Arduino UNO Controlled Servo System with I2C LCD Interface

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Circuit Documentation

Summary

This circuit is designed to interface an Arduino UNO with multiple peripherals including a 16x2 I2C LCD and four Servo motors. The circuit is powered by a 220V AC power source, which is stepped down and rectified to DC using a Transformer and a Bridge Rectifier, respectively. The rectified voltage is then regulated to a lower DC voltage using an LM2956 Buck Converter. The Arduino UNO controls the Servo motors and communicates with the LCD over the I2C bus.

Component List

Arduino UNO

Microcontroller board based on the ATmega328P
It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

Transformer

A device that transfers electrical energy between two or more circuits through electromagnetic induction.

Power 220V

The main AC power source for the circuit.

Bridge Rectifier

A circuit that converts an AC input into a DC output.

LM2956 Buck Converter DC-DC

A DC-DC converter that steps down voltage from a higher voltage to a lower voltage.

16x2 I2C LCD

A liquid crystal display capable of displaying 16 characters per line, with 2 lines.
Uses I2C communication protocol.

Servo (Wokwi Compatible)

An actuator that has the capability to be positioned to a specific angular position by sending it a PWM (Pulse Width Modulation) signal.

Wiring Details

Arduino UNO

5V: Connected to the V+ of all Servo motors, VCC of the 16x2 I2C LCD, and OUT+ of the LM2956 Buck Converter.
GND: Connected to the GND of all Servo motors, GND of the 16x2 I2C LCD, and OUT- of the LM2956 Buck Converter.
A4 (SCL): Connected to the SCL pin of the 16x2 I2C LCD.
A5 (SDA): Connected to the SDA pin of the 16x2 I2C LCD.
D3, D5, D9, D10: Connected to the PWM pins of the Servo motors.

Transformer

5, 1: Connected to the input pins of the Bridge Rectifier (Source_in-, source_in+).
2, 3: Connected to the 220V power source (neutral wire, hot wire).

Bridge Rectifier

Source_in-, source_in+: Connected to the Transformer.
Source_out-, source_out+: Connected to the input pins of the LM2956 Buck Converter (IN-, IN+).

LM2956 Buck Converter DC-DC

IN+, IN-: Connected to the output pins of the Bridge Rectifier (source_out+, source_out-).
OUT+, OUT-: Connected to the 5V and GND pins of the Arduino UNO, respectively.

16x2 I2C LCD

GND: Connected to the GND of the Arduino UNO.
VCC: Connected to the 5V of the Arduino UNO.
SDA: Connected to the A5 pin of the Arduino UNO.
SCL: Connected to the A4 pin of the Arduino UNO.

Servo (Wokwi Compatible)

GND: Connected to the GND of the Arduino UNO.
V+: Connected to the 5V of the Arduino UNO.
PWM: Connected to the digital pins D3, D5, D9, D10 of the 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 is a template and does not include specific functionality. It needs to be completed with the setup and loop code to control the Servo motors and communicate with the LCD.