I have been experimenting with some TEMT6000 light sensors and I have found that the sensor range is a little limited. In low light it reads zero and in bright light it maxes out.
The board is fitted with a 10k ohm resistor. Has anybody tried changing the resistor to change the sensitivity range?
I was considering using 3 sensors, one as is with the 10k ohm, one with a 5k ohm and one with a 20 k ohm.
The data sheet that I found for it doesn't mention the resistor.
It is certainly worth a try!
Collector current is proportional to light intensity...
Good news, it appears to work, and it was a lot simpler than I thought.
I thought that I would have to replace the resistor, which I think is a 0603 and I can hardly see it, never mind soldering it. However, from the schematic, the resister simply grounds the signal pin. I simply disconected the ground pin and added a resistor between the sensor and ground.
I added a 100K ohm resistor and it is now giving me readinga at much lower light levels.
If you are calculating the lux level, you need to adjust the resistor.
Lux = milliamps * 2 for this unit.
I'm thinking of setting up a system where the resistor can be set by the sketch depending on light levels.
Using 4 output pins I can turn on 4 transistors to engague the resistors. However, would there be a significant resistance accross the transistor?
Would I be better using MOFSETs?
I'm a bit clueless, if I do use MOFSETs, should they be p type or n type?
Thanks a lot Jim.
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