Performance Box

Performance Box
17/01/2019 Ernestas Konopliovas
In Arduino

This project goal was to measure vehicle performance of acceleration. Main parameters to get were: 0-60 km/h acceleration, 0-100 km/h acceleration, 0-200 km/h acceleration and 400m timing.

For hardware I used Arduino Nano board (mainly because of it’s size), Freematics OBD II Adapter (to read speed data of vehicle) and small led screen to display info. Here is the result.

How it looks like
Code, I used
#include <Arduino.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <MicroLCD.h>
#include <OBD.h>
#include "config.h"
#if USE_SOFTSERIAL
#include <SoftwareSerial.h>
#endif
#include "datalogger.h"

// logger states
#define STATE_SD_READY 0x1
#define STATE_OBD_READY 0x2
#define STATE_SLEEPING 0x20

static uint32_t lastFileSize = 0;
static int lastSpeed = -1;
static uint32_t lastSpeedTime = 0;
static int speed = 0;
static uint32_t distance = 0;
static uint16_t fileIndex = 0;
static uint32_t startTime = 0;

#define STAGE_IDLE 0
#define STAGE_WAIT_START 1
#define STAGE_MEASURING 2

static byte stage = STAGE_IDLE;

#define SPEED_THRESHOLD_1 60 /* kph */
#define SPEED_THRESHOLD_2 100 /* kph */
#define SPEED_THRESHOLD_3 200 /* kph */
#define DISTANCE_THRESHOLD 400 /* meters */

static uint16_t times[4] = {0};

#if ENABLE_DATA_LOG
class COBDLogger : public COBD, public CDataLogger
#else
class COBDLogger : public COBD
#endif
{
public:
COBDLogger():state(0) {}

void setup(){
#if ENABLE_DATA_LOG
if (!(state & STATE_SD_READY)) {
if (checkSD()) {
state |= STATE_SD_READY;
showStates();
}
}
#endif

        do {
showStates();
} while (!init());

        state |= STATE_OBD_READY;

        showStates();

#if ENABLE_DATA_LOG
uint16_t index = openFile(LOG_TYPE_DEFAULT);
lcd.print("File ID:");
if (index) {
lcd.setFlags(FLAG_PAD_ZERO);
lcd.printInt(index, 5);
lcd.setFlags(0);
} else {
lcd.print("N/A");
}
#endif

        initTimerScreen();
}
void loop()
{
static byte index = 0;
static byte index2 = 0;
static byte index3 = 0;

        timerLoop();

#if ENABLE_DATA_LOG
// flush SD data every 1KB
if (dataSize - lastFileSize >= 1024 && stage != STAGE_MEASURING) {
flushFile();
lastFileSize = dataSize;
// display logged data size
}
#endif

        if (errors >= 2) {
reconnect();
}
}
#if ENABLE_DATA_LOG
bool checkSD()
{
Sd2Card card;
SdVolume volume;
lcd.setCursor(0, 0);
lcd.setFontSize(FONT_SIZE_MEDIUM);
state &= ~STATE_SD_READY;
pinMode(SS, OUTPUT);
if (card.init(SPI_HALF_SPEED, SD_CS_PIN)) {
const char* type;
char buf[20];

            switch(card.type()) {
case SD_CARD_TYPE_SD1:
type = "SD1";
break;
case SD_CARD_TYPE_SD2:
type = "SD2";
break;
case SD_CARD_TYPE_SDHC:
type = "SDHC";
break;
default:
type = "SDx";
}

            lcd.clear();
lcd.print(type);
lcd.write(' ');
if (!volume.init(card)) {
lcd.print("No FAT!");
return false;
}

            uint32_t volumesize = volume.blocksPerCluster();
volumesize >>= 1; // 512 bytes per block
volumesize *= volume.clusterCount();
volumesize >>= 10;

            sprintf(buf, "%dGB", (int)((volumesize + 511) / 1000));
lcd.print(buf);
} else {
lcd.clear();
lcd.print("SD");
lcd.draw(cross, 32, 0, 16, 16);
return false;
}

        if (!SD.begin(SD_CS_PIN)) {
lcd.setCursor(48, 0);
lcd.print("Bad SD");
return false;
}

        state |= STATE_SD_READY;
return true;
}
#endif
private:
void dataIdleLoop()
{
if (state & STATE_SLEEPING) return;

        if (getState() == OBD_CONNECTED)
return;

        // called while initializing
char buf[10];
unsigned int t = (millis() - startTime) / 1000;
sprintf(buf, "%02u:%02u", t / 60, t % 60);
lcd.setFontSize(FONT_SIZE_SMALL);
lcd.setCursor(97, 7);
lcd.print(buf);
}
void timerLoop()
{
uint32_t elapsed = millis() - startTime;
uint16_t n;
#if !ENABLE_DATA_LOG
uint32_t dataTime;
#endif
int speed;
if (!readPID(PID_SPEED, speed))
return;

        dataTime = millis();
#if ENABLE_DATA_LOG
logData(0x100 | PID_SPEED, speed);

        int rpm = 0;
if (read(PID_RPM, rpm)) {
dataTime = millis();
logData(0x100 | PID_RPM, rpm);
}
#endif

        lcd.setFontSize(FONT_SIZE_XLARGE);
// estimate distance
distance += (uint32_t)(speed + lastSpeed) * (dataTime - lastSpeedTime) / 2 / 3600;

        if (lastSpeed != speed) {
lcd.setCursor(0, 4);
lcd.printInt((unsigned int)speed % 1000, 3);
lastSpeed = speed;
}

        lastSpeedTime = dataTime;

        if (stage == STAGE_WAIT_START) {
if (speed > 0) {
stage = STAGE_MEASURING;
startTime = lastSpeedTime;

