Circuit Documentation

Summary

This circuit is an adjustable power supply system built around an Arduino Nano microcontroller. It includes various components such as LEDs, a loudspeaker, a vibration motor, a pushbutton, a Bluetooth module (HC-05), a battery charging module (TP4056), and a Polymer Lithium Ion Battery. The system allows for setting and displaying desired voltage and current values on a TFT screen, and it also displays the actual voltage, current, and power drawn by the connected load.

Component List

1. LED: Four Pin (Common Cathode)

   • Pins: red anode, common cathode, green anode, blue anode
   • Description: RGB LED with a common cathode configuration.

2. Loudspeaker

   • Pins: pin1, pin2
   • Description: Standard loudspeaker for audio output.

3. Vibration Motor

   • Pins: POS, NEG
   • Description: Small vibration motor for haptic feedback.

4. Arduino Nano

   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK
   • Description: Microcontroller board based on the ATmega328P.

5. Resistor (220 Ohms)

   • Pins: pin1, pin2
   • Description: Resistor with a resistance of 220 Ohms.

6. Pushbutton

   • Pins: Pin 2, Pin 1, Pin 3, Pin 4
   • Description: Standard pushbutton for user input.

7. HC-05 Bluetooth Module

   • Pins: EN, VCC, GND, TXD, RXD, STATE
   • Description: Bluetooth module for wireless communication.

8. TP4056 Battery Charging Module

   • Pins: OUT-, B-, B+, OUT+, IN-, IN+
   • Description: Lithium-ion battery charging module.

9. Polymer Lithium Ion Battery - 850mAh

   • Pins: GND, VCC
   • Description: Rechargeable lithium-ion battery with a capacity of 850mAh.

10. Resistor (10k Ohms)

    • Pins: pin1, pin2
    • Description: Resistor with a resistance of 10k Ohms.

11. Arduino UNO

    • 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
    • Description: Microcontroller board based on the ATmega328P.

Wiring Details

LED: Four Pin (Common Cathode)

• red anode: Connected to Arduino Nano pin D9
• common cathode: Connected to Resistor (220 Ohms) pin2
• green anode: Connected to Arduino Nano pin D10
• blue anode: Connected to Arduino Nano pin D11/MOSI

Loudspeaker

• pin1: Connected to Arduino Nano GND
• pin2: Connected to Arduino Nano pin D3

Vibration Motor

• POS: Connected to Arduino Nano pin D4
• NEG: Connected to Arduino Nano GND

Arduino Nano

• D1/TX: Connected to HC-05 TXD
• D0/RX: Connected to HC-05 RXD
• GND: Connected to HC-05 GND, Loudspeaker pin1, Vibration Motor NEG, TP4056 OUT-, Pushbutton Pin 1
• D2: Connected to Pushbutton Pin 2, Resistor (10k Ohms) pin2
• D3: Connected to Loudspeaker pin2
• D4: Connected to Vibration Motor POS
• D9: Connected to LED red anode
• D10: Connected to LED green anode
• D11/MOSI: Connected to LED blue anode
• 5V: Connected to HC-05 VCC, Resistor (220 Ohms) pin1, Resistor (10k Ohms) pin1, TP4056 OUT+

Resistor (220 Ohms)

• pin1: Connected to Arduino Nano 5V
• pin2: Connected to LED common cathode

Pushbutton

• Pin 2: Connected to Resistor (10k Ohms) pin2, Arduino Nano pin D2
• Pin 1: Connected to Arduino Nano GND

HC-05 Bluetooth Module

• VCC: Connected to Arduino Nano 5V
• GND: Connected to Arduino Nano GND
• TXD: Connected to Arduino Nano D1/TX
• RXD: Connected to Arduino Nano D0/RX

TP4056 Battery Charging Module

• OUT+: Connected to Arduino Nano 5V, Resistor (220 Ohms) pin1, Resistor (10k Ohms) pin1
• OUT-: Connected to Arduino Nano GND, Loudspeaker pin1, Vibration Motor NEG
• B-: Connected to Polymer Lithium Ion Battery GND
• B+: Connected to Polymer Lithium Ion Battery VCC

Polymer Lithium Ion Battery - 850mAh

• GND: Connected to TP4056 B-
• VCC: Connected to TP4056 B+

Resistor (10k Ohms)

• pin1: Connected to Arduino Nano 5V
• pin2: Connected to Pushbutton Pin 2, Arduino Nano pin D2

Code Documentation

Arduino Nano Code

/*
 * Adjustable Power Supply with Arduino Nano
 * Components:
 * - Arduino Nano
 * - 2 Buttons (for adjusting voltage and current)
 * - 1.8-inch TFT LCD Screen
 * - XL4016 Module
 * - Current Sensor
 * - Voltage Sensor
 *
 * This code allows you to set and display the desired voltage and current
 * values on the TFT screen. It also displays the actual voltage, current,
 * and power drawn by the connected load.
 */

#include <Adafruit_GFX.h>
#include <Adafruit_TFTLCD.h>
#include <TouchScreen.h>

// Pin definitions
#define BUTTON1_PIN 2
#define BUTTON2_PIN 3
#define VOLTAGE_SENSOR_PIN A0
#define CURRENT_SENSOR_PIN A1
#define TFT_CS 10
#define TFT_CD 9
#define TFT_WR 8
#define TFT_RD 7
#define TFT_RESET 6

// TFT display
Adafruit_TFTLCD tft(TFT_CS, TFT_CD, TFT_WR, TFT_RD, TFT_RESET);

// Variables
float setVoltage = 0.0;
float setCurrent = 0.0;
float actualVoltage = 0.0;
float actualCurrent = 0.0;
float power = 0.0;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize pins
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);

  // Initialize TFT display
  tft.begin(0x9341);
  tft.setRotation(1);
  tft.fillScreen(BLACK);
  tft.setTextColor(WHITE);
  tft.setTextSize(2);

  // Display initial values
  updateDisplay();
}

void loop() {
  // Read button states
  if (digitalRead(BUTTON1_PIN) == LOW) {
    setVoltage += 0.1;
    delay(200);
  }
  if (digitalRead(BUTTON2_PIN) == LOW) {
    setCurrent += 0.1;
    delay(200);
  }

  // Read sensors
  actualVoltage = analogRead(VOLTAGE_SENSOR_PIN) * (5.0 / 1023.0) * 11.0;
  actualCurrent = analogRead(CURRENT_SENSOR_PIN) * (5.0 / 1023.0) * 5.0;
  power = actualVoltage * actualCurrent;

  // Update display
  updateDisplay();

  // Delay for stability
  delay(500);
}

void updateDisplay() {
  tft.fillScreen(BLACK);
  tft.setCursor(0, 0);
  tft.print("Set Voltage: ");
  tft.print(setVoltage);
  tft.print(" V");
  tft.setCursor(0, 30);
  tft.print("Set Current: ");
  tft.print(setCurrent);
  tft.print(" A");
  tft.setCursor(0, 60);
  tft.print("Actual Voltage: ");
  tft.print(actualVoltage);
  tft.print(" V");
  tft.setCursor(0,