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hi
i was wondering is it possible to make your own speed controller for £20-£30. Is it possible to use a tamiya 3 terminal speed contoller on 2 12v drill motors.Also i have heard people make there own speed controller from their drill triggers . How is this done ?
Ali
Ask cavecrusher.
he can provide pictures and a guideline.
You can find him by asking on the Dutch forum.
http://rw.bugs.nlhttp://rw.bugs.nl
Ali, didnt you buy an IBC? Also I would definately not advise Hobby speedos for robots, most (if not all) of them arent designed for the job. Best stick with Electronizes as the cheapest RC speedo.
There are loads of ways you could make servo-operated switches or even servo operated potentiometer but you wont get very good performance at all compared to a mosfet/H-Bridge circuit.
Ewan you are correct i did buy a IBC i just wanted to know if theres a way to make cheap speedos for my upcoming projects. Any diagram pictures would help
Ali
http://www.kleefeld.freeserve.co.uk/model/barry/pic01/rc_speed.htmhttp://www.kleefeld.freeserve.co.uk/...1/rc_speed.htm
http://www.mcmanis.com/chuck/Robotics/http://www.mcmanis.com/chuck/Robotics/
http://www.shucksmith.com/page-forklift-hbridge.htmlhttp://www.shucksmith.com/page-forklift-hbridge.html
ok i think i know how to build one i need 2 x SPDT relay , some micro switches and 2 servos .Am i correct ? Will this work? How do i wire it up
Look at a few sites on the net to find some schematic diagrams of how the relays wire up. You will need to mount the servos in a good position to switch the microswitches and you might find strip-board, available from places like maplin, useful for the relay mounting. Obviously that would only be classed as an RC Switch rather than a speed controller.
Im experimenting with this at the moment and thanks to everyone in the robot community thats helped so far. When Ive finished Ill post everything online including the pic code and means to download to your pic for pennies. So far Ive made a simple 5Amp weapon switch using a PIC for under a fiver. A beefy weapon pic controlled Rx switch (40A) for under a tenner, a single channel speed controller 30A continuous using PIC/H bridge mosfets for about £12. Im still developing a single board two motor controller with 8 mosfets and two pics that hopefully will cost only about £35 to make. Why am I doing this? I run the Young Engineers Club at my school and my students need cheap stuff! And Im sick of seeing kids have to shell out £75+ for decent speed controllers.
Ive spent the last four days building prototypes and the pile of dead components is growing :sad:
Ill put up all the How to stuff on my website when its sorted, including the PCB masks.
Are you using H-bridge driver chips run by the pic by any chance? It helps greatly to use an extra 10v to the upper n-channel mosfets while switching. The standard for motor controllers like this seems to be the HIP chips
Regards, Ewan
http://www.micro-maul.co.ukhttp://www.micro-maul.co.uk
http://www.picaxe.co.uk/www.picaxe.co.uk/ this looks good is this any use? also http://homepages.paradise.net.nz/bhabbott/esc.htmlhttp://homepages.paradise.net.nz/bhabbott/esc.html