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  • Convert a Servo to Switch on and Off LED's

    Hi @ReedN2, I tried using this principle with a diode to drive a relay. The issue is that the power fed to the motor is pulsed, and at least with the servo I had the pulsing was slow enough that the relay would click on and off (something like 50 times a second I'd guess) which is really hard on the mechanical part of relays.If you want to control a relay with a PWM signal (Same control signal used to drive a servo) Servocity sells an "RC Switch with Relay" that should work and it's currently only $10. It's a 10 amp relay. If you need more current than that, I'd still recommend you get the 10amp one and then just use that to drive the coil of a larger relay. They have a board that runs a higher current relay but it's like 6x the cost of the 10 amp one and thus more expensive t...

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    Hi @ReedN2, I tried using this principle with a diode to drive a relay. The issue is that the power fed to the motor is pulsed, and at least with the servo I had the pulsing was slow enough that the relay would click on and off (something like 50 times a second I'd guess) which is really hard on the mechanical part of relays.If you want to control a relay with a PWM signal (Same control signal used to drive a servo) Servocity sells an "RC Switch with Relay" that should work and it's currently only $10. It's a 10 amp relay. If you need more current than that, I'd still recommend you get the 10amp one and then just use that to drive the coil of a larger relay. They have a board that runs a higher current relay but it's like 6x the cost of the 10 amp one and thus more expensive than a 10amp relay and a larger one from an automotive parts store. Alternatively if you need a cleaner solution you might be able to de-solder the 10A relay it comes with and solder in a new one, but make sure the coil current isn't too high or you'll run the risk of burning out the component that drives the coil in the existing layout.I know it's not as cool as making your own, but it'll probably work much better.

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  • Convert a Servo to switch on and off LED's

    That was my initial idea with this, but I only had a 5v electro mechanical relay, and the spring was strong enough that even with the high speed pwm pulse that would drive the motor on the servo, the relay would click open and closed every time the motor power pulsed on and off. Did you use a solid state relay or some additional circuitry to hold energy in the coil to hold it open even when the motor driver power was off in the servo?

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