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adamc wrote:i am also working on an arduino controller speed and points unit.
this one has the addition of a motor driver for £4 . it has a slider for the speed and works the locos on the test track really well and it is PWM . The arduino controls 4 points and i'm working out if it can also switch the loco shed doors open as well. Really cheap, combines speed of tortoise and PWM control all in one for the price of four £4 mini servos, the arduino and the switches
The points are driven by mini servo with a nice slow speed compared to the 555 before. All running from a reclaimed 12V wifi router plug/PSU combo and a simple 78010 voltage regulator. Slow speed is pretty good, and working on the code to give them a 50% boost to get them running before setting back to slow speed.
All I want to do with the servo is to control a dumping mechanism for skips.
Just Up and Down to dump them.
I LOVE this solution the best:
Even simpler would be to just hook up a dpdt momentary contact switch directly to the motor leads in the servo, bypassing the servo electronics. If you keep the voltage 5 v or below, it wouldn't burn out a servo motor.
I will buy a cheap servo and start experimenting. Any good idea for a low voltage power source?
adamc wrote:That's the very circuit in fact, just replace the fixed resistors next to the push button with 100k trim pots so that you can adjust the end points. I also used a center off DPDT momentary switch. So its On-Off-On.
I also used the other set of contacts on the switch to run the power through as well, so that it only powers the servo when needed and isnt on all the time as it can tend to buzz/hunt.
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