BATC Forum

Having seen the article ‘Alternatives to Streamdeck’ in CQ-TV271, I’ve realised there maybe interest in a lockdown project of mine. It uses an Arduino UNO and a MCUfriend 3.5” TFT LCD screen to give a 15 LCD key keypad to interface with OBS. All the parts I had to hand, but it shouldn’t cost more than £20 for the TFT and the Arduino UNO (16U2).


I’m no programmer, so my code may not be perfect, but it works for me.

--------------Copy and Paste Code into IDE-------------------------------------------------------

/*
*
*
* OBS-15-Keypad-V1-0.ino
*
* 15 keypad application base, by Phil Hayes M0PIT 2021.
*
* License: GNU General Public License Version 3.0.
*
* Copyright (C) 2020-2021. All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see: http://www.gnu.org/licenses/
*
*
*/


#if 1

#include <Adafruit_GFX.h>
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft;
#include <TouchScreen.h>
#include <Keyboard.h>

#define MINPRESSURE 200
#define MAXPRESSURE 1000

// ALL Touch panels and wiring is DIFFERENT
// copy-paste results from TouchScreen_Calibr_native.ino

//******* Two lines modified for calibration
const int XP = 7, XM = A1, YP = A2, YM = 6; //ID=0x9341
const int TS_LEFT = 131, TS_RT = 914, TS_TOP = 95, TS_BOT = 936;
//******** End of calibation

TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

Adafruit_GFX_Button SW1_btn, SW2_btn, SW3_btn, SW4_btn, SW5_btn, SW6_btn, SW7_btn, SW8_btn, SW9_btn, SW10_btn, SW11_btn, SW12_btn, SW13_btn, SW14_btn, SW15_btn;

int pixel_x, pixel_y; //Touch_getXY() updates global vars
bool Touch_getXY(void)
{
TSPoint p = ts.getPoint();
pinMode(YP, OUTPUT); //restore shared pins
pinMode(XM, OUTPUT);
digitalWrite(YP, HIGH); //because TFT control pins
digitalWrite(XM, HIGH);
bool pressed = (p.z > MINPRESSURE && p.z < MAXPRESSURE);
if (pressed) {
pixel_x = map(p.x, TS_LEFT, TS_RT, 0, tft.width()); //.kbv makes sense to me
pixel_y = map(p.y, TS_TOP, TS_BOT, 0, tft.height());
}
return pressed;
}

#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF


//------------------------------Define Key Output-------------------------------------------

#define KEY_N1 89 //** 89 = Numberpad 1
#define KEY_N2 90 //** 90 = Numberpad 2
#define KEY_N3 91 //** 91 = Numberpad 3
#define KEY_N4 92 //** 92 = Numberpad 4
#define KEY_N5 93 //** 93 = Numberpad 5
#define KEY_N6 94 //** 94 = Numberpad 6
#define KEY_N7 95 //** 95 = Numberpad 7
#define KEY_N8 96 //** 96 = Numberpad 8
#define KEY_N9 97 //** 97 = Numberpad 1

#define KEY_F1 58 //** 58 = F1
#define KEY_F2 59 //** 59 = F2
#define KEY_F3 60 //** 60 = F3
#define KEY_F4 61 //** 61 = F4
#define KEY_F5 62 //** 62 = F5
#define KEY_F6 63 //** 63 = F6

//------------------------------End Keys Output-------------------------------------------

uint8_t buf[8] = {
0 }; //Keyboard Report Buffer


void setup(void)
{

Serial.begin(9600);
uint16_t ID = tft.readID();
if (ID == 0xD3D3) ID = 0x9486; // write-only shield
tft.begin(ID);
tft.setRotation(0); //PORTRAIT
tft.fillScreen(BLACK);


//------------------------------Draw Keys-----------------------------------------

SW1_btn.initButton(&tft, 55, 50, 90, 85, WHITE, MAGENTA, BLACK, "SCR1", 3);
SW2_btn.initButton(&tft, 160, 50, 90, 85, WHITE, MAGENTA, BLACK, "SCR2", 3);
SW3_btn.initButton(&tft, 265, 50, 90, 85, WHITE, MAGENTA, BLACK, "SCR3", 3);

