Electronics > Projects, Designs, and Technical Stuff
Remote push button switch (250ā buried cable) interface to uController
Jester:
I have a shed in the backyard that is about 200+ feet from the house. I have the need to trigger a microcontroller input in the house with a simple momentary push button switch located in the shed. Iām considering a simple opto isolator interface with say 20mA of LED current. Anyone see any issues with this approach?
Terry Bites:
A current loop on a shielded twisted pair is ideal. Ground Shield at TX end only, if you use the shield at all.
It seems like a lot of work, but if you already have the tp or stp...
Renate:
The 250' of buried cable is a big deal in terms of effort and cost.
Don't limit yourself. Today you want a pushbutton, tomorrow you might want 1GB internet.
You want duplex even for a pushbutton. You need confirmation that what you wanted happened.
Minimal: RS-485 half duplex
More: RS-422 full duplex
More: Cat6 with 4 pair
More: Fiber
beanflying:
EOP should work ok over that range for way less than digging a trench and cable (assuming you have power to the shed). Due to current circumstances I have had this from the house to the shack working fine at over 100' for several years now. Then you have a heap of options including feedback showing status of your device etc.
Circlotron:
What about a carefully aimed red laser and suitable detector?
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