Any good electronic switch?

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#1
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Hi,

I need to join two points to activate a TV remote controller, however, I need an atmega328 to "tell" the electronic switch when to join both points. Just by applying voltage to the switch.

What do you recommend me? Please specify the model so I can look for it on my local electronic store.

Thanks in advance

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How about the venerable "4066" CMOS switch? It comes in 74HC4066, 74C4066, CD4066, and probably several other versions.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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Are you actually sending an analog signal or just a logic through this switch? If you are just sending data a 74LS00 gating circuit will do the job just as easily,
if analog Jim's suggestion is best.

Charles Darwin, Lord Kelvin & Murphy are always lurking about!
Lee -.-
Riddle me this...How did the serpent move around before the fall?

Last Edited: Sat. Jul 10, 2010 - 05:35 AM
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i am not pretty sure, but will a bare transistor with proper biasing suffice in this case?

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It is quite possible that you can. In fact you may not even need need a transistor, two diodes might be able to do the job. But we need more information about the circuitry that you are trying to connect together!

Charles Darwin, Lord Kelvin & Murphy are always lurking about!
Lee -.-
Riddle me this...How did the serpent move around before the fall?

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not for a specific case, how to do it with diodes.

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Most tv controllers scan the keyboard as a matrix. so the 4066 works a treat in these circumstances. Make sure you join to AVR 0V to the controller 0V.

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Yes, I believe Kartman has figured out what you are trying to do, emulate a remote control switch.
As suggested 4066 or a small relay http://www.futurlec.com/RelDip.shtml will do the job.

Charles Darwin, Lord Kelvin & Murphy are always lurking about!
Lee -.-
Riddle me this...How did the serpent move around before the fall?

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If you are looking at a scan matrix, one side will be a output (scan line) and one input (sense line). So if you connect the two lines to the AVR, and pull in sense line low when the scan line goes low there is a good chance it will work (make sure to share the same Gnd).
Make sure that your output is an input when not used, otherwise you will "kill" the matrix.

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Quote:
Most tv controllers scan the keyboard as a matrix. so the 4066 works a treat in these circumstances. Make sure you join to AVR 0V to the controller 0V.

I did a similar thing for multiple keys using a pair of 4051 multiplexers with their common I/O pins joined. One 4051 went to the Rows, the other Collums.

This way we could simulate an 8*8 keypad with 7 I/O lines.

Ron.