I have a raspberry pi and I want to connect a vibration sensor. The connection to the sensor should be wireless. I want to have approximately a range from 30m up to 100m.
What would be a low price configuration to do that? What do I need? I have the raspberry already and a low price vibration sensor. So I need a module for the sensor with embedded ad-converter. And the module need a wireless connection. On the other side the raspberry also need a wireless connection module to connect both modules together.
I thougt about xbee or bluetooth. Xbee is very expensive I think. But the range is super and the size is also very small. And the xbee board has already a build in ad converter.
Which low price and "small" size setup could you recommend? Which trade offs are there with such a solution?