My custom Golf 5 dashboard

Translated on 05-07-2026, 1:14.

I have installed a 3.5-inch TFT screen in my dashboard.

Translated on 05-07-2026, 1:15.

Hi, that's nice, but isn't the purpose of a forum to put the information there instead of using it as a link farm?

You are invited to use the "Datei auswählen" button below to upload your things.

Translated on 05-07-2026, 1:15.

I thought a link is better because this doesn't consume server resources.
And there's a button to add an image as a link, so...?

Okay, please provide the German text and the Arduino code. I will then translate the text into English and provide only the translation.

22-09-2016, 20:51 Subject: My custom Golf 5 dashboard

[Translating...]

Code:

#define LCD_CS A3 // Chip Select goes to Analog 3
#define LCD_CD A2 // Command/Data goes to Analog 2
#define LCD_WR A1 // LCD Write goes to Analog 1
#define LCD_RD A0 // LCD Read goes to Analog 0
#define LCD_RESET A4 // Can alternately just connect to Arduino's reset pin

#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 GREY 0x5AEB

#define Achtergrond BLACK
#define Voorgrond WHITE
#define Labels MAGENTA
#define Waarden WHITE

#include <mcp_can> // can-bus

#include <SPI> // f.k. for Arduino-1.5.2
#include "Adafruit_GFX.h"// Hardware-specific library
#include <MCUFRIEND_kbv>

MCUFRIEND_kbv tft;

int KleurMeterRand = GREY;
int KleurMeterStreep = WHITE ;

int LaatsteTurboWaarde = 0 , LaatsteRPMWaarde = 0 , LaatsteSnelheidWaarde = 0;

long unsigned int rxId;
unsigned char len = 0;
unsigned char rxBuf[8];

unsigned char rxBufSerieel[16];
//int Ypos=5;
int WaardenGrote=3;

long KmStand=0;
String strSerial="";
String tijd="00:00:00";
String Melding, KnipperLicht,Rem, HexString;
int coolant=0,coolantnew=0, tdruk=0, rpm=0,rpmnew=0 , snelheid=0, SnelheidVorig=0, olie=0,olienew=0 , brandstof=0;
int teller35b , teller351 ;
int uur , minuut , seconde ;
int Scherm=1;

// Meter

float M_SIZE=1;
float Yoffset=3.5;
float Xoffset=1;

float ltx = 0; // Saved x coord of bottom of needle
uint16_t osx = M_SIZE*120, osy = M_SIZE*120; // Saved x & y coords
uint32_t updateTime = 0; // time for next update

int MeterMin=-90 ,MeterMax=90;

int old_analog = -999; // Value last displayed

int value[6] = {0, 0, 0, 0, 0, 0};
int old_value[6] = { -1, -1, -1, -1, -1, -1};
int d = 0;

int NeedleMin=-180;
int NeedleMax=180;
int i2 ;
int j=0;

MCP_CAN CAN0(10); // Set CS to pin 10

void drawBarTurbo (int nPer){
int y = 136;
if(nPer < LaatsteTurboWaarde){
tft.fillRect(10 + nPer, y , LaatsteTurboWaarde - nPer, 10, Achtergrond);
}
else{
tft.fillRect( 10 + LaatsteTurboWaarde, y , nPer - LaatsteTurboWaarde, 10 , WHITE);
}
LaatsteTurboWaarde = nPer;
}

void drawBarRPM (int nPer){
int y = 211;
int factor = 1;
if(nPer < LaatsteRPMWaarde){
tft.fillRect(10 + nPer, y , LaatsteRPMWaarde / factor - nPer / factor, 10, Achtergrond);
}
else{
tft.fillRect( 10 + LaatsteRPMWaarde / factor, y , nPer - LaatsteRPMWaarde / factor, 10 , WHITE);
}
LaatsteRPMWaarde = nPer;
}

void drawBarSnelheid (int nPer){
int y = 270+1;
float factor = 1;
if(nPer < LaatsteSnelheidWaarde){
tft.fillRect(10 + nPer, y , LaatsteSnelheidWaarde * factor - nPer * factor, 10, Achtergrond);
}
else{
tft.fillRect( 10 + LaatsteSnelheidWaarde * factor, y , nPer - LaatsteSnelheidWaarde * factor, 10 , WHITE);
}
LaatsteSnelheidWaarde = nPer;
}

