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Hello all, I am getting back in the saddle making robots now that I am moved into my new home and settled into my new job as a technician maintaining the Fiber Optics network in Chattanooga TN.
IM BACK !
By jstarne1
— Last update
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I have been trying to use the Sabertooth 2 x 12 simplified serial mode with Ezb tiny and keep having an issue. For example I can click the forward arrow and the wheels roll forward. Great! check. Then click reverse and one wheel turns forward.... what the heck? Similar strange issue when left or right. There are only 4 terminals, so there are 16 possible combinations. So I swapped them around and wrote down the configuration as I go to make sure I had no repeats. I just got more crazyness. So I went back to the original wiring that worked on the forward command and swapped the EZB for a RC Reciever and swapped from Serial 9600 to RC servo input mode and it worked great. To be specific is was mixed control where one servo control is forward/reverse and the other left/right turning. So the only think I can think of is to do a Movement Panel with servos. For now this will allow me to work out physical build.
Any help is great! I need a Movement Panel working with the RC mode since serial is giving me an issue, or if you can think of what the heck is going on with serial.
Are you using one sabertooth for both wheels, one motor for each wheel and attached to a different channel on this sabertooth? Looks like this from your picture. I have this setup for the DC elbow motors of my B9 robot's arms. However I'm not using a Movement Panel but using EZ scripting to send simple serial commands to each channel to move the motors independently. I found that if I send the two serial movement commands for each channel to the sabertooth to fast that the second command to engage the second motor on the second channel won't run. I found that placing a short sleep command between the two serial movement commands helped the second serial movement command to get through. Hope that makes since.
Also (I haven't tried or confirmed this), but if you have two sabertooth's try moving the second motor to the other sabertooth. I have a feeling that one single sabertooth can't process the the serial commands as fast at the EZB can send them and causes the second command to get flooded out. If you split the motors to two different sabertooths then each one can process the command on it's own and as quickly as it's received.
Hope this all makes sense and helps.
Oh FYI shortly after this project is running I am submitting it to The Home Depot/ Ryobi DIY competition, 2500 grand prize
This is thick plastic , .25 inch I believe. It is he same thickness at the steel that was there for the anti tip wheels. I made them extra thick to compensate for being a plastic replacement over steel. I cannot flex this by hand. After dinner I will drill the holes and start bolting things together for an initial test in the driveway.
https://m.youtube.com/watch?v=qnpVartMoXc
Youtube video of the first attempt mowing with the bot
Points of interest
- there are no screws on the mower body for easy access at the moment which makes it bounce around a bit
-I am still using the 40 v battery packs but the step up converter is going to be installed to boost the voltage from the 24 volts to 40 volts for the mower motor. This will lighten the assembly and also consolidate batteries. two car batteries last a lot longer than a 5 ah battery.
- the rear of the mower is sliding accross the grass, I still need to make knotches in the mounts to adjust the height of the mower deck.
- I was using this in RC mode and trying to record as well.
- the grass was about 8-10 inches tall being cut down to 1.5 inches so the mower could not mow as fast as a normal pass would be.
- First person cam will be added so I can mow from inside the house.
Comments and suggestions welcome ! thanks
Way cool mower. Thanks for sharing.
Click To Watch Video
here is another mower TOADI