Simple hold button radio signal setup range minimum 20 meters - what to choose?

Projects General Guidance
1

Hi

So I am a little stuck with a very simple project. I need a few pointers to which direction to go.

What I am making:
3 tranceievers(or T to R) to be mounted on a handle, and when the button on the handle is pressed, i want a relay to activate as long as the button is pressed. Now, i have solved everything regarding the relay etc. And I have solved a version of this only using Arduino's (between UNO and Nano). BUT, Since this is really simple, I want to use a AtTiny85, that I bootload myself, if necessary.

  1. What radio transceiver/receiver/transmitter should i use (simplest to code and uses fewest PINS)?
  2. and can i do a simple atTiny85 setup?
  3. Also, can i send FROM attiny85 on the transmitters, to Arduino boards?

I only need some pointers. Not a complete guide :stuck_out_tongue:

Thanks :smiley: :sunglasses: :nerd: :smiley-nerd:

2

fatalot:
i want a relay to activate as long as the button is pressed.

You should send a message when the button goes down and another message when the button is released.

BUT, Since this is really simple, I want to use a AtTiny85, that I bootload myself, if necessary.

The Attiny85 only has 6 I/O pins and if you need 3 pins for buttons you won't have much left for communication with the wireless - however one of the wireless systems that communicate using Serial might be suitable such as a HC12.

I use an nRF24L01+ wireless transceiver with an Attiny84 (which has more I/O pins) but it may be overkill for your project.

What distance must the wireless signal bridge?

It's much easier to give useful advice if you provide a full description of the project you are trying to create.

...R

3

Hi

Yes, but i don't want everything served, since the learning part is the fun part... :slight_smile: I just don't want to make stupid early decisions in tech choices.

It is only to be used indoors at sports events, so 30 meters effective range (which probably means, 40 meters range to be sure).

Ohh, the attiny84 is a good idea. :slight_smile: I do have the 328's also, but that would defeat the purpose of... making it smaller. Yet still better than using a "huge" Arduino board :smiley:

I will look into the difference of coding to the nRF24L01 vs. the HC12. And how many pins are required. Also i found the 433mhz (https://www.amazon.com/433Mhz-Transmitter-Receiver-Link-Arduino/dp/B016V18KZ8) - they hardly need any PINs. The library looks a bit complex and i am not sure it will go with attiny85/84

thanks for the feed back. :slight_smile:

4

I forgot to include this link in Reply #1

Simple nRF24L01+ Tutorial

This is my combination of an Attiny84, and nRF24 which I use for radio control in a model train.

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...R

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5

Also i found the 433mhz (https://www.amazon.com/433Mhz-Transmitter-Receiver-Link-Arduino/dp/B016V18KZ8) - they hardly need any PINs. The library looks a bit complex and i am not sure it will go with attiny85/84

The use of 433mHz limits the transmission time to a few milliseconds per each second of time, by law, if not in the electronics.

Paul