Skip to content

Kams Electronics

Accomplishments, Projects, and Inventions.

Kams Electronics

Kams Electronics

  • Home
  • Blog
  • Podcasts
  • Portfolio
  • Projects and Worklogs
  • Contact
  • About Me
Search

556 Light Seeking Robot

First posted: February 15, 2019May 13, 2019Filed under: ProjectComment

This is something I worked on over the course of 2 weeks. It was meant for my final project in my Engineering First Year class. Its a 556 Based light seeking robot. I can’t take full credit for the idea because I borrowed the schematic from an instructables and modified it a bit to use the 556 and along with a few other changes to make it more stable.

Original Schematic:

My Altered Schematic:
Take note, It has been a while since I used Kicad so my schematic might not look very neat:

Chip Pinouts:

Components:
Project Motors and Wheels- Amazon
Long Single Side PCB- Amazon
Light Dependent Resistors- Amazon
556 Timerย – Digi-key
Project Wires – Amazon
2x NPN transistors – Amazon
4x 10k resistor – Amazon
2x 0.01uf Capacitors – Amazon
2x Flyback Diode – Amazon
9V Battery- House Hold
Hot Glue – House Hold

Process:
This project is pretty straight forward. Follow the Schematic and make sure to solder the components to the board. From there use the wire to jump the connections. Keep the LDRs in the front and the wheels and battery in the back. The PCB I linked above has 2 rails on both side for power. Use Super glue to glue the motors to the back. Once they are stuck on, attach the Wheels that came with the motors and there you have it.

How it works:
This robot requires 2 555 timers in Bistable mode. Because the 556 is just 2 of them in a single package you can see how easy it is to substitute it. The trigger of each 555 is connected to the LDR. When light hits the LDR, the resistance decreases. Causing the output of the 555 to Increase. The output is connected to the base of an NPN transistor.The collector and emitter are set between the battery and the motor. So basically when the light is on, the timer puts the NPN in an active state turningย  the Motors turn on. When the light is off, the transistor goes off causing the motor to turn off. Another thing I added, that the original design did not have, was a flyback diode across the motor. This helps protect the circuit from reverse current after all we don’t want our transistors fried.

Example of a Flyback Diode:

Project

Post navigation

Previous Post:

Circuit of the week – ZB2L3 Capacity Tester

Next Post:

๐Ÿ”Ž Electronics Research? ๐Ÿ”

About the Author

Kam

All posts by Kam

Hide

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recent Posts

  • Its been a while February 16, 2020
  • #2 โ€“ Return From a Long Break September 7, 2019
  • Getting Into the Grind August 2, 2019
  • Where Have I Been? July 25, 2019
  • A Quick Update May 31, 2019
  • ๐ŸŒž Summer’s here! ๐ŸŒž May 13, 2019

Posts By Date

February 2019
S M T W T F S
« Jan   Mar »
 12
3456789
10111213141516
17181920212223
2425262728  

Archives

RSS Electronix Addicts RSS

  • About Me
  • Blog
  • Contact
  • Home
  • Portfolio
  • Projects and Worklogs
© 2012 – 2020 Kams Electronics