Let's Make Robots!

Steve-O

Seek's out darkness while avoiding obstacles.
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This is my second robot.  My son found some online bit pricey tho. And of course me being a PLC guy decided hey i will build my own.( what a learning expirience).  I will post my complete build when I finish the final revision. new body new code and better accuracy. Well least that is the plan.

  his body is made of aluminum and balsa wood.  Tried to keep him as light as possible.

  I decided to go with a 1/16th scale R/C car battery. Last about 2 hours and charges in about 4hours. Not too bad.

Wondering Bot

( close up! )  this size body I found to be just too small. Beleive it or not but a lot of noise problems I have found to be that the sensors are just too close together.  You can put all the capacitors you want on you board. I have come to realize that 8" wide is really pushing the limit on the small scale. I will keep my bots about 10" wide. Try it watch the difference you see.

 

Wondering Bot

( da back ) Putting the head towards the back is also not a good location.  If you do be sure to have the sensor raised at a pretty high distance. 

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I like the robot's new responces in the lower video. I especially like the way he has a lot less wasted motion now to navigate the real world.

Great job.

 

Thank you.

 

A gentlemen on here gave me a bit of advice.. so I made some changes and hoping to add in some LDR sensors still working that out. Any advice on the subject?

Not specifically, but if you have questions, I should be able to help with a schematic.

LDRs are fairly easy to implement. Usually used with analog inputs, they can even be used with a digital input, but if you do, best to make the series resistance a variable potentiometer so you can adjust the light level to trip between zero and one logic.

Typical #1: power bus to one side of pot. — other side of pot. to one side of LDR — other side of LDR to ground. Then attach the mid-point between LDR and pot. to an input.

Typical #2: It can also be the reverse. power to LDR — LDR to pot. — pot. to ground, — with the mid-point between LDR and pot going to an input.

Other ways to implement an LDR would be to include a transistor amp or an op-amp or comparator for more positive responce.

 

i used a 10k resistor 

 

i have it working pretty good now just need to tweak and see what happens

This is my second robot.  My son found some online, bit pricey tho and me being a PLC guy decided hey i will build my own..  what a learning expirience.  I will post my complete build when I finish the final revision. new body new code and better accuracy. Well least that is the plan.

Still a working progress