Analog 1 wall following

 *Updated/Larger schematic*

       This is a robot I decided to make over the weekend, or at least the analog brain for it. I've had the base done for a while now.  I recieved some breadboards and a jumper wire kit and decided to replicate a 556 timer controlled, wall following robot I saw on Make.

       I've stumbled upon a few problems in the original schematic so I drew up my own. I also had enough room left on the medium breadboard for a light/dark activated switch, this added another behavior to the robot.  It uses a 741 op amp, one 556 timer, and various components to control the signal to the servos connected to the wheels.  The 741 is just to buffer the incoming signal off the long range IR sensor. I hope you guys enjoy this robot since it's very fun and easy to make.  The hardest thing about it was adjustment of the potentiometers but you only have to do it once :). 

      The base is made out of hand-laid carbon fiber, the battery is a li-ion 4800mAh battery. It's a very light wieght and strong base. You don't have to go as fancy as the DC-DC converter you can easly replace it with a simple dropout regulator as well, though you may have to use a heatsink.  One of the potential abilities of this robot is, if it has a solar panel, and a certain amount of light hits the cds sensor it will stop and charge from the incoming light.  Also, when the sun sets and/or the light turns off or dims, it can continue following the wall.  Thus creating a very simple self-charging analog robot. Enjoy!!  If you have any questions, just send them my way.