2 CdS photocells (The Electronic Goldmine #G14025; $3.00) 2 (0.01 mF) ... Install the complete circuit inside the box. Mount the two CdS photocells externally on opposing sides of the box.

While exploring alternatives, the idea arose to use a photocell instead of any ordinary voltage converter. It resulted in the circuit in Figure 1. Figure 1 Using photocells instead of a voltage ...

When you need to quantify the color of an object, you’ve got quite a few options. You can throw a Raspberry Pi camera and OpenCV at the problem and approach it through software, or you can bu… ...