Simplest, most reliable way to remotely trigger Arduino

Projects General Guidance
1

So, here's the scenario:

I want to have several Arduino's about 10 feet away from me. They'll all be sitting there, waiting for a 'Go' command from me. Then, they'll each execute their programs in all of their blinking glory.

What I need to know is what is the best, easiest, most reliable way to send that 'Go' command. Presume that I won't necessarily have line-of-sight, and that I'm looking for a wireless solution. All I need is that one 'Go' command - I don't need anything else more fancy.

Suggestions?

2

There are motion sensors and mics that can integrate with the Arduino.

3

Wireless generally means "complicated and unreliable".

4

jremington:
Wireless generally means "complicated and unreliable".

LOL. OK, I'll settle for 'least complicated' and 'most reliable'.

5

Twisted pair wiring fits those criteria nicely!

However, using different power supplies on different Arduinos can lead to a ground loop problem, easily solved by using optoisolators.

6

jremington:
Twisted pair wiring fits those criteria nicely!

Forgive my newbiness - that isn't a wireless solution, is it?

7

A 433MHz radio module will be very simple. Basically the same as a garage door opener. You should only need to pay a few bucks for each unit. Cheaper than wires.

8

The nRF24L01+ transceiver modules have a lot more capability than you require but they are cheap and work well. Have a look at this Simple nRF24L01+ Tutorial

...R

9

I'll settle for 'least complicated' and 'most reliable'.

=wired, which, given that wire can usually be obtained for free, is also cheapest.

10

There's also IR. It saves the hassle of making a transmitter because you can just use a TV remote.

11

aarg:
There's also IR. It saves the hassle of making a transmitter because you can just use a TV remote.

IR feasibility will depend on how well the signal can bounce its way through the "not necessarily line-of-sight" path.