My father is a farmer, and he has a ball wrapper such as this one: http://www.hardwickagricultural.co.uk/controlpanel/shoppics/IMG_1266.JPG. For now, we can work quickly with it only if we are at least two people: one on a tractor to put balls on the machine, and arrange wrapped balls, and another people who needs to action the machine using hand controller. This machine is hydraulic, but we need to action hydraulic command by hand. So, I talked with him, and we agreed that it could be great to be able to work alone with this machine, and I proposed him to have a look at it.
Why am I telling you that? Because I started thinking about doing this using a Raspberry PI. I know that we can control some GPIO pin to emit electricity or not, so, this would be perfect to control some hydraulic valves. I am a computer scientist, so, I am not afraid to writing needed programs to control it. However, what I am missing is some electronic requirements. On the Internet, I found plenty of captor, so, I will look for the ones I need to do what I want. However, what I am missing is the remote controller. On the beginning, I looked to use bluetooth from a mobile phone, but I know that bluetooth pairing can take some times and bluetooth range is about 10m, so, lots of bluetooth pairing may be needed as we arrange balls far from the machine, and I do not want to have to wait 30 seconds each time I need to control the machine. So, what I need is a wireless command with a pairing almost immediate within a range of about 10 meters (also, I need that we can work with it through glasses, and with an pairing as fast as what I explained). Do you have any suggestion regarding this? Maybe some technologies I could use? If you could point me to some hardware that could work with the PI to do this, it would be great.
Thanks for your replies.