Light Meter
March 4, 2012
I was given a Yashica Mat-124G camera and you cannot get batteries for the light meter, so I decided to make one.
I already had the analog meter and the small box, so the two were a natural fit.
I also used Adobe Illustrator to make a new paper template and scale for the meter.
This needs some work and I realize this is not actual lux levels. The trick here is to come up with a scale useful to the camera I will be using it with.
The sketch I used is fairly simple. Basically I’m reading 10 values from the photocell and getting an average. This gives me a value from 0 – 1024. Then I map the values from 0 to 255 and write it to the meter. I am now the proud owner of probably the world’s biggest and simplest light meter.
Here are the parts I used:
2. 1k resistor, 10k resistor 10k & 100k resistor
3. Analog meter from Adafruit.
3. Battery pack with on/off switch
4. Photo cell
5. Wooden box (old cigar boxes work great.)
6. Wire and heat shrink
[...] Light Meter @ Electric Projects. I was given a Yashica Mat-124G camera and you cannot get batteries for the light meter, so I decided to make one. I already had the analog meter and the small box, so the two were a natural fit. I also used Adobe Illustrator to make a new paper template and scale for the meter. This needs some work and I realize this is not actual lux levels. The trick here is to come up with a scale useful to the camera I will be using it with. [...]
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