userx2
Full Member level 3
I have a problem with the standalone daylight sensor (Renesas ISL29102) I use in that it is way to slow to decay.
The reason is that I need to measure the ambient light in between PWM cycles of some LEDS.
Old sensor:
https://www.renesas.com/us/en/document/dst/isl76671-datasheet
I am considering re-designing the circuit to use a photodiode and amplifier instead.
The original sensor has a spectral range of ~450-660nm with approximately 550nm peak.
It is claimed to close to human eye response.
The photodiodes with reasonable lead times do not have this specrtral range.
Do I need such a wide spectral range to sense ambient light?
example:
This is to dim down some leds when the ambient light level is lowered.
The reason is that I need to measure the ambient light in between PWM cycles of some LEDS.
Old sensor:
https://www.renesas.com/us/en/document/dst/isl76671-datasheet
I am considering re-designing the circuit to use a photodiode and amplifier instead.
The original sensor has a spectral range of ~450-660nm with approximately 550nm peak.
It is claimed to close to human eye response.
The photodiodes with reasonable lead times do not have this specrtral range.
Do I need such a wide spectral range to sense ambient light?
example:
This is to dim down some leds when the ambient light level is lowered.