
sensorOut = (highByte << 8) | lowByte;
illuminance = sensorOut / 1.2;
for (int i = 4; i > 0; i--) lux[i] = lux[i - 1];
lux[0] = illuminance;
Wire.beginTransmission(ADDRESS_BH1750FVI); //"notify" the matching device
Wire.write(mMode); //set operation mode
Wire.endTransmission();
}
unsigned int avg = 0;
for (int i = 4; i >= 0; i--) avg += lux[i];
avg /= 5;
return avg;
}