void TFTprint(int X, int Y, uint16_t Kleur ,int tsize, String txt)
{
tft.setTextSize(tsize);
tft.setTextColor(Kleur);
tft.setCursor(X, Y);
tft.print(txt);
}

void plotNaald(int NaaldPunt, float Xoffset, float Yoffset, float M_SIZE ,char Kleur )
{
float sx = cos((NaaldPunt - 90) * 0.0174532925 );
float sy = sin((NaaldPunt - 90) * 0.0174532925 );

uint16_t x1 = sx * M_SIZE*100 + M_SIZE*120*Xoffset;
uint16_t y1 = sy * M_SIZE*100 + M_SIZE*140*Yoffset;

tft.drawLine(120*Xoffset*M_SIZE, 140*Yoffset*M_SIZE, x1, y1, Kleur);
}

void plotKorteNaald(int NaaldPunt, float Xoffset, float Yoffset, float M_SIZE ,char Kleur )
{
float sx = cos((NaaldPunt - 90) * 0.0174532925 );
float sy = sin((NaaldPunt - 90) * 0.0174532925 );
int tl = 20;
uint16_t x0 = sx * (M_SIZE*100 - tl) + M_SIZE*120*Xoffset;
uint16_t y0 = sy * (M_SIZE*100 - tl) + M_SIZE*140*Yoffset;
uint16_t x1 = sx * M_SIZE*100 + M_SIZE*120*Xoffset;
uint16_t y1 = sy * M_SIZE*100 + M_SIZE*140*Yoffset;
tft.drawLine(x0, y0, x1, y1, Kleur);

}

void streepMeter(float Xoffset,float Yoffset,float M_SIZE,int i,int tl)
{

float sx = cos((i - 90) * 0.0174532925 );
float sy = sin((i - 90) * 0.0174532925 );
//tl = +
uint16_t x0 = sx * (M_SIZE*100 + tl) + M_SIZE*120*Xoffset;
uint16_t y0 = sy * (M_SIZE*100 + tl) + M_SIZE*140*Yoffset;
uint16_t x1 = sx * M_SIZE*100 + M_SIZE*120*Xoffset;
uint16_t y1 = sy * M_SIZE*100 + M_SIZE*140*Yoffset;
tft.drawLine(x0, y0, x1, y1, KleurMeterStreep);
}

void WaardeMeter(float Xoffset,float Yoffset,float M_SIZE,int i,String txt)
{
int tl=15;
float sx = cos((i - 90) * 0.0174532925 );
float sy = sin((i - 90) * 0.0174532925 );

uint16_t x0 = sx * (M_SIZE*100 + tl) + M_SIZE*120*Xoffset;
uint16_t y0 = sy * (M_SIZE*100 + tl) + M_SIZE*140*Yoffset;
uint16_t x1 = sx * M_SIZE*100 + M_SIZE*120*Xoffset;
uint16_t y1 = sy * M_SIZE*100 + M_SIZE*140*Yoffset;
int x = x0-txt.length()/2*18;
TFTprint( x, y0-20,Waarden,2,txt);

}

void analogMeter(float Xoffset,float Yoffset,float M_SIZE)
{

// Draw ticks every 5 degrees from -50 to +50 degrees (100 deg. FSD swing)
for (int i = MeterMin; i <MeterMax> vorig)

for ( int j = vorig; j < huidig; j +=1 )
{

//int jj = j * 0.036 - MeterMax;
int jj = j - MeterMax;
plotKorteNaald(jj,Xoffset,Yoffset,M_SIZE,BLUE); }

if (huidig <vorig> huidig; j -=1 )
{
//int jj = j * 0.036 - MeterMax;

int jj = j - MeterMax;
plotKorteNaald(jj,Xoffset,Yoffset,M_SIZE,Achtergrond); }

}

void setup()
{

Serial.begin(115200);
// Serial.println("MCP2515 Library Receive Example...");

tft.reset();

uint16_t identifier = tft.readID();

