 OfflineNewbie
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« on: January 02, 2013, 05:58:24 am » |
Hi,
Do anyone know how to use arduino to turn on a 120 V fan?
Thanks!
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« Reply #1 on: January 02, 2013, 06:37:59 am » |
I'd use a relay.. any old relay, or buy a breakout board with a relay on (comes with optoisolaters/diodes)
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Manchester (England England)
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Solder is electric glue
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« Reply #2 on: January 02, 2013, 06:40:15 am » |
Or use a solid state relay, they are called SSR
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« Reply #3 on: January 02, 2013, 06:42:30 am » |
Thank you!
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« Reply #4 on: January 02, 2013, 11:25:43 am » |
If it's a DC motor, you can use an SCR (Silicon Controlled Rectifier).
If it's an AC motor, you can use a TRIAC.
You can also use mechanical relays, or solid state relays, or Mosfets.
Since it's line voltage, might also help to have some physical isolation between your low voltage electronics and the high voltage section (for added safety). You can use "optical" equipped mosfets, etc... basically, your low voltage electronics turns on a small LED (inside the mosfet), and the light emitted is detected, which then switches/turns on the high voltage side of the Mosfet (everything happening internally).
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Johannesburg UTC+2
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« Reply #5 on: January 02, 2013, 11:35:06 am » |
Adafruit has this. Disclaimer... it says something about derating when the load isn't resistive and I think a motor is inductive? |
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IT Crowd:
Roy... "Have you tried turning it off and on again?"
Moss.. "Have you tried forcing an unexpected reboot?"
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« Reply #6 on: January 02, 2013, 11:41:58 am » |
Thanks for the link. That is pretty good pre-packaged solution.
For motors, use 20% of rated... so 15A x .2 = 3Amp max.
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Left Coast, CA (USA)
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Measurement changes behavior
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« Reply #7 on: January 02, 2013, 12:56:00 pm » |
If it's a DC motor, you can use an SCR (Silicon Controlled Rectifier). That is not true, a SCR will not control a DC motor as once you trigger the SCR on the only way to turn it off is to remove power from the motor circuit. Lefty |
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« Reply #8 on: January 02, 2013, 01:01:43 pm » |
If it's a DC motor, you can use an SCR (Silicon Controlled Rectifier). That is not true, a SCR will not control a DC motor as once you trigger the SCR on the only way to turn it off is to remove power from the motor circuit. Lefty You're right about the SCR. I was just thinking of turning it ON. |
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Anaheim CA.
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Experienced old Whitebeard with a Full head of Hair...
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« Reply #9 on: January 02, 2013, 01:11:55 pm » |
No... Not Quite... @Lefty What about commutation with an inductive load? <BFG>
Bob
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“The solution of every problem is another problem.” -Johann Wolfgang von Goethe
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Knowledge is proportional to the number of parts destroyed.
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« Reply #10 on: January 02, 2013, 03:06:13 pm » |
once you trigger the SCR on the only way to turn it off is to remove power from the motor circuit.
Lefty
Actually you can also turn it off with another SCR. |
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