Active low transmitter question

[LEDave]

'the state will remain high till Vin is less than or equal vil where its guaranteed to go low'

So switching Vin LOW (from pic) causes a Tx?

And

Transmitter will continue to Tx until Vin goes High?

[Ioannis]

No. Only when there is a state change. We said that. Transmission happens on change once and only.
But you shouldn’t care at all. You should care only for your logic state. And maybe your voltage levels not to fry your module.

Ioannis

[LEDave]

'No. Only when there is a state change. We said that.'

Yes you did Ioannis, I'm just trying to understand the mechanism here.

'You should care only for your logic state. And maybe your voltage levels not to fry your module.'

The data sheet does say [High impedance inputs, LVCMOS/LVTTL compatible, 5V tolerant] would you say I could leave 5v on the Input pin to transmitter and switch to 0v/ground to cause a Tx safely? There are two module versions below, should I go for number 2 to be safe? Or is there a low voltage 12f683 that you know of, or is 5v fine?

1/ Part Numbering 2.4 -3.6V Version

2/Part Numbering 3.6 -15V Version

[richard]

Transmitter will continue to Tx until Vin goes High?

what you have is a lora long distance two way packet radio system that transmits the entire device state each time any input pin changes
to paired receiver constrained by the tx transmission time, that time is between 55 and 1002 mS depending on mode.
its not some cheap OOK thing

5V Tolerant is and means 5v tolerant , it would the least of you problem here

[Ioannis]

Also you can feed just 3.3 power supply to most pics. They work just fine.

Ioannis

[LEDave]

Also you can feed just 3.3 power supply to most pics. They work just fine.

Ioannis

Thanks for that Ioannis - I think 3.3v is the best option here.

I would love given time to learn how to send data with the LoRa module and pic but that's for the future and a lot more learning my end (end of Summer/Autumn/Winter project).

What I am after here, is to use the Tx/Rx as a switch at about 350m range so question:

Am I right in assuming that (once paired) a state change on say Input pin1 on the Tx would be reflected as Output on pin1 on the receiver (acting as a simple switch in effect) or is that far to simple?

what you have is a lora long distance two way packet radio system that transmits the entire device state each time any input pin changes
to paired receiver constrained by the tx transmission time, that time is between 55 and 1002 mS depending on mode.
its not some cheap OOK thing

Hi Richard - I appreciate that, its a pretty suffisticated and versatile piece of kit, I have a lot of learning to do before I can do it justice but as I say above, right now to get it to operate at 350m as a mirrored switch is all I'm after.

[Ioannis]

It does exactly that. Richard already told you so.

Rx reflects what Tx sees at the inputs.-

Ioannis