SW4_btn.initButton(&tft, 55, 145, 90, 85, WHITE, BLUE, BLACK, "SCR4", 3);
SW5_btn.initButton(&tft, 160, 145, 90, 85, WHITE, BLUE, BLACK, "SCR5", 3);
SW6_btn.initButton(&tft, 265, 145, 90, 85, WHITE, BLUE, BLACK, "SCR6", 3);

SW7_btn.initButton(&tft, 55, 240, 90, 85, WHITE, GREEN, BLACK, "SCR7", 3);
SW8_btn.initButton(&tft, 160, 240, 90, 85, WHITE, GREEN, BLACK, "SCR8", 3);
SW9_btn.initButton(&tft, 265, 240, 90, 85, WHITE, GREEN, BLACK, "SCR9", 3);

SW10_btn.initButton(&tft, 55, 335, 90, 85, WHITE, CYAN, BLACK, "WIPE", 3);
SW11_btn.initButton(&tft, 160, 335, 90, 85, WHITE, CYAN, BLACK, "CUT", 3);
SW12_btn.initButton(&tft, 265, 335, 90, 85, WHITE, CYAN, BLACK, "LUM", 3);

SW13_btn.initButton(&tft, 55, 430, 90, 85, WHITE, YELLOW, BLACK, "BOT", 3);
SW14_btn.initButton(&tft, 160, 430, 90, 85, WHITE, YELLOW, BLACK, "TOP", 3);
SW15_btn.initButton(&tft, 265, 430, 90, 85, WHITE, YELLOW, BLACK, "EXT", 3);

//-----------------------------------------------------------------------------------

SW1_btn.drawButton(false);
SW2_btn.drawButton(false);
SW3_btn.drawButton(false);
SW4_btn.drawButton(false);
SW5_btn.drawButton(false);
SW6_btn.drawButton(false);
SW7_btn.drawButton(false);
SW8_btn.drawButton(false);
SW9_btn.drawButton(false);
SW10_btn.drawButton(false);
SW11_btn.drawButton(false);
SW12_btn.drawButton(false);
SW13_btn.drawButton(false);
SW14_btn.drawButton(false);
SW15_btn.drawButton(false);

releaseKey();
}


void loop(void)
{
bool down = Touch_getXY();

//---------------------------------------------------------------------------------

SW1_btn.press(down && SW1_btn.contains(pixel_x, pixel_y));
SW2_btn.press(down && SW2_btn.contains(pixel_x, pixel_y));
SW3_btn.press(down && SW3_btn.contains(pixel_x, pixel_y));
SW4_btn.press(down && SW4_btn.contains(pixel_x, pixel_y));
SW5_btn.press(down && SW5_btn.contains(pixel_x, pixel_y));
SW6_btn.press(down && SW6_btn.contains(pixel_x, pixel_y));
SW7_btn.press(down && SW7_btn.contains(pixel_x, pixel_y));
SW8_btn.press(down && SW8_btn.contains(pixel_x, pixel_y));
SW9_btn.press(down && SW9_btn.contains(pixel_x, pixel_y));
SW10_btn.press(down && SW10_btn.contains(pixel_x, pixel_y));
SW11_btn.press(down && SW11_btn.contains(pixel_x, pixel_y));
SW12_btn.press(down && SW12_btn.contains(pixel_x, pixel_y));
SW13_btn.press(down && SW13_btn.contains(pixel_x, pixel_y));
SW14_btn.press(down && SW14_btn.contains(pixel_x, pixel_y));
SW15_btn.press(down && SW15_btn.contains(pixel_x, pixel_y));

