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Recent Forum Posts

NE555 with solenoid

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...
Demon Today, 01:38

Re: InfraRed ramblings

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.
Demon - 16th July 2025, 23:27

Re: InfraRed ramblings

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, 16:38

Re: InfraRed ramblings

Thanks 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...
Demon - 16th July 2025, 03:24

Re: InfraRed ramblings

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
...
mark_s - 16th July 2025, 00:16

Re: InfraRed ramblings

ARGH! That's what they're called. :D I knew these existed, I just didn't know their names.
Demon - 15th July 2025, 22:53

Re: InfraRed ramblings

Search optical interrupter. These are used often for homing.
...
mark_s - 15th July 2025, 18:29

Re: InfraRed ramblings

There will be minimal light leakage. These will be on either side of a disk, as close as I can get them.

I plan on putting black heatshrink over the LEDs as close as I can to the rotating disk.
...
Demon - 15th July 2025, 03:35

Re: InfraRed ramblings

if there is any ambient light leakage a ir sensor like SEN-19018 would be better than a photo diode, with the bonus of making
led modulation unnecessary too.

if the distance between led and...
richard - 15th July 2025, 02:54

InfraRed ramblings

Using this 940nm LED set on Amazon: https://www.amazon.ca/dp/B01HGIQ8NG

Can I have the transmitter LED on without any pulsing? (resistor values are temporary, did not do any calculations yet)
...
Demon - 15th July 2025, 01:52