Circuit Documentation

Summary of the Circuit

This circuit integrates a variety of components including an Arduino UNO, an ESP8266 NodeMCU, an LCD I2C display, a temperature sensor, a servo motor (MG996R), a resistor, a 12V power supply, a terminal block, and a SparkFun 9DoF Sensor Stick. The Arduino UNO serves as the primary microcontroller, interfacing with the temperature sensor, LCD display, and servo motor. It also communicates with the ESP8266 NodeMCU for potential IoT capabilities. The circuit is powered by a 12V power supply, which is regulated down to 5V and 3.3V for different components. The temperature sensor is connected with a pull-up resistor to the Arduino. The LCD display uses I2C communication, and the servo motor is controlled via one of the Arduino's PWM outputs.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Provides digital and analog I/O pins
• Features USB connection for programming and serial communication

ESP8266 NodeMCU

• Wi-Fi enabled microcontroller module based on the ESP8266
• Offers GPIO, I2C, and serial communication

LCD I2C Display

• Alphanumeric liquid crystal display with an I2C interface
• Used for displaying data and messages

Temperature Sensor

• Measures ambient temperature
• Typically outputs a digital signal corresponding to the temperature

MG996R (Servo Motor)

• High-torque digital servo motor
• Controlled by PWM signal

Resistor

• Passive two-terminal electrical component
• Resistance: 200 Ohms

12V Power Supply

• Provides a 12V DC output
• Powers the Arduino UNO and other components

Terminal Block

• Electrical connector with several terminals
• Used for securing and/or terminating wires

SparkFun 9DoF Sensor Stick

• Inertial measurement unit (IMU) with sensors for acceleration, rotation, and magnetic fields
• Communicates via I2C

Wiring Details

Arduino UNO

• 5V connected to the VCC of MG996R, Temperature Sensor, and LCD I2C Display
• GND connected to the GND of MG996R, Temperature Sensor, and LCD I2C Display
• D2 connected to the data pin of the Temperature Sensor through a 200 Ohm resistor
• 3.3V connected to the VIN of ESP8266 NodeMCU
• GND connected to the GND of ESP8266 NodeMCU
• Vin connected to the + of the 12V power supply
• A4 (SDA) connected to the SDA of the LCD I2C Display
• A5 (SCL) connected to the SCL of the LCD I2C Display
• GND connected to the - of the 12V power supply
• D9 connected to the SIG of MG996R
• D1 (TX) connected to the RX of ESP8266 NodeMCU
• D0 (RX) connected to the TX of ESP8266 NodeMCU

ESP8266 NodeMCU

• VIN connected to the 3.3V of Arduino UNO
• GND connected to the GND of Arduino UNO
• RX connected to the TX (D1) of Arduino UNO
• TX connected to the RX (D0) of Arduino UNO

LCD I2C Display

• VCC connected to the 5V of Arduino UNO
• GND connected to the GND of Arduino UNO
• SDA connected to the A4 (SDA) of Arduino UNO
• SCL connected to the A5 (SCL) of Arduino UNO

Temperature Sensor

• Temp VDD Red connected to the 5V of Arduino UNO
• Temp GND Black connected to the GND of Arduino UNO
• Temp DQ Data Yellow connected to the D2 of Arduino UNO through a 200 Ohm resistor

MG996R (Servo Motor)

• VCC connected to the 5V of Arduino UNO
• GND connected to the GND of Arduino UNO
• SIG connected to the D9 of Arduino UNO

Resistor

• pin1 connected to the D2 of Arduino UNO
• pin2 connected to the data pin of the Temperature Sensor

12V Power Supply

• + connected to the Vin of Arduino UNO
• - connected to the GND of Arduino UNO

Documented Code

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:

}

Note: The provided code for the Arduino UNO is a template with empty setup and loop functions. This code should be expanded with the specific logic required for the circuit's operation, such as reading the temperature sensor, controlling the LCD display, and sending commands to the servo motor.

ESP8266 NodeMCU Code

No code was provided for the ESP8266 NodeMCU. It is assumed that the ESP8266 NodeMCU will be programmed separately to handle Wi-Fi communication and other tasks as required by the circuit's design.