Here’s how to make a pinhole camera from a single sheet of poster board. I came up with it in order to teach a bunch of kids how to make a pinhole camera and how they work, so I needed materials which would be inexpensive and which I could find in abundance.
Poster board is available at art stores and stores with an art or school supply section like Walmart. Most dollar stores and discount stores also have them and they cost only around $1 dollar (US) each.
Ideally the poster board should be 21 7/8″ x 28″, and the one I’d developed this with was. However, I later bought some more and they were 21 7/8″ x 27 3/4″, so 1/4″ shorter on the long side. I show below how I handled that in case it happens to you too.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.