Newbee - Introduce Yourself

RE: Newbee

JS — Fri, 01 Jul 2022 19:30:03 +0000

@robotbuilder Thanks Brother, I will try to select the right thread.

P S

thanks for the schematic. Have a good weekend...

RE: Newbee

robotBuilder — Fri, 01 Jul 2022 04:11:04 +0000

@js

Yep the hall effect encoders are simpler than using optical encoders. Works a treat :) Just connect it directly to an Arduino input.

This is my simple circuit using the Roomba motors.

To enlarge image, right click image and choose Open link in new window.

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I wish I had simply replaced the battery instead of just gutting it for the motors.

This thread I notice is in the introduce yourself section and really should be in the other robots section.

RE: Newbee

JS — Fri, 01 Jul 2022 01:25:55 +0000

@robotbuilder Thanks for the info,I just thought i could use these parts to integrate into Bill's robot projects.

I see it uses the hall effect for input for timing and/or speed control. The electronics seem to be OK.

After further testing, I think the battery is faulty don't have time to replace individual bad cell/cells.

The only cost involved will be a source battery.

RE: Newbee

robotBuilder — Wed, 29 Jun 2022 06:03:28 +0000

@js

I actually picked up a non working Roomba at a garage sale. I found its batteries had leaked and that was the reason it wasn't working. I took out the motorized encoder wheels and used them in another robot and threw the rest away. The hard part fitting it to my own base was the curved sides.

https://www.irobotweb.com/-/media/MainSite/PDFs/About/STEM/Create/Create_2_Wheel_Hack.pdf

In this example I was testing dead reckoning code to see how close it came to returning to its starting point. The battery was an 18v 1.4Ah Lithium-Ion which clicked into a hand held drill and came with its own charger.

To enlarge image, right click image and choose Open link in new window.

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RE: Newbee

JS — Wed, 29 Jun 2022 03:31:13 +0000

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RE: Newbee

JS — Wed, 29 Jun 2022 03:04:15 +0000

@zander Yes, I have seen the same.

I have read some the "hacking the iRobot", I was thinking of a serial I2c protocol . to download it's firmware. I am now interested in using it's complete body function seeing it will make a great modified robot to learn robotics.. Thanks for the Link...

RE: Newbee

Ron — Wed, 29 Jun 2022 02:34:39 +0000

@js Yes, I remember the great NI-MH scam. No memory, but for heavy duty power tool users the batteries had very short service life. I bet $ to donuts that the cost to the likes of DeWalt was less though.

RE: Newbee

JS — Wed, 29 Jun 2022 02:22:17 +0000

@zander The battery consists of 12 cells wrapped in one pack, and is nickel metal hydride or( NI-MH), now the specs are 14.4 v@3000mAh or 3 amps. I have seen several generations of batteries and to my knowledge NI-MH retain no memory unlike its predecessor. In packs, cells can either short or open. I identify the bad cell or cells with my VOM and replace as needed. I try to replace bad cells with the same specs as of the original. It helps with the balance of charging..

Thanks for the URL, I will digest it and move forward on my quest to learn basic Robot function.

It is just another tear down for me..

RE: Newbee

robotBuilder — Wed, 29 Jun 2022 02:06:43 +0000

@js

So don't wreck it trying to pull it apart too soon!

My suggestion is you take it slowly starting with seeing how others have hacked the iRobot Roomba.

Google, "hack irobot roomba"

RE: Newbee

Ron — Wed, 29 Jun 2022 01:29:23 +0000

@js If it's an iPhone, go into Photos, hit select, select, hit the SHARE icon (box with up arrow in the top mid) thgen select your computer, they will be in the downloads folder. If it's android, there should be a similar 'share' button in the photos app.