//--------------------------------------------------------------

if (SW1_btn.justReleased())
SW1_btn.drawButton();

if (SW2_btn.justReleased())
SW2_btn.drawButton();

if (SW3_btn.justReleased())
SW3_btn.drawButton();

if (SW4_btn.justReleased())
SW4_btn.drawButton();

if (SW5_btn.justReleased())
SW5_btn.drawButton();

if (SW6_btn.justReleased())
SW6_btn.drawButton();

if (SW7_btn.justReleased())
SW7_btn.drawButton();

if (SW8_btn.justReleased())
SW8_btn.drawButton();

if (SW9_btn.justReleased())
SW9_btn.drawButton();

if (SW10_btn.justReleased())
SW10_btn.drawButton();

if (SW11_btn.justReleased())
SW11_btn.drawButton();

if (SW12_btn.justReleased())
SW12_btn.drawButton();

if (SW13_btn.justReleased())
SW13_btn.drawButton();

if (SW14_btn.justReleased())
SW14_btn.drawButton();

if (SW15_btn.justReleased())
SW15_btn.drawButton();

// --------------Button Output to USB------------------------

if (SW1_btn.justPressed()) {
SW1_btn.drawButton(true);
buf[2] = KEY_N1;
Serial.write(buf,8);
releaseKey();
}

if (SW2_btn.justPressed()) {
SW2_btn.drawButton(true);
buf[2] = KEY_N2;
Serial.write(buf,8);
releaseKey();
}

if (SW3_btn.justPressed()) {
SW3_btn.drawButton(true);
buf[2] = KEY_N3;
Serial.write(buf,8);
releaseKey();
}

if (SW4_btn.justPressed()) {
SW4_btn.drawButton(true);
buf[2] = KEY_N4;
Serial.write(buf,8);
releaseKey();
}

if (SW5_btn.justPressed()) {
SW5_btn.drawButton(true);
buf[2] = KEY_N5;
Serial.write(buf,8);
releaseKey();
}

if (SW6_btn.justPressed()) {
SW6_btn.drawButton(true);
buf[2] = KEY_N6;
Serial.write(buf,8);
releaseKey();
}

if (SW7_btn.justPressed()) {
SW7_btn.drawButton(true);
buf[2] = KEY_N7;
Serial.write(buf,8);
releaseKey();
}

if (SW8_btn.justPressed()) {
SW8_btn.drawButton(true);
buf[2] = KEY_N8;
Serial.write(buf,8);
releaseKey();
}

if (SW9_btn.justPressed()) {
SW9_btn.drawButton(true);
buf[2] = KEY_N9;
Serial.write(buf,8);
releaseKey();
}

if (SW10_btn.justPressed()) {
SW10_btn.drawButton(true);
buf[2] = KEY_F1;
Serial.write(buf,8);
releaseKey();
}

if (SW11_btn.justPressed()) {
SW11_btn.drawButton(true);
buf[2] = KEY_F2;
Serial.write(buf,8);
releaseKey();
}

if (SW12_btn.justPressed()) {
SW12_btn.drawButton(true);
buf[2] = KEY_F3;
Serial.write(buf,8);
releaseKey();
}

if (SW13_btn.justPressed()) {
SW13_btn.drawButton(true);
buf[2] = KEY_F4;
Serial.write(buf,8);
releaseKey();
}

if (SW14_btn.justPressed()) {
SW14_btn.drawButton(true);
buf[2] = KEY_F5;
Serial.write(buf,8);
releaseKey();
}

if (SW15_btn.justPressed()) {
SW15_btn.drawButton(true);
buf[2] = KEY_F6;
Serial.write(buf,8);
releaseKey();
}

}

void releaseKey ()
{
delay(150);

buf[0] =0;
buf[2] =0;
Serial.write(buf, 8); //Release Key ********************

}

#endif

----------------------------End of Code----------------------------------------

I do need to point out that after the code has been uploaded to the UNO, the USB interface of the UNO has to be reprogrammed for it to be recognised as a HID keyboard device. Only UNOs using the 16U2 interface chip can be reprogrammed, the HID keyboard firmware and Howto is available from the Arduino website.

Phil, M0PIT

Phil

This should be written up for a CQ-TV article. As the owner of a Streamdeck (a gratefully received Christmas present) I appreciate how useful they are and your design offers as good performance at a fraction of the cost.

Definitely deserves wider publicity.

Clive G3GJA

Thanks Phil...
First time Arduino user..
Getting there and looking good

Robert