SMUR Radio Tech Notes

Arduino Encoded Song Library
https://github.com/robsoncouto/arduino-songs

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Example Code using HC-12 Transceiver Module

ESP-NOW Project

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Modify code to receive input and display text using ILI9341 240x320 TFT LCD Touch Screens

Adding a touch screen elevates this from a simple script to a fully functional standalone device. To achieve this, we will use the popular Adafruit ILI9341 library for the display and the XPT2046_Touchscreen library for the touch input.

You will need to install these three libraries in your Arduino IDE via the Library Manager:

1. Adafruit GFX Library

2. Adafruit ILI9341

3. XPT2046_Touchscreen (by Paul Stoffregen)

Standard ESP32 SPI Wiring

Both the Sender and Receiver will use the SPI bus for the display. Wire both ESP32s to their respective screens as follows:

ILI9341 Pin	ESP32 Pin	Note
VCC	3.3V	Power
GND	GND	Ground
CS	GPIO 15	TFT Chip Select
RESET	GPIO 4	TFT Reset
DC	GPIO 2	Data/Command
SDI (MOSI)	GPIO 23	SPI MOSI
SCK	GPIO 18	SPI Clock
LED	3.3V	Backlight
MISO	GPIO 19	SPI MISO
T_CS	GPIO 33	Touch Chip Select (Sender Only)

(Note: T_IRQ, T_DO, T_DIN, and T_CLK share the SPI pins with the display, except for the Touch Chip Select T_CS)

1. Sender Code (The Touch Controller)

This code draws a large "PLAY" button on the screen. When you tap the button, it maps the raw touch coordinates to the screen dimensions and sends the Bluetooth command.

#include "BluetoothSerial.h"

#include <SPI.h>

#include <Adafruit_GFX.h>

#include <Adafruit_ILI9341.h>

#include <XPT2046_Touchscreen.h>

// Display and Touch Pins

#define TFT_CS 15

#define TFT_DC 2

#define TFT_RST 4

#define TS_CS 33

// Initialize Display and Touch

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

XPT2046_Touchscreen ts(TS_CS);

// Initialize Bluetooth

BluetoothSerial SerialBT;

String targetName = "ESP32_Speaker";

bool connected = false;

// Button dimensions

int btnX = 40, btnY = 100, btnW = 160, btnH = 80;

bool buttonPressed = false;

void setup() {

Serial.begin(115200);

// Start TFT

tft.begin();

tft.setRotation(1); // Landscape mode

tft.fillScreen(ILI9341_BLACK);

// Start Touch

ts.begin();

ts.setRotation(1);

// UI Setup

tft.setTextColor(ILI9341_WHITE);

tft.setTextSize(2);

tft.setCursor(10, 10);

tft.print("Connecting to Speaker...");

// Start Bluetooth

SerialBT.begin("ESP32_Controller", true);

connected = SerialBT.connect(targetName);

tft.fillRect(0, 0, 320, 40, ILI9341_BLACK); // Clear top bar

tft.setCursor(10, 10);

if(connected) {

tft.setTextColor(ILI9341_GREEN);

tft.print("Connected!");

drawPlayButton(ILI9341_BLUE);

} else {

tft.setTextColor(ILI9341_RED);

tft.print("Connection Failed.");

}

}

void loop() {

if (ts.touched() && connected) {

TS_Point p = ts.getPoint();

// Map raw touch coordinates to screen coordinates (values may need tweaking based on your specific screen)

int touchX = map(p.x, 300, 3800, 0, 320);

int touchY = map(p.y, 300, 3800, 0, 240);

// Check if touch is within button bounds

if (touchX > btnX && touchX < (btnX + btnW) && touchY > btnY && touchY < (btnY + btnH)) {

if (!buttonPressed) {

buttonPressed = true;

drawPlayButton(ILI9341_DARKCYAN); // Visual feedback

SerialBT.println("PLAY");

Serial.println("Command Sent");

delay(300); // Debounce

drawPlayButton(ILI9341_BLUE); // Revert button color

}

}

} else {

buttonPressed = false;

}

}

void drawPlayButton(uint16_t color) {

tft.fillRoundRect(btnX, btnY, btnW, btnH, 10, color);

tft.drawRoundRect(btnX, btnY, btnW, btnH, 10, ILI9341_WHITE);

tft.setTextColor(ILI9341_WHITE);

tft.setTextSize(4);

tft.setCursor(btnX + 35, btnY + 25);

tft.print("PLAY");

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2. Receiver Code (The Display Speaker)

This code waits for the Bluetooth command and updates the screen to show what the device is currently doing.

#include "BluetoothSerial.h"

#include <SPI.h>

#include <Adafruit_GFX.h>

#include <Adafruit_ILI9341.h>

// Display Pins

#define TFT_CS 15

#define TFT_DC 2

#define TFT_RST 4

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

BluetoothSerial SerialBT;

const int BUZZER_PIN = 25;

// Song Data

int melody[] = {262, 262, 392, 392, 440, 440, 392, 349, 349, 330, 330, 294, 294, 262};

int noteDurations[] = {500, 500, 500, 500, 500, 500, 1000, 500, 500, 500, 500, 500, 500, 1000};

int numNotes = sizeof(melody) / sizeof(melody[0]);

void setup() {

Serial.begin(115200);

pinMode(BUZZER_PIN, OUTPUT);

// Start TFT

tft.begin();

tft.setRotation(1); // Landscape

tft.fillScreen(ILI9341_BLACK);

// Start Bluetooth

SerialBT.begin("ESP32_Speaker");

updateScreen("Waiting for command...", ILI9341_YELLOW);

}

void loop() {

if (SerialBT.available()) {

String message = SerialBT.readStringUntil('\n');

message.trim();

if (message == "PLAY") {

updateScreen("Playing Song...", ILI9341_GREEN);

playSong();

updateScreen("Waiting for command...", ILI9341_YELLOW);

}

}

}

void playSong() {

for (int i = 0; i < numNotes; i++) {

tone(BUZZER_PIN, melody[i], noteDurations[i] * 0.9);

delay(noteDurations[i]);

}

}

void updateScreen(String text, uint16_t color) {

tft.fillScreen(ILI9341_BLACK);

tft.setTextColor(color);

tft.setTextSize(3);

// Center text roughly

int cursorX = 10;

int cursorY = 100;

tft.setCursor(cursorX, cursorY);

tft.print(text);

}