Universal motor speed control by a microcontroller (arduino)

I am showing a method of using a CdS photoresistor to control a standard triac dimmer circuit that is wired to an electric drill motor (a universal motor). The CdS photoresistor is driven by an LED that is controlled by a PWM pin on an arduino microcontroller. This system provides a very easy way to control 120V AC devices with a single PWM pin, and not use any timing code or method to detect the zero-crossing of the AC power since this is done intrinsically in the circuit. It also offers true electrical isolation between the AC line voltage and microcontroller.

Duration : 0:5:26


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17 thoughts on “Universal motor speed control by a microcontroller (arduino)

  1. great video…. i …
    great video…. i was wondering could you give me the circuit diagram of that speed control. also what? should be done to adapt it to 240 volts and connect higher loads like 1.5 hp.

  2. Maldita? At&t me …
    Maldita? At&t me throttleo mi cell y ni siquiera puedo ver este video con esta lentitud de internet fuck. Att

  3. I would like to …
    I would like to control? a dual winding stepper motor that runs a breadmaking machine um its rated at 240 volts at 100 watts I think your solution would be great for that as the one that came in the machine broke down after 3 days and my arduino was sitting on the self so why not use it for the breadmaker 🙂 and it should work as most drills are about 500 watts. Once again good solution !!!!

  4. Doesn’t? the CdS …
    Doesn’t? the CdS photoresistor really is too slow for such application?

  5. Awesome!! I need? …
    Awesome!! I need? to regulate 4 drill motor, so this way it can be done easily with just one Uno 🙂 Thanks man!

  6. I’d like to …
    I’d like to experiment with this and use a vactrol to replace the CdS.? It is a packaged version of what was hacked together in the vid. A VTL5C3 can handle 250V.

  7. is that? microchip …
    is that? microchip controller is easily available or need to buy from you, easy to use. plz

  8. how much cost it …
    how much cost it will required to buy this microchip controller. can? we use this in Ac motor? DC motor is not able to bear the load .. plz reply

  9. I agree with Hector …
    I agree with Hector – what’s so hard about triggering a TRIAC? You can measure the zero crossing with a zener diode and then start a timer. As far as projects that? use a microcontroller just to generate a PWM signal – that seems like a Rube Goldberg way to solve a problem. Didn’t people use 555 timers for that sort of thing once upon a time?

  10. ok, thanks for? the …
    ok, thanks for? the reply, i guess i’ll have to dig in and do a little more research abou it.

    Best regards.

  11. hi, i just saw the …
    hi, i just saw the video and at the moment i see myself in the need of making a? dc-ac 3phase inverter and i think i can do it the way you did for controling one phase with some modifications, could u send me a schematic or at least the reference of the conponents?.

    Thanks

  12. What’s so complex …
    What’s so complex about the other TRIAC method? An H11L1 is like 80 cents and in conjunction with a MOC30xx is designed specifically for phase control applications (see app note 3006). Seems like you’ve moved the complexity to your LED/cds concoction and basically built your own optocoupler LOL. Hey, it works, just seems like you went to a lot of trouble to avoid 1 extra semiconductor and a? few lines of code. Was it because you felt the PWM would be more reliable or were uncof. with interrupts?

  13. simple, brilliant …
    simple, brilliant solution. This is actually very helpful for a few projects I have in? the works. Thank you so much for posting this.

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