3386P-1-103 10K Precision Potentiometer

### Lesson Plan: Understanding and Utilizing the 3386P-1-103 10K Precision Potentiometer in Electronic Circuits

**Introduction**

In this lesson, we will delve into the operational principles and practical applications of the 3386P-1-103 10K Precision Potentiometer. Potentiometers are versatile components used for adjusting voltage levels in a circuit. They are commonly employed in applications such as volume controls, sensor calibration, and adjustable power supplies. By the end of this lesson, you will have a comprehensive understanding of its characteristics and how to incorporate it into your electronic projects.

**Learning Objectives**

Upon completing this lesson, you will be able to:
1. Identify the physical characteristics of the 3386P-1-103 10K Precision Potentiometer.
2. Explain the function of a potentiometer and its role in electronic circuits.
3. Implement the 3386P-1-103 potentiometer in various circuit configurations to adjust voltage levels.

**Materials Needed**

– 3386P-1-103 10K Precision Potentiometer
– Breadboard
– Jumper wires
– Raspberry Pi Pico WH
– LED
– 330-ohm resistor
– Multimeter (optional)

**Background Information**

The 3386P-1-103 is a 10K ohm precision potentiometer, often referred to as a variable resistor or “pot.” It has three terminals: two fixed terminals connected to a resistive element and a third terminal connected to a wiper, which slides along the resistive element to provide a variable resistance. Potentiometers are used to adjust levels in a circuit, such as voltage dividers, and can fine-tune analog signals.

**Potentiometer Characteristics**

The 3386P-1-103 potentiometer has three terminals:
– **VCC (Input Voltage)**: Connected to one end of the resistive element.
– **GND (Ground)**: Connected to the other end of the resistive element.
– **Wiper (Variable Output)**: Provides a variable voltage depending on the position of the wiper along the resistive element.

**Principles of Operation**

Potentiometers operate by varying the position of the wiper along the resistive element, which changes the voltage at the wiper terminal:
– **Low Resistance**: When the wiper is close to the VCC terminal, the resistance between the wiper and VCC is low, resulting in a higher voltage at the wiper.
– **High Resistance**: When the wiper is close to the GND terminal, the resistance between the wiper and VCC is high, resulting in a lower voltage at the wiper.

**Circuit Diagram and Setup**

**Step-by-Step Instructions**

1. **Identify the Potentiometer Terminals**:
– Locate the VCC, GND, and wiper terminals on the potentiometer.

2. **Set Up the Breadboard Circuit**:
– Place the potentiometer and an LED on the breadboard.
– Connect the VCC terminal of the potentiometer to the 3.3V pin on the Raspberry Pi Pico WH.
– Connect the GND terminal of the potentiometer to the ground (GND) pin on the Raspberry Pi Pico WH.
– Connect the wiper terminal of the potentiometer to an ADC pin (e.g., GP26) on the Raspberry Pi Pico WH.
– Connect the anode of the LED to another GPIO pin (e.g., GP15) on the Pico through a 330-ohm resistor.
– Connect the cathode of the LED to the ground.

3. **Write the Control Code**:
– Open your MicroPython IDE and write the following code to read the potentiometer value and control the LED brightness:

“`python
from machine import Pin, ADC
from time import sleep

pot = ADC(26)
led = Pin(15, Pin.OUT)

while True:
pot_value = pot.read_u16()
if pot_value > 32767:
led.on()
else:
led.off()
sleep(0.1)
“`

4. **Upload and Test the Code**:
– Connect your Raspberry Pi Pico WH to your computer using a Micro USB cable.
– Upload the code to the Raspberry Pi Pico WH.
– Rotate the knob of the 3386P-1-103 potentiometer and observe the LED turning on and off based on the potentiometer’s position.

5. **Optional: Measure Voltage Changes**:
– Use a multimeter to measure the voltage at the wiper terminal while adjusting the potentiometer. Observe the voltage change corresponding to the wiper position.

**Applications and Extensions**

1. **Analog Signal Control**:
– Use the 3386P-1-103 potentiometer to fine-tune sensor readings or control analog signals in your projects.
– Integrate the potentiometer into audio systems to control volume or balance.

2. **Voltage Divider Configuration**:
– Implement the potentiometer as a variable resistor in voltage divider circuits to adjust output voltage levels dynamically.
– Experiment with different resistance values to understand the effect on the circuit.

**Summary and Review**

This lesson has provided a detailed exploration of the 3386P-1-103 10K Precision Potentiometer, covering its identification, operational principles, and practical applications in electronic circuits. By understanding and utilizing potentiometers, you can effectively adjust voltage levels and fine-tune analog signals, enhancing the versatility and functionality of your electronic projects.

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