I need to provide a ground for a TX118SA-4

Other Hardware General Electronics
1

Hi.

I have a device, a TX118SA-4 transmitter. To make it send a signal one of the four inputs needs a ground.

In all the information I've seen this is provided by a switch. However I want it to be operated by an Uno.

My dilemma is that when the pin is not at zero it will be at +5V. My concern is that the +5V could damage the TX118SA. I just do not know.

Any thoughts on this please or suggestions.

Thanks

2

How have you got it wired up, please supply a proper schematic.
Have you looked at the data sheet for the transmitter? What voltage are you powering it with.

You can also set a pin as an output, outputting a logic zero. Then make it into an input and pull the pin to what ever voltage you want ( up to the power supply of the Arduino*) with a pull up resistor to the voltage powering the transmitter.

  • that is the power supply of the chip not the voltage applied to an internal regulator.
3

Hi Mike,

Ah, yes I had not thought of that. That may solve my concerns. I'll have a think.

Thanks.

No I do not have it wired up, I do not have the TX118SA-4 yet, still in the post.

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No idea how to make a proper Schematic so I have cobbled together this image..

Ground and +5v fron UNO to power the TX and then a digital pin to one of the TX's inputs to activate it.

The only datasheet I found was Chinese and told me less than instructions from sellers such as this one.

So instead of using a push button I'm hoping to use the digital pin.

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Thanks Roy

4

Hi Roy,
If you are wiring the transmitter to 5V then there will be no issue in sending it 5V on the pins. So no need to do that trick, just wire it straight.

5

Thank you again Mike.

My TX should arrive soon so I'll have a look with more confidence.

Roy

6

Hello Mike, my TX and RX arrived, I wired it as you suggested and it does work find.

Thanks Again Roy