Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates an ESP32 microcontroller, an ili9341 TFT display, a 4x4 membrane matrix keypad, a DFPlayer MINI, and a loudspeaker. The circuit is designed to interface these components for a variety of functionalities, including user input via the keypad, visual output on the TFT display, and audio output through the loudspeaker.

Component List

1. ESP32

   • Description: A powerful microcontroller with built-in Wi-Fi and Bluetooth capabilities.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT

2. ili9341 TFT Display

   • Description: A 2.8-inch TFT display with a resolution of 240x320 pixels.
   • Pins: VCC, GND, CS, RESET, DC/RS, SDI, SCK, LED, SDO, T_CLK, T_CS, T_DIN, T_DO, T_IRQ

3. 4x4 Membrane Matrix Keypad

   • Description: A keypad with 16 buttons arranged in a 4x4 matrix.
   • Pins: R1, R2, R3, R4, C1, C2, C3, C4

4. DFPlayer MINI

   • Description: A small MP3 player module that can be controlled via serial communication.
   • Pins: VCC, BUSY, RX, USB -, TX, USB +, DAC_R, K2/ADC_KEY, DAC_L, K1/ADC_KEY, SPK1, IO 2, GND, SPK2, IO 1

5. Loudspeaker

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

Wiring Details

ESP32

• D32 connected to 4x4 Membrane Matrix Keypad C4
• D33 connected to 4x4 Membrane Matrix Keypad C3
• D25 connected to 4x4 Membrane Matrix Keypad C2
• D26 connected to 4x4 Membrane Matrix Keypad C1
• D27 connected to 4x4 Membrane Matrix Keypad R4
• D14 connected to 4x4 Membrane Matrix Keypad R3
• D12 connected to 4x4 Membrane Matrix Keypad R2
• D13 connected to 4x4 Membrane Matrix Keypad R1
• GND connected to ili9341 TFT Display GND and DFPlayer MINI GND
• VIN connected to ili9341 TFT Display VCC and DFPlayer MINI VCC
• D15 connected to ili9341 TFT Display CS
• D2 connected to ili9341 TFT Display RESET
• D4 connected to ili9341 TFT Display DC/RS
• D18 connected to ili9341 TFT Display SCK
• D19 connected to ili9341 TFT Display SDO
• RX0 connected to DFPlayer MINI TX
• TX0 connected to DFPlayer MINI RX
• D23 connected to ili9341 TFT Display SDI

ili9341 TFT Display

• GND connected to ESP32 GND and DFPlayer MINI GND
• VCC connected to ESP32 VIN and DFPlayer MINI VCC
• CS connected to ESP32 D15
• RESET connected to ESP32 D2
• DC/RS connected to ESP32 D4
• SCK connected to ESP32 D18
• SDO connected to ESP32 D19
• SDI connected to ESP32 D23
• LED connected to ESP32 VIN

4x4 Membrane Matrix Keypad

• C4 connected to ESP32 D32
• C3 connected to ESP32 D33
• C2 connected to ESP32 D25
• C1 connected to ESP32 D26
• R4 connected to ESP32 D27
• R3 connected to ESP32 D14
• R2 connected to ESP32 D12
• R1 connected to ESP32 D13

DFPlayer MINI

• GND connected to ESP32 GND and ili9341 TFT Display GND
• VCC connected to ESP32 VIN and ili9341 TFT Display VCC
• TX connected to ESP32 RX0
• RX connected to ESP32 TX0
• SPK1 connected to Loudspeaker pin2
• SPK2 connected to Loudspeaker pin1

Loudspeaker

• pin2 connected to DFPlayer MINI SPK1
• pin1 connected to DFPlayer MINI SPK2

Code

No code is provided for this circuit.

This document provides a comprehensive overview of the circuit, including a summary, component list, wiring details, and code documentation. Each section is designed to offer clear and concise information to facilitate understanding and replication of the circuit.