USB adafruit trinklet mini > AC voltage regulator ~5W/230v motor?

hi folks.. i have this little project running..


what i have: adafruit trinklet mini with 5v ATMEL microcontroller


what i want/need: REGUALTE a small 5w MOTOR using 230v ! (i already have a mechanical potentiometer at 30k ohm attached directly AC.. BUT..)


i know so far with the atmel i can f.ex. control a digital potentimeter 50k ohm, at 5v.. -> only DC no AC (+ i wont get a 1Ampere on 5V working) ------> my little MOTOR uses ~ 22mA on 230V = 5W


 and what ive learned so far is that i might need one or two TRIAC or DAC combined with a POTENTIOMETER.. to control AC voltage

and/ or an OPTO-ISOLATOR --never heared of that before..

but i have no idea how i should solder that together or will i need some extra RESITORS or CAPACITORS for it?


-> FINALLY i want to flash the ATMEL with a small arduino code and use a USB connection (+own software) pushing the potenial (resistance in the curciut) from 0 to 50k ohm into AC !

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iceng6 months ago

First find the motor ! Because I do not believe a 5W 230v small motor exists..

Then post the URL, so we can help to design a working safe electric circuit to control it...

In the meantime you take should take these free classes;

sblocc10 (author)  iceng6 months ago ive checked some sites that states that its an 12v 5,5W motor AC and it includes a transformer converting ac 220/230 to 12v ...

so would this be possible to dim using an electronic curcuit ?!?

may the waveform be disturbed becuase being converted to 12v anyways???

sblocc10 (author)  iceng6 months ago
thats difficult because its sealed away in a BOYU EF-05 aquarium filter..
but i strongly assume it has some little transformator integrated as well, and might be DC 5W... however i must set the voltage using AC curcuit...
sblocc10 (author)  sblocc106 months ago

well, checked these lessons, funny thing, theres nothing i didnt know before..

anyhow.. triacs, dacs and opto-isolator are still a miracle to me.. :)

iceng sblocc106 months ago

OK, I took apart such a filter pump some time ago.

The motor is an AC line voltage simple induction submersible motor.

There are three ways to control the speed and thereby water flow rate.

1) Change the line frequency == too complicated and problematical...

2) Lower the applied power == a resistor or inductor or Triac will all work but the induction motor speed response is not linear and may stop at unexpected times to the detriment of the aquatic animals..

3) Pinch the water flow tube == is highly effective on a centrifugal load and will not damage the motor

Downunder35m6 months ago

Before you go overboard:
Not every motor can be adjusted in speed by a potentiometer and using PWM control only works for a few types of motors.
The first step would be to confirm the motor type and by what means the speed could be controlled.
Only once that is sorted and possible you can thinking on to include an Arduino into the mix.

sblocc10 (author)  Downunder35m6 months ago
i have no idea.. its for an aquarium filter that has no speed option.. but i can slow him down using either 10k res. 20k .res. both combined or with an analog potentiometer all rated at 4W connected in series directly in the AC loop !!!

from my view it has 10k ohm on its own 5W/230 =22ma*230=10.000

so i can trim it up to 50-33% power and still runs (adding 10-20k), when i go for 25% it s off (adding 30k) and from 22k on it got an sudden drop in speed, only moving water at no speed but as i can see i t must be moving.. but not related to power ratings..

Then why not simply use a dimmer?

sblocc10 (author)  Downunder35m6 months ago

an analog dimmer..? thats what i´have..

i want to build an USB AC dimmer.. how to do that one??

sblocc10 (author)  sblocc106 months ago

+ i know that electo motor thing with the waveform being cut in half or so.. and the inductivity... somehow.. :)

but is there a chance you think?

its not a big deal if not but would be nice to have that whole concept i made up anolog using digital components and put current on the fish (*lol*.. the water) (...) no .. haha .. on the filter - using my computer !