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/*************************************************************************
* Sample sketch based on OBD-II library for Arduino
* Using a LCD1602 shield to display realtime vehicle data
* Distributed under GPL v2.0
* Copyright (c) 2012 Stanley Huang <stanleyhuangyc@gmail.com>
* All rights reserved.
*************************************************************************/
#include <arduino.h>
#include <LCD4Bit_mod.h>
#include <OBD.h>
//create object to control an LCD.
LCD4Bit_mod lcd = LCD4Bit_mod(2);
COBD obd;
//Key message
unsigned int adc_key_val[5] ={30, 150, 360, 535, 760 };
int NUM_KEYS = 5;
int adc_key_in;
char key=-1;
char oldkey=-1;
unsigned long lastTick = millis();
uint8_t modes[2] = {0, 2};
const char modePids[] = {PID_RPM, PID_SPEED, PID_THROTTLE, PID_ENGINE_LOAD,
PID_COOLANT_TEMP, PID_INTAKE_TEMP, PID_AMBIENT_TEMP, PID_MAF_FLOW,
PID_ABS_ENGINE_LOAD, PID_FUEL_PRESSURE, PID_INTAKE_PRESSURE, PID_BAROMETRIC,
PID_TIMING_ADVANCE, PID_FUEL_LEVEL, PID_RUNTIME, PID_DISTANCE};
const char* modeLabels[] = {
"Engine rpm", "Speed km/h", "Throttle %", "Engine Load %",
"Coolant C", "Intake Air C", "Env. Temp C", "MAF Flow kpa",
"Abs. Load %", "Fuel kpa", "Intake kpa", "Barometer kpa",
"Timing Adv. ", "Fuel Level %", "Run Time", "Distance km"};
const char modePos[] = {8, 8, 11, 12,
11, 11, 11, 9,
11, 9, 9, 10,
12, 11, 8, 10};
const char* modeFmts[] = {"%4u", "%3u", "%3u", "%u",
"%3d", "%3d", "%3d", "%3u",
"%3u", "%3u", "%3u", "%u",
"%3d", "%3u", "%4u:%02u", "%04u"};
#define TOTAL_PIDS (sizeof(modePids) / sizeof(modePids[0]))
// Convert ADC value to key number
char get_key(unsigned int input)
{
char k;
for (k = 0; k < NUM_KEYS; k++) {
if (input < adc_key_val[k])
return k;
}
return -1;
}
void updateMode()
{
lcd.cursorTo(1, 0);
lcd.printIn((char*)modeLabels[modes[0]]);
lcd.cursorTo(2, 0);
lcd.printIn((char*)modeLabels[modes[1]]);
}
bool showData(int index)
{
char buf[16];
int value;
uint8_t mode = modes[index];
uint8_t pid = modePids[mode];
digitalWrite(13, HIGH); // set the LED on
if (!obd.ReadSensor(pid, value)) {
// display received data on error
lcd.cursorTo(index + 1, 0);
lcd.printIn("Error");
delay(2000);
updateMode();
return false;
}
digitalWrite(13, LOW); // set the LED off
if (pid == PID_RUNTIME) {
sprintf(buf, modeFmts[mode], (unsigned int)value / 60, (unsigned int)value % 60);
} else {
sprintf(buf, modeFmts[mode], value);
}
lcd.cursorTo(index + 1, modePos[mode]);
lcd.printIn(buf);
return true;
}
bool setupConnection()
{
uint8_t errors = 0;
char buf[16];
lcd.clear();
lcd.printIn("Connecting...");
while (!obd.Init()) {
lcd.cursorTo(2, 0);
sprintf(buf, "Attempts #%d", ++errors);
lcd.printIn(buf);
}
lcd.clear();
lcd.printIn("Connected!");
delay(1000);
updateMode();
return true;
}
void setup()
{
pinMode(13, OUTPUT); //we'll use the debug LED to output a heartbeat
lcd.init();
OBDUART.begin(OBD_SERIAL_BAUDRATE);
setupConnection();
}
void loop()
{
adc_key_in = analogRead(0); // read the value from the sensor
key = get_key(adc_key_in); // convert into key press
if (key != oldkey) {
delay(50); // wait for debounce time
adc_key_in = analogRead(0); // read the value from the sensor
key = get_key(adc_key_in); // convert into key press
if (key != oldkey)
{
oldkey = key;
if (key >=0){
switch (key) {
case 3: // left key
do {
modes[0] = modes[0] > 0 ? modes[0] - 1 : TOTAL_PIDS - 1;
} while (modes[0] == modes[1]);
break;
case 0: // right key
do {
modes[0] = modes[0] < TOTAL_PIDS - 1 ? modes[0] + 1 : 0;
} while (modes[0] == modes[1]);
break;
case 1: // up key
do {
modes[1] = modes[1] > 0 ? modes[1] - 1 : TOTAL_PIDS - 1;
} while (modes[0] == modes[1]);
break;
case 2: // down key
do {
modes[1] = modes[1] < TOTAL_PIDS - 1 ? modes[1] + 1 : 0;
} while (modes[0] == modes[1]);
break;
}
updateMode();
}
}
}
unsigned long curTick = millis();
if (curTick - lastTick > 500) {
showData(0);
showData(1);
if (obd.errors > 10) {
setupConnection();
}
lastTick = curTick;
}
}
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