Fusion
Member
You guys try Plasti Dip spray on the tires? Might be enough to last a few runs and cheap enough.
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Sounds like you need some miniarachnids , gotta see this thing throughStill waiting for more parts for my steering linkage.. They were cheap enough and I ordered extras so if one servo doesn't cut it, I can go to a dual approach.
I decided to ditch the stock battery, as much as I like to keep it clean, the BMS board has been a pain to hack. I'll probably end up gutting it and filling it up with cells.
In the mean time, I 3D printed these... They're 4S5P packs made with genuine Tesla cells.
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I got the motor controller hooked up and working with a basic RC receiver. Just need steering now and I can get to programming all the autonomous functions.
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I'm going to have to find another approach for the tires. Unfortunately my 3D print of the TPU tire failed after 30 hours and going though 1/3 of the spool. The 95A hardness doesn't have enough grip IMO anyway. Softer filaments are available, but they're significantly more expensive.
Autopilots installed and she's driving! Traction is non-existent, especially with no weight in the car. Still waiting on my RTK module for cm-precision GPS, but I can drive around with the remote now.
Steering servo is plenty strong, I need to grind off the limit pins so I get a bit more steering range.
Ordered sonar sensors, so should have obstacle avoidance coming soon.
Next steps, 4G and camera, then I can try an autonomous drive down the park path.
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Brilliant!
What is the circular thing you've mounted on the hood though? Some kind of antenna?
Good to hear that the servo works well, I might go down that route as well now that I know it works. Do you have a link to that servo?
My daughter has been digging her new Radio Flyer model S, but as is typical for these types of toys, the plastic wheels have poor traction and the throttle is really just an on-off switch. There are many people that modify "power wheels" toy cars with rubber tires and variable throttles. I'm ready to try. Anyone want to help? I'm in Maryland, but think we can do this online. I have access to a small machine shop and a 3D printer.
Wait you’re just using the two HS-7954SH‘s? I have a 470oz servo on my rc 4x4. I may just buy another one and take it out of the truck. Thanks againSteering works pretty good with the dual servos. I was going to use a linear actuator, but anything under $500 was too slow for the speeds I want it to run. Parts list was posted here, I pretty much stuck to that original plan.
Update on my project: I tried breaking open the "gas pedal" and finding some way to control it, but no luck there.
The problem is that you can't just run the motors directly of the battery, as said before it needs to communicate with the pedal microcontroller to give sufficient current. Right now I'm trying to somehow hack the battery into giving out enough current anyway.
Summarized:
- Battery needs signal from gas pedal to give sufficient current for motors
- Thick green wire out of pedal connects to negative side of motors
- Thick white wire out of pedal connects to positive side of motors
- Thin red and white out of pedal are positive and negative of headlights
- Battery contains 16 cells, I think it's 4S4P