Tuning Adjustable Analog and Digital Sensors
Many of the sensors we supply have amplifier circuitry (op-amp) built right into the sensor. This circuitry can be adjusted with the potentiometer. Adjusting this will either change the trigger level (digital output) or it will change the amplification of an analog signal. You can adjust the potentiometers using a small screwdriver.
Adjustable Digital Sensors
When using an adjustable digital sensor like the shock sensor, you can tune the level at which the sensor will output the digital signal (e.g. how hard the shock sensor must be hit).
Adjustable Analog Sensors
When using an adjustable analog sensor, like the light sensor, it will output a voltage based on the amount of light it sees. In your situation, the maximum amount of light might only output 2.0V, which only uses 40% of an Arduino’s full ADC range. To get the most out of your hardware, you can adjust the amplification with the potentiometer so that the maximum light goes all the way up to 5.0V, allowing for use of the full ADC range.