![]() ![]() The code for this circuit could not be simpler. These can be singular wires if you have them long enough. A few extra wires have been added just to allow for ease of wiring both the 5v and GND lines. Here is an image of the same circuit however this time physically put together on the breadboard. An easy way of looking at it is that the two resistors (one the sensor) are connected in series whilst the data output is connected between them: The comparison resistor is simply connected to the signal line of the sensor and then to GND. As you can see the sensor is connected to the Arduino via the pin A0. The following is an example of a voltage divider circuit used for a pressure sensor. So if the the sensor and the resistor have the same resistance, the 5V is split evenly (2.5V) to each part. Arduinos run at 5v, so at 5V (its max) the analog pin would read 1023, and at 0v it would read 0. The amount of the 5V that both the resistor and sensor gets is proportional to their resistance. The analog read on your micro-controller is basically a voltage meter. ![]() In order to do that however we first need a fixed resistor (not changing) that we can use for providing a comparison. This is called a voltage divider circuit as the supplied voltage is divided between the sensor and the resistor. We can then measure that change using an a micro-controller such as an Arduino via one of its analog inputs. Using the flex sensor as an example as we bend the sensor its resistance increases. This tutorial details how to make a simple voltage divider circuit that can be used to measure input from physical variable resistance sensors such as flex sensors and pressure sensors.Ī variable resistor is one which changes its resistance when interacted with.
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