Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with an LCD display, a temperature sensor (LM35), a rotary potentiometer, a resistor, and an LED. The Arduino UNO reads temperature data from the LM35 sensor, adjusts the display contrast using the potentiometer, and controls the LED. The LCD display is used to show the temperature readings.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

LCD Display (16 pin)

• Description: A 16-pin LCD display used for showing data.
• Pins: VSS, VDD, VO, RS, R_W, E, DB0, DB1, DB2, DB3, DB4, DB5, DB6, DB7, A, K

Temperature Sensor (LM35)

• Description: A precision centigrade temperature sensor.
• Pins: +Vs, Vout, GND

Rotary Potentiometer

• Description: A variable resistor used to adjust the LCD contrast.
• Pins: leg1, wiper, leg2
• Properties:
  • Resistance: 10,000 Ohms

Resistor

• Description: A 100 Ohm resistor used in series with the LED.
• Pins: pin1, pin2
• Properties:
  • Resistance: 100 Ohms

LED: Two Pin (green)

• Description: A green LED.
• Pins: cathode, anode

Wiring Details

Arduino UNO

• 5V: Connected to +Vs of the Temperature Sensor, leg1 of the Rotary Potentiometer, A and VDD of the LCD Display.
• GND: Connected to GND of the Temperature Sensor, cathode of the LED, leg2 of the Rotary Potentiometer, K, R_W, and VSS of the LCD Display.
• A0: Connected to Vout of the Temperature Sensor.
• D13: Connected to pin2 of the Resistor.
• D12: Connected to RS of the LCD Display.
• D11: Connected to E of the LCD Display.
• D5: Connected to DB4 of the LCD Display.
• D4: Connected to DB5 of the LCD Display.
• D3: Connected to DB6 of the LCD Display.
• D2: Connected to DB7 of the LCD Display.

LCD Display (16 pin)

• VSS: Connected to GND of the Arduino UNO.
• VDD: Connected to 5V of the Arduino UNO.
• VO: Connected to wiper of the Rotary Potentiometer.
• RS: Connected to D12 of the Arduino UNO.
• R_W: Connected to GND of the Arduino UNO.
• E: Connected to D11 of the Arduino UNO.
• DB4: Connected to D5 of the Arduino UNO.
• DB5: Connected to D4 of the Arduino UNO.
• DB6: Connected to D3 of the Arduino UNO.
• DB7: Connected to D2 of the Arduino UNO.
• A: Connected to 5V of the Arduino UNO.
• K: Connected to GND of the Arduino UNO.

Temperature Sensor (LM35)

• +Vs: Connected to 5V of the Arduino UNO.
• Vout: Connected to A0 of the Arduino UNO.
• GND: Connected to GND of the Arduino UNO.

Rotary Potentiometer

• leg1: Connected to 5V of the Arduino UNO.
• wiper: Connected to VO of the LCD Display.
• leg2: Connected to GND of the Arduino UNO.

Resistor

• pin1: Connected to anode of the LED.
• pin2: Connected to D13 of the Arduino UNO.

LED: Two Pin (green)

• cathode: Connected to GND of the Arduino UNO.
• anode: Connected to pin1 of the Resistor.

Code Documentation

Arduino UNO Code

sketch.ino

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

documentation.txt