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10K timmer potentiometer

10K Trimmer Potentiometer (Through Hole)

20k trimmer potentiometer

20K Through Hole Trimmer Potentiometer

50K Potentiometer Panel Mount

50K Potentiometer Panel Mount (Non Trimmer)

Small red knob for potentiometer

Small Knob for Potentiometer - Black with Red Cap

Potentiometer with adjustable knob.

50K Potentiometer Panel Mount (Non Trimmer) With Knob

A 5K Rotary Potentiometer shown with a pencil for scale.

5K Potentiometer - Rotary

Top view of 50k Trimmer variable resistor potentiometer

50K Trimmer Through Hole

White prototyping breadboard with 30 tie strips and two power rails on each side.

White Prototyping Breadboard (2x30 columns of tie strips and 2x2 rows of power strips)

Clear Semi Transparent Breadboard

Clear Prototyping Breadboard (2x30 columns of tie strips and 2x2 rows of power strips)

Thumbnail: A bundle of 65 jumper wires of various length and color. Bound together with the male connectors shown in the foreground.

Bundle of 65 Male to Male Flexible Jumper Wires


Breadboarding: Potentiometer (Voltage Divider) to ADC (Analog to Digital Conversion)

The center lead (Vout) of the potentiometer is connected to the ADC pin 0. The potentiometer's outer leads are connected to ground (GND) and 5V (VCC). These connections create the voltage divider. Optionally you can used resistors rather than wires for the two outer lead connections to minimize the possibility of a short where the resistance goes very low across the center lead to one of the outer leads.

The ADC needs to be powered. The ADC has its own power pins for AVCC and GND. the AVCC is connected directly to VCC (the 5V rail) and the GND is simply connected to GND on the - rail. Across these two power pins should reside a 100nf (nanofarad) or .1uf (microfarad) capacitor just like on the main power pins.

Another important pin for ADC is the voltage reference pin. This pin will receive the top voltage in our range of voltages we need to consider in the ADC input. Say, for instance, you don't want the 5v to be your voltage reference, because your device only has a range of 0v to 3.3v that will be delivered to the ADC. The top voltage in this range, 3.3v, should be connected to the ADC voltage reference Vref pin. If you had 5v connected to this Vref pin, but the device only gave you 0v to 3.3v, then your precision will be reduced.

The Vref pin can be set in programming, which is the case in this video clip.

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