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Centari
(@centari)
Eminent Member
Joined: 1 year ago
Posts: 45
 

Looks good, though I would use a slightly higher voltage to charge the batteries fully, and a charge controller to ensure full charge / prevent overcharge.


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Melbul
(@melbul)
Eminent Member
Joined: 4 months ago
Posts: 25
 

Update on the build:

motors and batteries fitted

corner sensors fitted

I2C comms verified to all sensors from Mega

motor test completed

 

so now for the programming of the 328’s and the mega!

 

wish me luck👍


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Melbul
(@melbul)
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Joined: 4 months ago
Posts: 25
 

Photo didn’t attach to reply🙄

C00534F3 4139 4544 B390 332C17AABF0B

 


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robotBuilder
(@robotbuilder)
Honorable Member
Joined: 2 years ago
Posts: 741
 

@melbul

So there are 16 sonar sensors?  It is certainly bristling with hardware,  makes my smaller test bases look very sparse!  I see a circuit board at the front which appears to have button switches. Any chance of a complete circuit diagram?

Have you run it on the floor yet when testing the motors?  I am assuming there are only two drive wheels so when it turns it has to swing the whole back end of the robot base around the centre point between the two drive wheels?

so now for the programming of the 328’s and the mega!
wish me luck👍

Yes good luck with that. There are some coders here that will probably help if you get stuck on anything.  In some ways the mechanical and electronic build is the easy part particularly if you are up to speed with the electronics.

Probably worth having your own thread for the robot?

 

This post was modified 4 weeks ago by robotBuilder

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Melbul
(@melbul)
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Joined: 4 months ago
Posts: 25
 

@robotbuilder

yes 16 ultrasonics with RGB LED’s signifying green for good, blue for getting close and red for stop.

the circuit board at the rear is the same design as Bill’s, it’s the motor control board, made originally with two Nano’s but now modified to ATMega328’s.

on the floor I have run the motor test sequence, again from Bill, and it works fine. The Omni wheels are excellent in that respect and it swings the rear around very easily. The two batteries provide plenty of ballast to assist with grip.


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robotBuilder
(@robotbuilder)
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Joined: 2 years ago
Posts: 741
 

@Milbul
on the floor I have run the motor test sequence, again from Bill, and it works fine. The Omni wheels are excellent in that respect and it swings the rear around very easily. The two batteries provide plenty of ballast to assist with grip.

Ok. I wondered because when I reversed my lightweight (not much ballast) robot base the single swivel wheel would slowly begin to turn and then jam sideways into the carpet causing the robot base to do a little jump not recorded by the encoders sending it off in the wrong direction. I intend looking for a better "swivel" wheel.

An outside robot would probably need better free running wheels to deal with grass, soft soil and so on with a sharp turn where the wheels you are using would essentially be moving sideways and fully dependent on those little wheels turning and the rest of the wheel not hitting anything.

 

 

This post was modified 4 weeks ago 2 times by robotBuilder

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Melbul
(@melbul)
Eminent Member
Joined: 4 months ago
Posts: 25
 

Pdf from Bills GitHub folder for the motor control board I have built.

@robotBuilder

😊 😊 


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