I'm working on a project with my daughter for Halloween. I want to automate the movement of Halloween decorations. So, with the help of Joan, pigpio and some very helpful members I have managed to get multiple servos working, I've figured out how to get motion sensors (working on range sensor), LEDs etc working (I'll put a lot more effort into learning more about everything I've done later)
As my 5 year old is the brains behind the operation, we have come up with some pretty creative ideas. What's she's describing takes it beyond simple motion sensing triggering movement! What I want to do is be able to have multiple devices able to communicate, so if I have a device with a motion sensor at the end of the path and on the lawn to the other side, things closer to my door can know what is approaching and from where.
My thought is to have multiple pis (I have an A and 2bs) running off battery packs (also have a beaglebone and Arduino Uno if they can play in there) with the right sensors communicate back to the device that's in control of servos, lights etc. But, I'm not running Ethernet across my lawn and having hubs sat outside, so I was wondering if there was any recommendations on how to make devices wirelessly communicate. I've seen these little RF modules on Amazon for like $5, ZBee? My front lawn is about 75ft by 25ft so all the devices would be somewhere in there. I'm a developer, so I'm not afraid of any coding necessary and I have an open budget (within reason, I want to continue my marriage after the projects credit card bill comes in)
If I can't quite get this rather ambitious project done in time for Halloween, I'll scale it back to basic motion sensing and move on to Christmas, but I am enjoying time spent coming up with crazy ideas with my daughter, so I'm going to try and would appreciate any and all ideas.