Thu Jun 09, 2016 2:04 pm
That completely depends on the sensor interface. I *think* these are the limits to a few ways to interface, but you should check.
1 wire can do 100 devices per bus per the spec, in reality on the Pi it seems to be around 10.
I2C can do 128 7bit addressed devices per bus. (Each device address is configured at the sensor, so finding that many may with different address be the issue)
SPI can do 2 devices
USB I'm not sure
Probably some other ways to address sensors that I've missed
There are many add-on boards usually called "hats" that can extend the above and also make them more reliable.