I have a working BH1750 on a raspberry pi using the following:
Node node-red-contrib-i2c
35 is the address of the sensor, 16 is the command to get the lux value.
Followed by a change node:
The JSONata expression is:
Which is converting the two byte value returned by the i2c node to a decimal value and dividing the result by 1.2 as described in the datasheet (the sensor returns values that are typically 20% too high), and rounding to 2 decimal places.
msg.lux contains the result.
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