This was a project for a friend who wanted a fake radar for his costume. It uses the SparkFun "Huge" LCD (T6936 controller), graphic LCD backpack, and Arduino Uno R3. This is my first Arduino project and first LCD project, so if you have any input let me know.
First video...
Second video, with changes that he requested.
Here's the code with comments.
byte c = 0, x1 = 0, x2 = 0, z = 0;
void StartDim()
{
long randLong = 0;
byte randByte = 0;
for (int r = 0; r < 50; r = r + 1)
{
randLong = random(0, 100);
randByte = byte(randLong);
Serial.write(0x7c);
Serial.write(0x02);
Serial.write(randByte);
delay(50);
}
Serial.write(0x7c);
Serial.write(0x02);
Serial.write(0x64);//Set backlight back to 100
}
void DrawGrid()
{
for (byte dgx = 0; dgx < 159; dgx = dgx + 16)//Draw x grid line
{
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(dgx);//x
Serial.write(z);//y0
Serial.write(dgx);//x
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
}
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(0x9f);//x
Serial.write(z);//y0
Serial.write(0x9f);//x
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
for (byte dgy = 0; dgy < 127; dgy = dgy + 16)//Draw y grid line
{
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(z);//x0
Serial.write(dgy);//y
Serial.write(0x9f);//x159
Serial.write(dgy);//y
Serial.write(0x1);//draw
}
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(z);//x0
Serial.write(0x7f);//y
Serial.write(0x9f);//x159
Serial.write(0x7f);//y
Serial.write(0x1);//draw
}
void DrawLines()
{
//Draw 1
Serial.write(0x7c);
Serial.write(0xc);
if (c == 0)
Serial.write(x1++);//x0
else
Serial.write(x1--);//x159
Serial.write(z);//y0
if (c == 0)
Serial.write(x2++);//x0
else
Serial.write(x2--);//x159
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
//Draw 2
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(x1);//x1
Serial.write(z);//y0
Serial.write(x2);//x1
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
}
void EraseLines()
{
int glt = 0, modx1 = 0, modx2 = 0;
modx1 = x1 % 16;
modx2 = x2 % 16;
if (glt != modx1)//Do not erase x axis grid lines
{
//Erase 1
Serial.write(0x7c);
Serial.write(0xc);
if (c == 0)
Serial.write(--x1);//x0
else
Serial.write(++x1);//x159
Serial.write(z);//y0
if (c == 0)
Serial.write(--x2);//x0
else
Serial.write(++x2);//x159
Serial.write(0x7f);//y127
Serial.write(z);//erase
for (byte dgy = 0; dgy < 127; dgy = dgy + 16)//Draw y grid dots that were erased
{
Serial.write(0x7c);
Serial.write(0x10);
Serial.write(x1);//x0
Serial.write(dgy);//y
Serial.write(0x1);//draw
}
//Draw 127
Serial.write(0x7c);
Serial.write(0x10);
Serial.write(x2);//x0
Serial.write(0x7f);//y
Serial.write(0x1);//draw
}
//Draw 0
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(z);//x159
Serial.write(z);//y0
Serial.write(z);//x159
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
//Draw 159
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(0x9f);//x159
Serial.write(z);//y0
Serial.write(0x9f);//x159
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
if (glt != modx2)//Do not erase x axis grid lines
{
//Erase 2
Serial.write(0x7c);
Serial.write(0xc);
if (c ==0)
Serial.write(++x1);//x1
else
Serial.write(--x1);//x158
Serial.write(z);//y0
if (c == 0)
Serial.write(++x2);//x1
else
Serial.write(--x2);//x158
Serial.write(0x7f);//y127
Serial.write(z);//erase
for (byte dgy = 0; dgy < 127; dgy = dgy + 16)//Draw y grid dots that were erased
{
Serial.write(0x7c);
Serial.write(0x10);
Serial.write(x2);//x0
Serial.write(dgy);//y
Serial.write(0x1);//draw
}
//Draw 127
Serial.write(0x7c);
Serial.write(0x10);
Serial.write(x2);//x0
Serial.write(0x7f);//y
Serial.write(0x1);//draw
}
//Draw 0
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(z);//x159
Serial.write(z);//y0
Serial.write(z);//x159
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
//Draw 159
Serial.write(0x7c);
Serial.write(0xc);
Serial.write(0x9f);//x159
Serial.write(z);//y0
Serial.write(0x9f);//x159
Serial.write(0x7f);//y127
Serial.write(0x1);//draw
}
void setup()
{
Serial.begin(115200);
StartDim();//Random Dimmer Startup
DrawGrid();//Draw background grid
delay(2000);
}
void loop()
{
if (c == 0)
{
DrawLines();
//Delay: 100 = Too Fast for LCD Refresh Rate, 200 = Too Slow to Watch
delay(140);
EraseLines();
if (x1 == 159)//See if end of screen
c = 1;//Set backwards
}
else
{
DrawLines();
delay(140);
EraseLines();
if (x1 == 0)//See if end of screen
c = 0;//set forwards
}
}
