I’m using this circuit.
When the button is pressed, the relay switches on for one second and then turns off.
It doesn’t matter whether the button is pressed briefly or held down - the circuit...
I'd like to activate a solenoid for a brief moment. Does this timer look correct?
9978
- I added a large cap alongside the solenoid; value is just preliminary.
- the opto is to isolate the...
Yeah, these are unipolar steppers, not bipolar.
I'm using the ULN2003 as driver that came with them. I'll be switching to a ULN2803 for my use.
I bought some of those stepper motors you linked above. Really cheap, small with a gearbox, but be aware they are wired so you cannot use them with a standard stepper driver module. These have five...
mark_s - 16th July 2025, 16:38Thanks Mark!
I was considering laying a limit switch flat along the outer edge of the disk, and use a notch to catch the limit switch roller. But I'm liking the hall sensor even more:
- no...
You can also use a hall effect IC and a small magnet. The hall effect ic's come in a 3 pin TO-92 package and are easy to interface to your micro.
For example
...
ARGH! That's what they're called. :D I knew these existed, I just didn't know their names.
Demon - 15th July 2025, 22:53Search optical interrupter. These are used often for homing.
...
Re: NE555 with solenoid
Of course. By changing the resistance R3, or the value of the capacitor C1, or a combination of both.
louislouis Today, 12:04