At the age of 2, M was pretty adventuros and kept us busy tidying up closets and drawers. Part of our effort to keep his little hands busy, was to make him an activity board (busyboard). Here he could explore to his heart content, without any risk of cuts, burns, poisoning, electrocution or breaking expensive items. The board itself is nothing new.
Basically you cut a piece of fiberboard or plywood to desired size, paint it as you like, populate the board with whatever your child likes and mount the board to a suitable wall.
Our son had a special intrest in switches and colored lights and to accomodate that, I decided to mount 3 switches each controlling one channel of an RGB LED. The idea is that the individual colors can be turned on or off, one by one, enabling the child to mix the colors. The result can be seen in the video below.
The light feature is designed to be inexpensive and very easy to build. Its based on a single 5mm RGB common anode LED with voltage reducing resistors for each color. However individual leds for each color could just as easily have been used. I used hot glue to diffuse the light.
The diagram below shows the curcuit alongside my ghetto implementation of it.
As seen I built it using whatever I had lying around that day, making this instance of the project very inexpensive and low impact. Except for paint, solder and hot glue every part is made with salvaged materials.
When someone sees the board for the first time, children and adults alike, they seem to go straight for the light switches and stay there – fascinated.