Photon I2C BH1750

Hardware
1

Hi,
I try to connect a BH1750 light sensor via I2C to my photon.
Wiring is:
3.3V -> VCC
GND -> GND
D1 -> SCL
D0 -> SDA
I used the I2C- Scanner and everything I see on Serial Monitor are fancy I2C -Adresses like:

Scanning...
I2C device found at address 0x5B !
done
Scanning...
No I2C devices found
Scanning...
I2C device found at address 0x12 !
done
Scanning...
I2C device found at address 0x64 !
I2C device found at address 0x69 !
done
Scanning...
No I2C devices found
Scanning...
I2C device found at address 0x40 !
done

I’d expected a detection of 0x23. I tested an alternative BH1750 and the same story here.
Feel lost at this point. Anybody who can help?

Thanks,

Michael

2

You should try that sensor without any other I2C clients first.

3

Thanks for your quick reply.
The BH1750 is the only client…

4

Hmm, then I’m surprised your I2C scanner log suggests there are other devices too.
When this is not the case, then I suspect some bad connections.

5

@MF42, does your BH1750 board have I2C pull-ups?

1 Like
6

arrrgh, sorry my fault. Put two 5.2k as pull-ups and it works. Thank you!!

7

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