adrian_sm wrote:Awesome. I so want to make one now.
Any plans to put a real throttle on it? I always found using the pot as a throttle on the servo testers pretty dangerous.
An average human wrote:well done on your scooter
i think i should warn you about the length of the leads between your battery and esc and lack of capacitors on the input to your esc, i personally ran in to trouble with this issue http://endless-sphere.com/forums/viewtopic.php?f=28&t=17675
anyway good luck
adrian_sm wrote:Cycle Analyst is cool, but if you want to go cheap, you can make a simple mod to the servo tester to run a hall throttle.
I have done this, really simple.
adrian_sm wrote:Np. There is separate adjustment for up and down. So no problem.
Just try it on the bench first.
fechter wrote:Great job on the scooter!
How hot does the motor get?
ferias77 wrote: I will try with only a push button and a potentiometer to choose the top speed.
adrian_sm wrote:If you want this sort of setup. I would keep the standard servo tester, and use that to set the top speed. Then cut the 5V leg on the pot in the servo tester and put your button in the break. Then I think you need to add a pull down resistor between the signal leg of the pot and ground, so it makes sure it goes to zero when you let go off the button. Then off course use the speed regulator thing.
That should do the trick.
adrian_sm wrote:Oh. I have been meaning to ask. How on earth do you stop? Only brakes I saw in your video was your foot. That almost scares me as much as using teh servo tester on it's own as a throttle.
adrian_sm wrote:I still have a nagging urge to build one of these... urrgggh... must finish other projects first.
adrian_sm wrote:The pull down resistor is needed to make sure that when the throttle button/switch is open, that the U1 =0V. Otherwise it is floating, and current leakage in the PCB can make it go positive. So even without the button pressed, you can get a throttle signal causing the motor to start. Not good.
Just place your switch on the red 5V line at the top, not the black 0V line on the bottom, and R1 will act as the pull down resistor.
ferias77 wrote:And I finished by coming to the limits of the machine : the pressure screw between the motor and the small sprocket in not enough.
Grinhill wrote:Nice work Eric. BTW - Is there something wrong with your video, I couldn't play it????ferias77 wrote:And I finished by coming to the limits of the machine : the pressure screw between the motor and the small sprocket in not enough.
This is a fairly common problem, and the best solution found by recumpence and other forum members seems to be drilling a "dimple" into the shaft a few millimetres deep at the position marked by the grub screws. Works better than filing flats onto shaft. Also, on final assembly don't forget to use some Loctite thread locker on the grub screws.
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