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ATmega 328P
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LCD display sheild
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BPW-34 PiN photodiode
These are really cheap silicon photodiodes that cover nearly all the visual spectrum plus a little bit of the near IR.
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CA3130 op amp
The choice of the right op amp is really critical as discussed in one of the project logs
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LM9805 linear voltage regulator
A buck converter can also be used provided one uses a good decoupling practices to filter out the high frequency noise. Linear regulators are a lot less noisy but not very suitable for battery powered applications
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