Timeline for transmitting 5v signal over a long cable
Current License: CC BY-SA 3.0
9 events
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| Feb 5, 2013 at 14:32 | history | edited | Anindo Ghosh | CC BY-SA 3.0 |
Added link to "dead bug construction" on Wikipedia
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| Jan 17, 2013 at 17:10 | comment | added | Chris Stratton | This is probably overkill for the application in question, though as mentioned there are applications where the extra cost and complexity is warranted. | |
| Jan 17, 2013 at 16:56 | comment | added | John U | Some google/wikipedia search terms for you: MIDI, DMX, RS-232, RS-485, RS-422, 20mA current loop, differential signalling. | |
| Jan 17, 2013 at 16:05 | comment | added | Phil Frost | @CodenamedSC: search "midi microcontroller" or "midi schematic". Thousands of things out there. Another direction for further research is current loop, MIDI being simple example of such. | |
| Jan 17, 2013 at 15:54 | comment | added | Codenamed SC | @PhilFrost any link will be helpful | |
| Jan 17, 2013 at 12:40 | comment | added | Phil Frost | I suggest you look at MIDI for real examples of this technique. Plenty of tutorials out there for interfacing with MIDI in both directions. | |
| Jan 17, 2013 at 9:07 | comment | added | John U | Opto on the micro end is definitely the more elegant idea, I'd be paranoid (experience with telecomms / lightning / EMC) and add a couple of protection diodes/tranzorbs to save the opto from stray/reverse/over voltages. In general it's preferable to send a bigger signal down the line (send 12v and deal with it at the micro end) rather than start with a small signal and struggle to receive it reliably. It may also help your cause (noise immunity) if your sensor can drive some current down the line, EG through a 100Ohm termination resistor. See RS485 / RS422 standard for examples. | |
| Jan 17, 2013 at 9:04 | comment | added | Vladimir Cravero | this is probably the best solution, but if the cable has a ground conductor I do not think the potential mismatch would be significant. I'd try a resistive divider, that's the simplest solution, or the zener solution below which is even more precise. | |
| Jan 17, 2013 at 5:22 | history | answered | Anindo Ghosh | CC BY-SA 3.0 |