I have 3-6 microcontrollers, up to 2m apart. One of them is designated the server and will be fed sensor data from the others, at least at 100 Hz. (Each data point is just a couple of bytes)
Since the microcontrollers move around, I can't connect them with wires. What's a good wireless solution here?
My initial idea was Bluetooth, mainly because that's the one solution I'm familiar with, but Bluetooth consumes much power (my circuits will be battery-powered) and Bluetooth modules are expensive.