Add light sensor driver

components/sensors/sensors.c

@@ -122,6 +122,17 @@ void read_sensor2(int32_t* temp, uint32_t* pressure, uint32_t* humidity) {
 	*humidity = comp_data.humidity;
 }
 
+double read_light_sensor() {
+	uint8_t raw_high = 0;
+
+	i2c_read(0x4a, 0x03, &raw_high, 1);
+
+	uint8_t exp = raw_high >> 4;
+	uint8_t mant = raw_high & 0b00001111;
+
+	return pow(2, exp) * mant * 0.72;
+}
+
 void init_sensors()
 {
 	// INIT SENSOR

components/sensors/sensors.h

@@ -11,9 +11,11 @@
 #include "bme280.h"
 #include "bme280_defs.h"
 #include "driver/i2c.h"
+#include "math.h"
 
 void init_sensors();
 void read_sensor2(int32_t* temp, uint32_t* pressure, uint32_t* humidity);
 void read_sensor(int32_t* temp, uint32_t* pressure, uint32_t* humidity);
+double read_light_sensor();
 
 #endif /* COMPONENTS_SENSORS_SENSORS_H_ */