Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino Mega 2560 microcontroller as the central processing unit, interfaced with various peripherals including an LCD Display 16x2, NRF24L01 wireless module, L298N DC motor driver, a 5v mini water pump, HC-05 Bluetooth module, a potentiometer, and resistors. The circuit is designed to control a water pump and communicate wirelessly, with user inputs and system feedback provided via the LCD display and Bluetooth connection.

Component List

Arduino Mega 2560

• Microcontroller board based on the ATmega2560
• Provides numerous digital input/output pins, including PWM outputs, and analog inputs
• Features I2C, SPI, and UART communication capabilities

LCD Display 16x2

• Alphanumeric liquid crystal display capable of displaying 16 characters per line across 2 lines
• Utilizes a parallel interface for communication

NRF24L01

• A 2.4GHz wireless transceiver module
• Provides SPI communication interface

L298N DC Motor Driver

• Dual H-bridge motor driver capable of driving a pair of DC motors or a stepper motor
• Includes enable and input control pins for speed and direction control

5v Mini Water Pump

• A small DC water pump operating at 5 volts
• Used for pumping water in the system

HC-05 Bluetooth Module

• A widely used Bluetooth module for wireless communication
• Supports serial communication via UART

Potentiometer

• A three-terminal resistor with an adjustable voltage divider
• Used for adjusting LCD contrast or as an analog input

Resistors (1k Ohms)

• Passive components used to limit current or divide voltages
• Three resistors with a resistance of 1k Ohms each

Wiring Details

Arduino Mega 2560

• D11 PWM connected to a 1k Ohm resistor
• GND connected to common ground net
• 5V connected to common 5V net
• 3V3 connected to NRF24L01 VCC (3V)
• D4 PWM to DB4 of LCD Display
• D5 PWM to DB5 of LCD Display
• D6 PWM to DB6 of LCD Display
• D7 PWM to IN1 of L298N Motor Driver
• D8 PWM to IN2 of L298N Motor Driver
• D9 PWM to CE of NRF24L01
• D10 PWM to TXD of HC-05
• D52 to SCK of NRF24L01
• D50 to MISO of NRF24L01
• D44 to DB7 of LCD Display
• D42 to E of LCD Display
• D40 to RS of LCD Display
• D53 to CSN of NRF24L01
• D51 to MOSI of NRF24L01

LCD Display 16x2

• RW, VSS, and LEDK connected to ground
• VDD and LEDA connected to 5V
• DB4, DB5, DB6, and DB7 connected to corresponding Arduino Mega 2560 pins
• E and RS connected to corresponding Arduino Mega 2560 pins
• VO connected to the wiper (output) of the potentiometer

NRF24L01

• VCC (3V) connected to 3.3V from Arduino Mega 2560
• GND connected to common ground net
• CE, SCK, MISO, CSN, and MOSI connected to corresponding Arduino Mega 2560 pins

L298N DC Motor Driver

• GND connected to common ground net
• 5V connected to common 5V net
• IN1 and IN2 connected to corresponding Arduino Mega 2560 pins
• OUT1 connected to the negative pin of the 5v mini water pump
• OUT2 connected to the positive pin of the 5v mini water pump

5v Mini Water Pump

• Negative pin connected to OUT1 of L298N Motor Driver
• Positive pin connected to OUT2 of L298N Motor Driver

HC-05 Bluetooth Module

• RXD connected to a 1k Ohm resistor in series with another 1k Ohm resistor to ground
• GND connected to common ground net
• VCC connected to common 5V net
• TXD connected to D10 PWM of Arduino Mega 2560

Potentiometer

• GND connected to common ground net
• VCC connected to common 5V net
• Output connected to VO of LCD Display

Resistors (1k Ohms)

• One resistor connected between D11 PWM of Arduino Mega 2560 and ground
• Two resistors forming a voltage divider between RXD of HC-05 and ground

Documented Code

Arduino Mega 2560 - 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 any functional code. It needs to be populated with the logic to control the peripherals as per the circuit's requirements.