Usermod: Project Cars rpm indicator and shift lights (#759)

* project cars shiftlight usermod

* added readme

* rephrased stuff in readme.md because reasons

Co-authored-by: Jan <jan.wingefeld@gmail.com>
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### Shift Light for Project Cars
Turn your WLED lights into a rev light and shift indicator for Project Cars.
It is pretty straight forward to use.
1. Make sure, your WLED device and your PC/console are on the same network and can talk to each other
2. Go to the gameplay settings menu in PCARS and enable UDP. There are 9 numbers you can choose from. This is the refresh rate. The lower the number, the better. But you might run into problems at faster rates.
| Number | Updates/Second |
| ------ | -------------- |
| 1 | 60 |
| 2 | 50 |
| 3 | 40 |
| 4 | 30 |
| 5 | 20 |
| 6 | 15 |
| 7 | 10 |
| 8 | 05 |
| 9 | 1 |
3. once you enter a race, WLED should automatically shift to PCARS mode. Done.

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/*
* Car rev display and shift indicator for Project Cars
*
* This works via the UDP telemetry function. You'll need to enable it in the settings of the game.
* I've had good results with settings around 5 (20 fps).
*
*/
const uint8_t PCARS_dimcolor = 20;
WiFiUDP UDP;
const unsigned int PCARS_localUdpPort = 5606; // local port to listen on
char PCARS_packet[2048];
char PCARS_tempChar[2]; // Temporary array for u16 conversion
u16 PCARS_RPM;
u16 PCARS_maxRPM;
long PCARS_lastRead = millis() - 2001;
float PCARS_rpmRatio;
void userSetup()
{
UDP.begin(PCARS_localUdpPort);
}
void userConnected()
{
// new wifi, who dis?
}
void userLoop()
{
PCARS_readValues();
if (PCARS_lastRead > millis() - 2000) {
PCARS_buildcolorbars();
}
}
void PCARS_readValues() {
int PCARS_packetSize = UDP.parsePacket();
if (PCARS_packetSize) {
int len = UDP.read(PCARS_packet, PCARS_packetSize);
if (len > 0) {
PCARS_packet[len] = 0;
}
if (len == 1367) { // Telemetry packet. Ignoring everything else.
PCARS_lastRead = millis();
arlsLock(realtimeTimeoutMs, REALTIME_MODE_GENERIC);
// current RPM
memcpy(&PCARS_tempChar, &PCARS_packet[124], 2);
PCARS_RPM = (PCARS_tempChar[1] << 8) + PCARS_tempChar[0];
// max RPM
memcpy(&PCARS_tempChar, &PCARS_packet[126], 2);
PCARS_maxRPM = (PCARS_tempChar[1] << 8) + PCARS_tempChar[0];
if (PCARS_maxRPM) {
PCARS_rpmRatio = constrain((float)PCARS_RPM / (float)PCARS_maxRPM, 0, 1);
} else {
PCARS_rpmRatio = 0.0;
}
}
}
}
void PCARS_buildcolorbars() {
boolean activated = false;
float ledratio = 0;
for (uint16_t i = 0; i < ledCount; i++) {
if (PCARS_rpmRatio < .95 || (millis() % 100 > 70 )) {
ledratio = (float)i / (float)ledCount;
if (ledratio < PCARS_rpmRatio) {
activated = true;
} else {
activated = false;
}
if (ledratio > 0.66) {
setRealtimePixel(i, 0, 0, PCARS_dimcolor + ((255 - PCARS_dimcolor)*activated), 0);
} else if (ledratio > 0.33) {
setRealtimePixel(i, PCARS_dimcolor + ((255 - PCARS_dimcolor)*activated), 0, 0, 0);
} else {
setRealtimePixel(i, 0, PCARS_dimcolor + ((255 - PCARS_dimcolor)*activated), 0, 0);
}
}
else {
setRealtimePixel(i, 0, 0, 0, 0);
}
}
colorUpdated(5);
strip.show();
}