- #1
TheRedDevil18
- 406
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I have a micro-controller with 10 bit resolution. How can I convert the voltage or digital output of the microcontroller to a Lux reading ?
Measure LDR Light with Microcontroller - 10bit Resolution
- Thread starter TheRedDevil18
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- Ldr Lux Measurement
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To convert the output of a 10-bit microcontroller to Lux readings, one can analyze the relationship between measured voltage and Lux using simulation software like Proteus. The user has already created a curve from voltage measurements and seeks to derive an equation to correlate voltage to Lux values. A suggestion was made to use a transimpedance amplifier instead of a voltage divider, as it converts current to voltage, potentially improving measurement accuracy. The benefits of using a transimpedance amplifier include better performance in low-light conditions and increased sensitivity. Understanding the transimpedance amplifier's function will be crucial for implementing this approach effectively.
- #2
Jony130
- 626
- 137
See the example here
http://elm-chan.org/works/lux/report.html
http://elm-chan.org/works/lux/report.html
- #3
TheRedDevil18
- 406
- 2
Jony130 said:
I don't have a lux meter. I noticed proteus which is the software I use for simulation has one. What if I used that to find the relationship ?
I used a circuit like this and measured the voltage
This is the curve I got
So if I find the equation of this curve, then given a voltage I can get the LUX value ?
- #4
Jony130
- 626
- 137
Try to use a transimpedance Amplifier instead of voltage divider.
- #5
TheRedDevil18
- 406
- 2
Jony130 said:
What would be the benefit of using a transimpedance amplifier over the voltage divider ?, From what I've read, it converts current to voltage. I haven't studied this type of amplifier yet
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The drawing on the box led me to believe that it would accept a standard IEC cord which surprised me. But it's a variation of it. I didn't try it, but I would assume you could plug a standard IEC cord into this and have a double male cord AKA suicide cord. And to boot, it's likely going to reverse the hot and...
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