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Old 4th August 2017, 01:07   #61
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Default Re: Review: Raspberry Pi, the $5 computer

Recently made a tankbot using the Pi. Unfortunately, my model A+ died just a week back, so had to get the 3 model B this time. I must say, the speeds are outstanding and response times are excellent. The bot is controlled through an IOT cayenne app. A wireless camera has also been mounted. The only problem is that I cannot figure out how to turn. The motors are hooked upto relays. A bit of help would be appreciated here.

Here's a pic. Named it obilux, inspired by a Fortuner on our forum:
Review: Raspberry Pi, the  computer-20479794_1719660198328512_6611803059744784166_n.jpg

Last edited by vishy76 : 4th August 2017 at 01:09.
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Old 17th August 2017, 16:18   #62
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Default Re: Review: Raspberry Pi, the $5 computer

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Originally Posted by vishy76 View Post
Recently made a tankbot using the Pi. Unfortunately, my model A+ died just a week back, so had to get the 3 model B this time. I must say, the speeds are outstanding and response times are excellent. The bot is controlled through an IOT cayenne app. A wireless camera has also been mounted. The only problem is that I cannot figure out how to turn. The motors are hooked upto relays. A bit of help would be appreciated here.

Here's a pic. Named it obilux, inspired by a Fortuner on our forum:
Attachment 1663572
Can you share more details of the build ? Am looking at doing something similar with RPi.
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Old 23rd August 2017, 17:09   #63
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Can you share more details of the build ? Am looking at doing something similar with RPi.
I used an app called cayenne to control the relays on the pi and have wired up the motors to them. The camera I used is a wireless cam, which transmits radio signals and is pretty old school with a reciever.

You can PM me for more details.
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Old 23rd August 2017, 17:20   #64
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Default Re: Review: Raspberry Pi, the $5 computer

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The only problem is that I cannot figure out how to turn. The motors are hooked upto relays.
I'm assuming you have wired the motors independently; or at least kept the left and right controls separate. When I had made a similar bot, I wired the left and right sides separately.

To turn right, only the LHS wheels must be moving forward and vice versa for the left turning. For on the spot turns (like the auto rickshaws), move LHS side forward and the RHS side in reverse.

I hope this helps. Similar systems are used in tracked vehicles (like tanks) to turn.
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Old 23rd August 2017, 17:24   #65
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I'm assuming you have wired the motors independently; or at least kept the left and right controls separate. When I had made a similar bot, I wired the left and right sides separately.

To turn right, only the LHS wheels must be moving forward and vice versa for the left turning. For on the spot turns (like the auto rickshaws), move LHS side forward and the RHS side in reverse.

I hope this helps. Similar systems are used in tracked vehicles (like tanks) to turn.
Thanks a lot. I did get the bot to back up and go forwards according to my whims.

However, when I tried to turn it, I provided full power on the right side forwards and full power to the left as well, albiet in reverse which should have enabled it to turn. (Do correct me if I am wrong here)

But, it didn't. The weight of the bot is just too much. I will need to source more powerful motors. I am currently running 300rpms at the front and 1000rpms at the rear. Willl see if I can get 2000 rpms front and back.
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Old 23rd August 2017, 18:11   #66
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Default Re: Review: Raspberry Pi, the $5 computer

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However, when I tried to turn it, I provided full power on the right side forwards and full power to the left as well, albiet in reverse which should have enabled it to turn. (Do correct me if I am wrong here)
The reason it didn't turn is due to four wheels. Just powering left or right side might help but the turn will be executed in a very crude and unpredictable manner. Reminds me of college days! We would either have three wheels, third one omni-directional or make tank like tracks to join the two wheels on each side. Three wheel option always gave much finer control though.
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