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by BIMThoughts
Tue Aug 13, 2019 6:00 pm
Forum: General discussion
Topic: Pi Zero W, VS 3B+, VS 4 for low CPU applications?
Replies: 24
Views: 1736

Re: Pi Zero W, VS 3B+, VS 4 for low CPU applications?

Hello, I have all way too many Pi's. The Pi Zero is slowest of the three by far, but for running as a server, it does ok. I am using a Pi Zero W in my Rover Project as it has enough power and consumes less power. The 3B+ is an excellent Pi and runs the GUI very well. I have two in use right now: Oct...
by BIMThoughts
Sat Jun 30, 2018 11:59 pm
Forum: Automation, sensing and robotics
Topic: Powering the Pi Question
Replies: 5
Views: 667

Re: Powering the Pi Question

I do have some 1N5817 Schottky Diode between the charge controller and the solar panels to prevent loss that direction. I did try putting the same diodes the other way as well from the controller to the Pi. I did not see any difference with the second set, so I removed them. I think the charge contr...
by BIMThoughts
Sat Jun 30, 2018 3:14 pm
Forum: Automation, sensing and robotics
Topic: Powering the Pi Question
Replies: 5
Views: 667

Re: Powering the Pi Question

Well, looks like I am the victim of too much and too little information, and it looks like my original post is starting to get off to battery blow up topic. Yes LiPo can blow up, burn the house down, and kill baby kittens. Please assume for this topic that the power source is connected safely. What ...
by BIMThoughts
Sat Jun 30, 2018 4:07 am
Forum: Automation, sensing and robotics
Topic: Powering the Pi Question
Replies: 5
Views: 667

Powering the Pi Question

Hello, I would like to run this by the group for feedback. Compute Power.png Little background: Battery power is coming from (4) 18650 LiPo batteries in parallel. The batteries are controlled with a 03962A charger / limiter. The charge is coming from (3) 5v 2.5w solar panels in parallel. This is wor...
by BIMThoughts
Fri Jun 29, 2018 1:56 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

It's been awhile since my last update. I am in the middle of my 9th version of testing Solar. My previous record was four nights. Last night was the 5th glorious night for solar test #9. After receiving inspiration from the "Solar-Powered Squirrel Kam" project. https://www.hackster.io/reichley/solar...
by BIMThoughts
Sun May 13, 2018 4:49 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Back with an update: Solar Test 6. SolarTest6Camera.JPG Took a bit of a work break, but I am back solar testing. I was able to get the Raspberry Pi to work for a week with four batteries. Now I am again trying to get it to work with only three batteries. I am using (3 each) 18650 Li-ion batteries, ...
by BIMThoughts
Fri Mar 30, 2018 2:02 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Starting Solar test 4 today, Last time I was able to get 30 hours out of 4 AA NiMh batteries. Today I am shooting for making it through the second-night barrier. This time I am using three 1N5817 Schottky diodes to keep the energy from going from the batteries to the solar when the solar is not prod...
by BIMThoughts
Fri Mar 23, 2018 11:24 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

I created a PHP, MariaDB, and Python tracking program this week. I will be fully documenting it on the rover site this weekend, from start to finish. It seems like overkill for tracking uptime but it's the foundation for sending and receiving data from the rover to home base. Picked up a stepper mot...
by BIMThoughts
Sun Mar 18, 2018 7:18 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Did the first test run today and found a design issue with the suspension. After a bit of more testing, I will post a video and my findings. But it drives, a lot faster than I thought. It also used a bunch less current that I thought it would. .7 amps at speed and 1.8 Amps to speed from a stop. I al...
by BIMThoughts
Fri Mar 16, 2018 2:19 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Today is the big solar test day. Last night I hooked up two solar panels and 4 AA NiMh batteries up and powered the Raspberry Pi Zero W all night last night. This morning the Pi was still alive, if all goes well the batteries should charge enough to make it through another night. I am going to leave...
by BIMThoughts
Thu Mar 15, 2018 1:19 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Right now there are (6) 200:1 motors. I too am worried about dust. I am going to add a dust shield around them.

