An enhancement to my recent pond pump project - pump speed control!
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https://github.com/RalphBacon/255-Che...

Having installed a pond pump there came the inevitable "upgrade" request: "Can we make the pump more controllable?".

Well YES, we can, as it happens.

Products
Any PWM controller will adjust the speed of a motor like this. But I couldn't face building one, so I bought a cheap one off the Internet (Amazon UK, actually):
https://amzn.to/3Be0Z8p

You can get them cheaper if you are prepared to wait for a while, see this one from AliExpress:
https://s.click.aliexpress.com/e/_DBf...

Identical products (apparently), just a different price. Pays your money, takes your choice.

I found a video on YouTube by @RJ Imagination that demonstrates the same circuit (pretty much):
   • PWM using OP-amp | how to make pwm us...  
https://www.circuits-diy.com/pwm-puls... (his article)

► More info in my GitHub:
https://github.com/RalphBacon/255-Che...

I also found a circuit diagram for a 555 Timer PWM too:
https://www.build-electronic-circuits...

A reasonable MOSFET for use by Arduino users (ie a 5v GPIO voltage) not suitable for ESP32 use (not without a level shifter):
https://www.infineon.com/dgdl/irl540n...

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► More info in my GitHub:
https://github.com/RalphBacon/255-Che...

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