Mauricio Donatti
Digital 16bit Serial Output Type Ambient Light Sensor IC by ROHM, Ambient light sensor (Illuminance to digital converter). Forked from Kenji Arai BH1750, minor changes.
Revision 5:04cdce6242a6, committed 2022-01-17
- Comitter:
- mmdonatti
- Date:
- Mon Jan 17 12:55:09 2022 +0000
- Parent:
- 4:47d7e70dc9b8
- Commit message:
- new methods for triggering and single acquisitions
Changed in this revision
| BH1750.cpp | Show annotated file Show diff for this revision Revisions of this file |
| BH1750.h | Show annotated file Show diff for this revision Revisions of this file |
diff -r 47d7e70dc9b8 -r 04cdce6242a6 BH1750.cpp
--- a/BH1750.cpp Fri Sep 13 14:22:17 2019 +0000
+++ b/BH1750.cpp Mon Jan 17 12:55:09 2022 +0000
@@ -61,23 +61,102 @@
return lux;
}
+void BH1750::high_resolution2_trigger()
+{
+ dt[0] = CMD_1_H_RES_M2; // Measurement mode: Single High Resolution 2
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+}
+
+float BH1750::high_resolution2_read()
+{
+ float lux;
+ Hres=2;
+
+ _i2c.read(BH1750_addr, (char *)dt, 2, false);
+ lux = (float)(dt[0] << 8 | dt[1]);
+ lux = lux / 1.2f * ((float)sensitivity/69)/Hres;
+ return lux;
+}
+
+
+float BH1750::high_resolution2_trigger_read()
+{
+ high_resolution2_trigger();
+ wait_ms(180); // wait 180ms
+ return high_resolution2_read();
+}
+
+void BH1750::high_resolution_trigger(){
+ dt[0] = CMD_1_H_RES_M; // Measurement mode: Single High Resolution 2
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+}
+
+float BH1750::high_resolution_read(){
+
+ float lux;
+ Hres=1;
+ _i2c.read(BH1750_addr, (char *)dt, 2, false);
+ lux = (float)(dt[0] << 8 | dt[1]);
+ lux = lux / 1.2f * ((float)sensitivity/69)/Hres;
+ return lux;
+}
+
+
+float BH1750::high_resolution_trigger_read(){
+ high_resolution_trigger();
+ wait_ms(180); // wait 180ms
+ return high_resolution_read();
+}
+
+void BH1750::low_resolution_trigger(){
+ dt[0] = CMD_1_L_RES_M; // Measurement mode: Single High Resolution 2
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+}
+
+float BH1750::low_resolution_read(){
+ float lux;
+ _i2c.read(BH1750_addr, (char *)dt, 2, false);
+ lux = (float)(dt[0] << 8 | dt[1]);
+ lux = lux / 1.2f;
+ return lux;
+}
+
+float BH1750::low_resolution_trigger_read(){
+ low_resolution_trigger();
+ wait_ms(24);
+ return low_resolution_read();
+}
+
/////////////// Initialize ////////////////////////////////
void BH1750::init()
{
_i2c.frequency(100000);
- power_up();
- //sensitivity = SENS_1R00;
- //NEED to call one set mode after init
- //set_sensitivity(sensitivity);
+ power_up();
+ set_sensitivity(SENS_2);
+}
+
+/////////////// set sensitivity ////////////////////////////////
+void BH1750::set_sensitivity(uint8_t parameter)
+{
+ if (parameter > SENS_4){
+ parameter = SENS_4;
+ } else if (parameter < SENS_0){
+ parameter = SENS_0;
+ }
+ sensitivity = parameter;
+ dt[0] = CMD_M_TIME_H | (parameter >> 5); // Set High byte
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+ dt[0] = CMD_M_TIME_L | (parameter & 0x1f); // Set Low byte
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
}
/////////////// Timing Register ///////////////////////////
-void BH1750::set_high_resolution(uint8_t parameter)
+void BH1750::set_high_resolution_continuous(uint8_t parameter)
{
- if (parameter > SENS_3R68){
- parameter = SENS_3R68;
- } else if (parameter < SENS_0R45){