After taking a look at it this morning. I may need to change the single tube idea to a two tube idea. There is way too much wobble.
by BIMThoughts
Thu Mar 15, 2018 3:26 am
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Progress today. Got some more parts printed. IMG_0568.JPG The suspension is working and the diff is keeping it level. Need to work on the Servo Programming now and then get it rolling under it's own power. Right now I am using wood sticks, but the real version will be printed with PEGT and use Carbo...
by BIMThoughts
Sun Mar 11, 2018 11:33 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Spent the day redesigning after the test of the AA batteries and the Raspberry Pi Zero W. I am hoping that (2) of the solar panels that are producing up to 5 watts will be enough to charge the AA during the day. I made the rover body/pan modular, this allows me to add to remote sections as needed to...
by BIMThoughts
Sun Mar 11, 2018 1:26 am
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

More progress today. Lots of time waiting for the printer. Still missing two tires, but they will be here soon. Need to order 4 more for sandbox rover. I am waiting to receive the other order as I want to make sure they are the same tires and they are really not glued to the supplied wheels. Learn m...
by BIMThoughts
Sat Mar 10, 2018 4:51 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

I was finally able to get a mock-up of the rover suspension today. I am using Pink PLA because I have an unused 1kg spool. For the final print, I will most likely use white. Need to reprint the body section and wait for 2 more tires to arrive from China. before I can assemble for roll test 1. RoverS...
by BIMThoughts
Sat Mar 10, 2018 4:36 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Yesterday I started a real blog at Http://rover.bimthoughts.com where I will add more information including code and such. I also tested run time on 4 AAA NiMH batteries, I was able to get 21 hours of runtime. This is not too bad for cheap Ikea batteries, and if the solar can keep them charged I may...
by BIMThoughts
Tue Mar 06, 2018 10:39 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Counter-rotating Differential mock-up. This is the gearing that will keep the rover body "level" to the ground. It is mounted in a first draft print of a body section. Pi Zero in there for size. I have not decided on a Pi Zero or 3. I am starting to think that the Zero will be a better bet. Don't ne...
by BIMThoughts
Tue Mar 06, 2018 7:20 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Solar update. I was able to get the Pi to boot and run with (2) of these panels. http://amzn.to/2HbVecX they are 2.5W 5V/500mAh. I was also able to keep it running with only one panel in full sun. NOTE: this is an experiment, not a suggestion to get the panels above. I tested with a WiFi ssh connect...
by BIMThoughts
Tue Mar 06, 2018 4:36 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Yep figuring out power management and time to charge is all part of the learning curve. I am thinking of having about 7-9 watts of solar, so my plans for the size of the body have changed a bit. The body is a bit longer now. My printer (MOD-t) will only print 100 mm x 150mm x 100mm so I have created...
by BIMThoughts
Sun Mar 04, 2018 5:08 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

Progress Report.

I have started printing out parts. Why in pink, well I have a bunch of the stuff when I purchased my printer.
IMG_0527-1.jpg
IMG_0527-1.jpg (64.31 KiB) Viewed 3154 times
IMG_0528-2.jpg
IMG_0528-2.jpg (81.05 KiB) Viewed 3154 times
by BIMThoughts
Mon Feb 26, 2018 5:37 pm
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

Re: The Great Mojave Desert Rover

I did look at the Turtle Rover and signed up for the open source part of the project. It looks great. But I have the printer and the time to play, I guess that is part of the fun. I think of this project of an experiment of can I do this. So far the hardware and the mechanical side is coming along g...
by BIMThoughts
Sat Feb 24, 2018 2:14 am
Forum: Automation, sensing and robotics
Topic: The Great Mojave Desert Rover
Replies: 21
Views: 3434

The Great Mojave Desert Rover

Hello, first-time poster long time Pi'er Update: I have created a blog for this project: http://rover.bimthoughts.com/ The Great Mojave Rover Project is to build an autonomous rover that I can leave in the middle of the Mojave Desert and explore remotely. Design Considerations: * Utilizing existing ...

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