// tft.begin(37697);
//tft.begin(37672); //test
//tft.begin(0x9325); //test
// tft.begin(0x9481); // 0x9488 3.5inch
tft.begin(identifier);

tft.fillRect(0,0,320,480,Achtergrond);
TFTprint(10,10,Labels,2,"Welkom Bestuurder");
TFTprint(10,30,Labels,2,"Gaspedaal zit rechts");
TFTprint(10,50,Labels,2,"Koppeling zit links");
TFTprint(10,70,RED,2,"Rem .. afblijven");

delay(6000);
CAN0.begin(CAN_100KBPS); // init can bus :

scherm1Opbouw();

teller35b = 10;
teller351=10;

KnipperLicht = "<>";
TFTprint(196,430,YELLOW,3,KnipperLicht);
delay(1000);
TFTprint(196,430,Achtergrond,3,KnipperLicht);
analogWrite(A5,1023);

}
void scherm1Opbouw()
{
tft.fillRect(0,0,320,480,Achtergrond);

TFTprint(5,50,Labels,2,"Coolant/Oil");
TFTprint(5,85,Labels,2,"Turbo");
TFTprint(130,85,Labels,2,"Fuel");
TFTprint(5,125,Labels,2,"RPM");
M_SIZE=1;
Yoffset=2.9;
Xoffset=1.2;
analogMeter(Xoffset,Yoffset,M_SIZE);

for (int i = 0; i < 5000; i += 100)
{
j = i * 0.036 - MeterMax;
int tl = 10;
if ( i == 1000 or i == 1500 or i == 2000 or i == 2500 or i == 3000 or i == 3500 or i == 4000 ) {tl=20;}
if ( i == 2500) {WaardeMeter(Xoffset,Yoffset,M_SIZE,j,"2500");}
streepMeter(Xoffset,Yoffset,M_SIZE,j,tl);
}
}

void scherm1Waarden()
{

CAN0.readMsgBuf(&len, rxBuf); // Read data: len = data length, buf = data byte(s)
rxId = CAN0.getCanId(); // Get message ID
if ( rxId == 0x10 )
{
// vanaf andere arduino
}

if ( rxId == 0x621 )
{
// byte 0 handrem geeft 20
// ook wellicht deur

TFTprint(190,85,Achtergrond,WaardenGrote,String(brandstof));
brandstof = rxBuf[3] ;
bitWrite(brandstof,7,0);
TFTprint(190,85,Waarden,WaardenGrote,String(brandstof));
TFTprint(210,150,Achtergrond,6,"T");
if ( brandstof <6> 1 )
{
teller35b = 0;
coolantnew = (rxBuf[3]-32)/1.8;
if (coolant-coolantnew>2 or coolant-coolantnew<2>20 or rpmnew-rpm<20 )
{
TFTprint(60,125,Achtergrond,WaardenGrote,String(rpm));
MeterWaarde(rpm * 0.036,rpmnew * 0.036);
rpm=rpmnew;
if ( rpm <4000> 1700) {TFTprint(60,125,Waarden,WaardenGrote,String(rpm));}
if ( rpm <1700> 4000 ) {TFTprint(60,125,MAGENTA,WaardenGrote,String(rpm));}

}
}
}

if ( rxId == 0x555 )
{

TFTprint(70,85,Achtergrond,WaardenGrote,String(tdruk));
tdruk = rxBuf[4];
TFTprint(70,85,Waarden,WaardenGrote,String(tdruk));

olienew = (rxBuf[7]-32)/1.8;
if (olienew-olie>2 or olienew-olie<2> 1)
// if ( SnelheidVorig != snelheid )
{
teller351=0;

snelheid=(rxBuf[2]*256+(rxBuf[1]-1))/200;
//MeterWaarde(SnelheidVorig,snelheid);
TFTprint(100,350,Achtergrond,6,String(SnelheidVorig));
TFTprint(100,350,Waarden,6,String(snelheid));
SnelheidVorig = snelheid;
}

