peterembedded / bh1750fvi Goto Github PK

The function GetLightIntensity() should be a Wire.requestFrom() with two reads.
The Wire.beginTransmission() and Wire.endTransmission() may be removed from that function.
Explanation: Common-mistakes, number 2 and 3.
See also my alternative explanation of the functions of the Wire library.

Hi!
I am used your library, works good.
But , I have a question.
How can I check that the sensor is working good?
This library is has any function to do this or I have to do a simple I2C address check on other way?
For example: checking the address before read light value from the sensor.

Thanks.

Hi. I've seen similar libraries for the BH1750, that has a sensitivity setting set with LightSensor.SetSensitivity.
"LightSensor.SetSensitivity(1.00);** - Changes the sensitivity of the sensor by changing the measurement time without re-scaling the resulting value. Thus increasing the sensitivity compensates for something partially blocking light to the sensor. The range in scaling is 0.45 to 3.68. Default is 1.00"
reason I'm looking for this, is that my sensor sits where readings are too low (0 or 1 most of the time).
Is this feature available in your implementation, or is there some workaround to achieve same result ?
Thanks

There is an error in the calculation of the brightness in mode "H-Resolution Mode2".
In this mode the value must be divided by two again to get the correct brightness.

Reproducibility:
Switch between "H-Resolution Mode" and "H-Resolution Mode2" to see that the value is suddenly halved.

https://www.mouser.com/datasheet/2/348/bh1750fvi-e-186247.pdf on page 11

H-reslution mode : Illuminance per 1 count ( lx / count ) = 1 / 1.2 *( 69 / X )
H-reslution mode2 : Illuminance per 1 count ( lx / count ) = 1 / 1.2 *( 69 / X ) / 2

I did the asked connection and my code is also similar to your's but when I run the program I am getting corrupted data in my serial monitor.

Hi I am trying to use your library on an Arduino UNO. I have the SCL pin on A4 and DAT pin on A5.

All I am getting is lux value of 54612

Here is my code:

/*
This is a simple example to test the BH1750 Light sensor

Connect the sensor to a NodeMCU ESP8266:
VCC <-> 3V3 [grey]
GND <-> Gnd [purple]
SDA <-> D2 [green]
SCL <-> D1 [blue]
ADDR <-> RX [yellow]
*/

#include <Wire.h>
#include <BH1750FVI.h>

// Settings

int addressPin = A4;
int devicePin = A5;
BH1750FVI::eDeviceMode_t DEVICEMODE = BH1750FVI::k_DevModeContHighRes;

// Create the Lightsensor instance
BH1750FVI LightSensor(addressPin, devicePin, DEVICEMODE);

void setup()
{
Serial.begin(9600);
LightSensor.begin();
Serial.println("Running...");
}

void loop()
{
uint16_t lux = LightSensor.GetLightIntensity();
Serial.print("Light level: ");
Serial.println(lux);
delay(2000);
}