Help understanding sensor placement on multiplexing schematic

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working off of schematic: http://fluidforms.eu/docs/multiplexedarduinowiringdiagram.pdf

you call me extremely novice engineer. know wiring typically (always?) have ground or negative end circuit, confuses me when looking @ schematic each cluster of sensors.

it looks each sensor has 1 wire/connection pin on multiplexing chip, giving each chip 16 sensors. if imagine this, see wire going chip 1 end on each sensor (ldr or light sensor or whatever want call, in case)... other end of sensor go nothing?

i threw illustration of confusion:

each analog multiplexer connects 1 of 16 pins arduino analog input.  in diagram each of 16 pins has pull-up resistor.  necessary if "sensor" variable resistor: ldr light, thermistor temperature, pdr pressure...  in cases other end of sensor goes ground , sensor/resistor combination acts voltage divider.

if 'sensor' potentiometer should leave out pull-up resistor.  connect ends of pot. +5 , ground.  connect wiper of pot. input pin.

if sensor other form of voltage source (0 5 volts) should leave out pull-up resistor.


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