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I have a sensor that gives off 4 volts when actuated and I would like to transmit it a distance to a light. So I found these RF Link Transmitter/Receiver at 434MHz:

https://www.sparkfun.com/products/10534
https://www.sparkfun.com/products/10532

The data sheets and instructions I've read all suggest a microcontroller. What I'm asking is this:

  • For the transmitter side of my project (sensor that gives off 4V), could I use an Analog/Digital converter instead of a microcontroller to convert the 4V? Would the transmitter send that signal?

  • I do have an Arduino Yun that I could use for the receiver side, but lets say I didn't have an Arduino, what would I be able to use to convert the data from the receiver? A Digital/Analog Converter?

  • Last Question: Would I need multiple transmitters/receivers for multiple sensors?

Thank you for your attention and any insight would be greatly appreciated. Thanks again!

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  • \$\begingroup\$ I am assuming the is the same system you asked about in another question. I do not see anything in your system that is fundamentally analog. In practice the sensor has a yes/no output and the LED you need to light is either on or off. \$\endgroup\$ – George White Jan 29 '14 at 17:25
  • \$\begingroup\$ Yes it is referring to my other question, in fact I should have credited you for finding the RF Link. But the sensors give off 4V as a "yes" and 0V for a "no". I didn't think the Transmitter would send that signal. \$\endgroup\$ – user35653 Jan 29 '14 at 18:27
  • \$\begingroup\$ While it turns out not to be the problem you need to solve, simple schemes for transmitting analog values often use either a voltage-to-frequency converter, or a pulse-width modulator. A serial output analog-to-digital converter can be used, but requires tricky synchronization logic. \$\endgroup\$ – Chris Stratton Jan 29 '14 at 22:57
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You could use this chip. It's intended to be used with a radio transmitter and receiver (detail to follow). The chip has 5 inputs all of which can be transmitted and received/decoded individually. You only need one input/output so this should be relatively straightforward.

I'd use them with radiometrix modules like these - they are called TX1 and RX1

You don't need to convert the 4V into a digital number - just regard the signal as being "on" or "off" and feed it into one of the 5 input pins on the TX2 encoder. The receiver/decoder has an output pin that will minic the sensor pin.

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