Let's Make Robots!

TrackFlip

Drives About at high speed knocking things over
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Track_flip_0_1.zip2.19 KB

This is my latest tracked robot TrackFlip this little robot is excessively powerful hence the name. Full power on grass always seems to end in wheelie or a back flip / cartwheel this was an unintentional feature but rather exciting its not strictly a robot yet being still remote controled but its a start!

Im planing on getting it avioding obsticles or at the very least stoping when anything is in its way eventualy i would love it to be fully autononomous 

update

just finnished a bit of a rebuild.

glued sqaure repair washers as the case had started to bend a bit

now using an arduino uno and new code now no buzzing from the motors planing on some kind of wheelie holding code with a accelorometer and tilt sensors

Picture's

pictures

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Adding pulse width modulation (from the Arduino) to the motor drives should allow you to slow the speed down to a manageable level and still have enough power. It looks like you may already have the hardware for it.

I am using pwm to drive the controller on pins 9 and 10 I am still quite new to arduino code so its slow going but its getting there. I’ve re-wrote/copy-pasted the code using a useful post I found on instructables for the lawnbot400 and swapped the pins about to the shields configuration and removed parts I didn’t need its a lot smother now still dangerously fast but I like that

At the moment im working on getting the current sensors built into the shield to give me actual reading in amps so I can do work out the limits and add some kind of over current shut-down so the tracks coming off and binding up wont burn anything out its only happened a couple of times one instance a rock got caught up inside the track but thankfully noticed quickly 

then the next step im going to hook up an accelerometer & gyro to calculate the angle whilst accelerating and hopefully be able to reduce the motor pwn rate to hold wheelies for as long as possible maybe even balance on one end like a segway after that im thinking of some kind of traction control for use on hard slippery surfaces like wood and tiles as it is the tracks spin up quite a bit before it actually moves a lot of the time

I will post the code up later its not pretty or all original but I could help others out a bit

 

terrific, I like that car !!

What causes that?

Overall, good start on a mobile platform. Better yet I see you are already using an arduino shield to control the motors. That will definitely help when you decide to start making it autonomous.

i think it was the adjustment on the transmitter being a bit off theres almost no deadband before it starts moving and probably the tension on the tracks could also be a factor there not quite the same.  I did some testing with both motors wired together and i drove in a fairly straight line untill it hit a bit of gravel or simmilar so im fairly sure the motors dont have advanced brushes.

Can you take some detail photos because have made one just like that but using a Sabertooth 25x2 motor controller but i don't know how to mount the wheels on the drill so if you can help me

hope that helps these were budget drills so hopefully a common design but there may be differances from make to make

How did you mount the motor? I have mount my motors with the screws of the front but i am worry that this conetion becouse it looks a litle bit weak 

to attach the motors i screwed bolts into the plastic holes making sure they were the correct length to also lock the torque limiter but this is not ideal as i tore the threads out or one motor crashing into a wall when i was only using 2 screws  im looking for a way to mount them better! for the time being ive got 4 screws in each motor that ive cut down and filed to the correct length and its holding up ok so far

Cool i used the spring and front bolts that secure the torque control to secure it.It acts like bumpers and put the torque at it max.

Arduino cool i want to put gps control on mine but i need to wait for the knolege needed to make it. :)