}

if ( rxId == 0x65D )
{
TFTprint(5,12,Achtergrond,3,String(KmStand));
KmStand=(rxBuf[3]*65536+rxBuf[2]*256+rxBuf[1]);
TFTprint(5,12,Waarden,3,String(KmStand));

uur=00 ; minuut=00 ; seconde=00 ;
bitWrite(uur,4,bitRead(rxBuf[6],0));
bitWrite(uur,3,bitRead(rxBuf[5],7));
bitWrite(uur,2,bitRead(rxBuf[5],6));
bitWrite(uur,1,bitRead(rxBuf[5],5));
bitWrite(uur,0,bitRead(rxBuf[5],4));

bitWrite(minuut,5,bitRead(rxBuf[6],6));
bitWrite(minuut,4,bitRead(rxBuf[6],5));
bitWrite(minuut,3,bitRead(rxBuf[6],4));
bitWrite(minuut,2,bitRead(rxBuf[6],3));
bitWrite(minuut,1,bitRead(rxBuf[6],2));
bitWrite(minuut,0,bitRead(rxBuf[6],1));

// bitWrite(seconde,5,bitRead(rxBuf[7],4));
// bitWrite(seconde,4,bitRead(rxBuf[7],3));
// bitWrite(seconde,3,bitRead(rxBuf[7],2));
// bitWrite(seconde,2,bitRead(rxBuf[7],1));
// bitWrite(seconde,1,bitRead(rxBuf[7],0));
// bitWrite(seconde,0,bitRead(rxBuf[6],7));

TFTprint(216,12,Achtergrond,3,tijd);
tijd = String(uur) + ":" + String(minuut) ;
TFTprint(216,12,Waarden,3,tijd);
}

if ( rxId == 0x531 )
{
TFTprint(6,430,Achtergrond,4,Melding);
TFTprint(196,430,Achtergrond,6,KnipperLicht);

if ( ( rxBuf[1] == 0x11 ) or ( rxBuf[1] == 0x51 ) )
{
KnipperLicht = "<TFTprint> 1 )
{
teller35b = 0;
coolantnew = (rxBuf[3]-32)/1.8;
if (coolant-coolantnew>2 or coolant-coolantnew<2>20 or rpmnew-rpm<20 )
{
TFTprint(60,160,Achtergrond,6,String(rpm));
rpm=rpmnew;
if ( rpm <4000> 1700) {TFTprint(60,160,Waarden,6,String(rpm));}
if ( rpm <1700> 4000 ) {TFTprint(60,160,MAGENTA,6,String(rpm));}
drawBarRPM(rpm/20);

}
}
}

if ( rxId == 0x555 )
{

TFTprint(70,85,Achtergrond,6,String(tdruk));
tdruk = rxBuf[4];
TFTprint(70,85,Waarden,6,String(tdruk));
drawBarTurbo(String(tdruk).toInt());

olienew = (rxBuf[7]-32)/1.8;
if (olienew-olie>2 or olienew-olie<2> 1)
// if ( SnelheidVorig != snelheid )
{
teller351=0;

snelheid=(rxBuf[2]*256+(rxBuf[1]-1))/200;
drawBarSnelheid(snelheid);
//MeterWaarde(SnelheidVorig,snelheid);
TFTprint(80,350,Achtergrond,10,String(SnelheidVorig));
TFTprint(80,350,Waarden,10,String(snelheid));
SnelheidVorig = snelheid;
}

}

if ( rxId == 0x65D )
{
TFTprint(5,12,Achtergrond,3,String(KmStand));
KmStand=(rxBuf[3]*65536+rxBuf[2]*256+rxBuf[1]);
TFTprint(5,12,Waarden,3,String(KmStand));

uur=00 ; minuut=00 ; seconde=00 ;
bitWrite(uur,4,bitRead(rxBuf[6],0));
bitWrite(uur,3,bitRead(rxBuf[5],7));
bitWrite(uur,2,bitRead(rxBuf[5],6));
bitWrite(uur,1,bitRead(rxBuf[5],5));
bitWrite(uur,0,bitRead(rxBuf[5],4));

bitWrite(minuut,5,bitRead(rxBuf[6],6));
bitWrite(minuut,4,bitRead(rxBuf[6],5));
bitWrite(minuut,3,bitRead(rxBuf[6],4));
bitWrite(minuut,2,bitRead(rxBuf[6],3));
bitWrite(minuut,1,bitRead(rxBuf[6],2));
bitWrite(minuut,0,bitRead(rxBuf[6],1));

