In this Instructable I will show you how to make a robot that will be able to move towards a near by light source. This project uses a very simple circuit, so just about anyone can make it. I still have several improvements to make on this robot, but this is a good design for people who are new to this kind of thing. I made this robot using the 555 ic, because it is a very common, and easy to use component good for beginners, and does not require using programming or very complicated set up.
Step 1: Materials and tools
Materials for the circuit:
-NE555N IC chip
-two identical photoresistors (often called light dependent resistors or LDR) (I had to order these from mouser electronics)
-two identical motors
-battery case for 4 AAA batteries (or AAs. depends on how much weight your motors can take)
- printed circuit board
-bread board (for prototyping)
Materials for base:
-one piece of 1/8 inch plywood roughly 6" x 3"
-two other small pieces of scrap wood
-screws of various sizes.
-wheels (I used lego wheels)
-if you use lego wheels you will need a lego axle for two of the wheels.
-glue (gorilla glue is good if you have the patience otherwise hot glue will work.)
-hot glue gun
-drill (and bits)
Step 2: Prototyping
I guess this is technically an optional step, but I like to know something is going to work before I use it. this is where the bread board comes in. I will go into more detail on building the circuit in the next step.
Step 3: Building the circuit: installing the IC
I bought an Experimenter Printed Circuit Board from radio shack. This is useful because it has the exact same connections as my bread board does. I also purchased the IC chip at radio shack. I will describe how to make the circuit in the captions.