I'm using an Arduino to read analog values from my sensor running at 5V using a voltage divider. The sensor contains a force resistive sheet where the resistance of the sheet decreases as force is applied on it, and the sensor is used to determine whether someone has stepped onto it (it doesn't need to measure the amount of force applied). I'm using a voltage divider to read the voltage change and at the Arduino side I will determine that the sensor is being stepped on when the value exceeds a certain threshold value.
Apart from the sensor, 2 additional parallel wires will be running along the same path as the sensor, and the two wires (12V and GND) are connected to a 12V led strip at 100mA.
The length of the 4 parallel running wires are 10m each, and I've received 2 different sets of advice -
(1)The wires are long so they are acting like antennas and will be affected by EMI, so I should use ADC/comparator placed as close as possible to the sensor to transmit the data digitally.
(2)The wires are running at relatively low voltage and low current, and the application is running at low speed (my Arduino is reading the analog values at 10 times/sec) so it will not be affected by EMI. Hence, reading analog value using the voltage divider will not be a problem.
Can someone advice?