// bitWrite(seconde,5,bitRead(rxBuf[7],4));
// bitWrite(seconde,4,bitRead(rxBuf[7],3));
// bitWrite(seconde,3,bitRead(rxBuf[7],2));
// bitWrite(seconde,2,bitRead(rxBuf[7],1));
// bitWrite(seconde,1,bitRead(rxBuf[7],0));
// bitWrite(seconde,0,bitRead(rxBuf[6],7));

TFTprint(216,12,Achtergrond,3,tijd);
tijd = String(uur) + ":" + String(minuut) ;
TFTprint(216,12,Waarden,3,tijd);
}

if ( rxId == 0x531 )
{
TFTprint(6,430,Achtergrond,4,Melding);
TFTprint(196,430,Achtergrond,6,KnipperLicht);

if ( ( rxBuf[1] == 0x11 ) or ( rxBuf[1] == 0x51 ) )
{
KnipperLicht = "<";
TFTprint(196,430,YELLOW,6,KnipperLicht);
}

if (( rxBuf[1] == 0x12 ) or ( rxBuf[1] == 0x52 ) )
{
KnipperLicht = ">";
TFTprint(196,430,YELLOW,6,KnipperLicht);
}

if ( rxBuf[0] == 0x0 )
{
Melding = "L";
TFTprint(6,430,RED,4,Melding);
}

if ( rxBuf[0] == 0xc3 )
{
Melding = "L";
TFTprint(6,430,GREEN,4,Melding);
}
}

}

void logserieel()
{
Serial.println("");
Serial.print(rxId,HEX);
Serial.print(",");
for(int i = 0; i<len; i++) // Print each byte of the data
{
if(rxBuf[i] < 0x10) // If data byte is less than 0x10, add a leading zero
{
Serial.print("0");
}
Serial.print(rxBuf[i],HEX);
Serial.print(",");
}
}

void logscherm()
{
// TFTprint(0,265,Achtergrond,2,HexString);
// HexString = String(rxBuf[0], HEX) + " "+String(rxBuf[1], HEX) + " "+String(rxBuf[2], HEX) + " "+String(rxBuf[3], HEX) + " "+String(rxBuf[4], HEX) + " " + String(rxBuf[5], HEX) + " " + String(rxBuf[6], HEX) + " " + String(rxBuf[7], HEX) ;
// TFTprint(0,265,Waarden,2,HexString);
}

void loop()
{

if ( analogRead(A5) == 0 )
{
Scherm++ ;
delay(500);
analogWrite(A5,1023);
tft.fillRect(0,0,320,480,Achtergrond);
if ( Scherm == 3 ){Scherm = 1;}
if (Scherm == 1 ) { scherm1Opbouw(); }
if (Scherm == 2 ) { scherm2Opbouw(); }
}

if (Scherm == 1 ) { scherm1Waarden() ; }
if (Scherm == 2 ) { scherm2Waarden() ; }

}

Translated on 05-07-2026, 1:16.

"Looks very nice, what information can you display on your TFT screen?"

Best, Rainer.

CAN-Diagnose · Translated on 05-07-2026, 1:16.

I can show everything, but I would need to know what all the CAN-bus messages mean.
At this moment, I am showing:
kilometers the car has driven.
time
coolant temperature
oil temperature
turbo pressure
fuel status
rpm
speed

Translated on 05-07-2026, 1:17.

Very interesting. Congratulations on your ingenuity and hard work.

Translated on 05-07-2026, 1:17.

Hello,

Welches CAN-Bus-Shield verwenden Sie? It has two CAN interfaces or only one?

Sure, here's the translation:

"Thanks."

Translated on 05-07-2026, 1:17.

Cool.

Translated on 05-07-2026, 1:17.

Wow! It looks very nice!

"I respect your work and thank you very much for the code!"