Controller question [TANKS]

[Michael Brix Husted Henriksen <mbhh-at-mbhh.de>]

Hi Guys

Proper Electronic Speed Controls that have forward/reverse (h-bridge) 
are very expensive when we want the to pull high amps. A forward only 
ESC is simpler and cheaper to do. My idea is to use relays to switch 
direction. They would be placed between the ESC and the motor. Doubling 
up on automotive relays would ensure that they will handle the current. 
At center stick the relay should be off and the motors switched for 
forward motion. Move the stick back and the relays switch to reverse and 
the ESC comes on after a little stick movement. Some of the R/C aircraft 
ESCs are amazingly resilient and have "over-cooking" protection built in 
while still being affordable.

It would probably need some PIC programming to do perform this and make 
sure the relay switches before the ESC comes on again. Because the 
relays are switching at power off, there should be no sparking.

Is there such a PIC or other MCU software already in existence?

I realise that there is little need for speed control in battle but I 
would like to be able to drive the tank around a bit and perhaps pull my 
daughter on her bike so an ESC would come in handy.

Best regards

Michael




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