- parameter = SENS_0R45;
+ if (parameter > SENS_4){
+ parameter = SENS_4;
+ } else if (parameter < SENS_0){
+ parameter = SENS_0;
}
sensitivity = parameter;
Hres = 1;
@@ -90,13 +169,12 @@
wait_ms(240); // need normal conversion time(120mS) x 2
}
-/////////////// Timing Register ///////////////////////////
-void BH1750::set_high_resolution_2(uint8_t parameter)
+void BH1750::set_high_resolution2_continuous(uint8_t parameter)
{
- if (parameter > SENS_3R68){
- parameter = SENS_3R68;
- } else if (parameter < SENS_0R45){
- parameter = SENS_0R45;
+ if (parameter > SENS_4){
+ parameter = SENS_4;
+ } else if (parameter < SENS_0){
+ parameter = SENS_0;
}
sensitivity = parameter;
Hres = 2;
@@ -109,6 +187,24 @@
wait_ms(240); // need normal conversion time(120mS) x 2
}
+void BH1750::set_low_resolution_continuous(uint8_t parameter)
+{
+ if (parameter > SENS_4){
+ parameter = SENS_4;
+ } else if (parameter < SENS_0){
+ parameter = SENS_0;
+ }
+ sensitivity = parameter;
+ Hres = 2;
+ dt[0] = CMD_M_TIME_H | (parameter >> 5); // Set High byte
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+ dt[0] = CMD_M_TIME_L | (parameter & 0x1f); // Set Low byte
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+ dt[0] = CMD_C_L_RES_M; // Measurement mode: High Resolution 2
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+ wait_ms(240); // need normal conversion time(120mS) x 2
+}
+
/////////////// Power ON/OFF //////////////////////////////
void BH1750::power_up()
{
@@ -128,4 +224,11 @@
_i2c.frequency(hz);
}
+/////////////// Power ON/OFF //////////////////////////////
+void BH1750::reset()
+{
+ dt[0] = CMD_RESET;
+ _i2c.write((int)BH1750_addr, (char *)dt, 1, false);
+}
+
diff -r 47d7e70dc9b8 -r 04cdce6242a6 BH1750.h
--- a/BH1750.h Fri Sep 13 14:22:17 2019 +0000
+++ b/BH1750.h Mon Jan 17 12:55:09 2022 +0000
@@ -44,11 +44,11 @@
#define CMD_M_TIME_L 0x60
////////////// SENSITIVITY ////////////////////////////////
-#define SENS_1R00 69 //Default
-#define SENS_3R68 254 //High Sensitivity
-#define SENS_0R45 31
-#define SENS_2R00 138
-#define SENS_0R50 35
+#define SENS_2 69 //Default
+#define SENS_4 254 //High Sensitivity
+#define SENS_0 31
+#define SENS_3 138
+#define SENS_1 35
/** Interface for Luminosity sensor, BH1750
//@code
@@ -94,23 +94,46 @@
* @return Lux
*/
float lux(void);
+
+ void set_sensitivity(uint8_t parameter);
+
+ float high_resolution2_trigger_read();
+
+ float high_resolution_trigger_read();
+
+ float low_resolution_trigger_read();
+
+ void high_resolution2_trigger();
+
+ void high_resolution_trigger();
+
+ void low_resolution_trigger();
+
+ float high_resolution2_read();
+
+ float high_resolution_read();
+
+ float low_resolution_read();
/** Set sensor to high resolution mode
* @param sensitivity parameter
* @return none
*/
- void set_high_resolution(uint8_t parameter);
+ void set_high_resolution_continuous(uint8_t parameter);
/** Set sensor to high resolution mode
* @param sensitivity parameter
* @return none
*/
- void set_high_resolution_2(uint8_t parameter);
+ void set_high_resolution2_continuous(uint8_t parameter);
/** Set I2C clock frequency
* @param freq.
* @return none
*/
+
+ void set_low_resolution_continuous(uint8_t parameter);
+
void frequency(int hz);
/** Power Up/Down
@@ -119,6 +142,8 @@
*/
void power_up(void);
void power_down(void);
+
+ void reset(void);
protected:
I2C *_i2c_p;