#if ENABLE_DATA_LOG
uint32_t t = dataTime;
dataTime = lastSpeedTime;
logData(0x100 | PID_SPEED, lastSpeed);
dataTime = t;
logData(0x100 | PID_SPEED, speed);
#endif

                lastSpeed = 0;
distance = 0;

                memset(times, 0, sizeof(times));

                initTimerScreen();
}
} else if (stage == STAGE_MEASURING) {
// display elapsed time (mm:ss:mm)
n = elapsed / 1000;
if (n < 100) { lcd.setCursor(0, 0); lcd.printInt(n, 2); n = (elapsed % 1000) / 100; lcd.setFontSize(FONT_SIZE_MEDIUM); lcd.setCursor(32, 1); lcd.write('.'); lcd.write('0' + n); } if (times[2] == 0 && speed >= SPEED_THRESHOLD_3) {
times[2] = elapsed / 100;
stage = STAGE_IDLE;
lcd.clear(0, 0, 128, 24);
showTimerResults();
lcd.setFontSize(FONT_SIZE_MEDIUM);
lcd.setCursor(0, 0);
lcd.print("DONE!");
} else if (times[1] == 0 && speed >= SPEED_THRESHOLD_2) {
times[1] = elapsed / 100;
showTimerResults();
} else if (times[0] == 0 && speed >= SPEED_THRESHOLD_1) {
times[0] = elapsed / 100;
showTimerResults();
} else if (speed == 0) {
// speed go back to 0
stage = STAGE_IDLE;
}
if (distance > 0) {
lcd.setFontSize(FONT_SIZE_SMALL);
lcd.setCursor(62, 6);
if (distance >= 400) {
lcd.printInt(400, 3);
if (!times[3]) {
times[3] = elapsed / 100;
showTimerResults();
}
} else {
lcd.printInt(distance, 3);
}
}
#if ENABLE_DATA_LOG
// log speed data
logData(0x100 | PID_SPEED, speed);
// log additional data
int rpm;
if (read(PID_RPM, rpm)) {
dataTime = millis();
logData(0x100 | PID_RPM, rpm);
}
#endif
} else {
if (speed == 0) {
stage = STAGE_WAIT_START;
initTimerScreen();
lcd.setFontSize(FONT_SIZE_MEDIUM);
lcd.setCursor(0, 0);
lcd.println(" GET");
lcd.println("READY");
delay(500);
}
}
}
void reconnect()
{
#if ENABLE_DATA_LOG
closeFile();
#endif
lcd.clear();
lcd.setFontSize(FONT_SIZE_MEDIUM);
lcd.print("Reconnecting");
startTime = millis();
state &= ~STATE_OBD_READY;
state |= STATE_SLEEPING;
//digitalWrite(SD_CS_PIN, LOW);
for (int i = 0; !init(); i++) {
if (i == 10) lcd.clear();
}
state &= ~STATE_SLEEPING;
fileIndex++;
setup();
}
byte state;

    // screen layout related stuff
void showStates()
{
lcd.setFontSize(FONT_SIZE_SMALL);
lcd.setCursor(0, 3);
if (state & STATE_OBD_READY) {
lcd.println("OBD connected!   ");
} else {
lcd.println("Connecting OBD...");
}
}
void showTimerResults()
{
lcd.setFontSize(FONT_SIZE_SMALL);
lcd.setCursor(56, 0);
lcd.print(" 0~60:  --");
lcd.setCursor(56, 2);
lcd.print("0~100:  --");
lcd.setCursor(56, 4);
lcd.print("0~200:  --");
lcd.setCursor(56, 6);
lcd.print(" 400m:  --");
lcd.setFontSize(FONT_SIZE_MEDIUM);
char buf[8];
if (times[0]) {
sprintf(buf, "%2d.%1d", times[0] / 10, times[0] % 10);
Serial.println(times[0]);
lcd.setCursor(92, 0);
lcd.print(buf);
}
if (times[1]) {
sprintf(buf, "%2d.%1d", times[1] / 10, times[1] % 10);
Serial.println(buf);
lcd.setCursor(92, 2);
lcd.print(buf);
}
if (times[2]) {
sprintf(buf, "%2d.%1d", times[2] / 10, times[2] % 10);
Serial.println(buf);
lcd.setCursor(92, 4);
lcd.print(buf);
}
if (times[3]) {
sprintf(buf, "%2d.%1d", times[3] / 10, times[3] % 10);
Serial.println(buf);
lcd.setCursor(92, 6);
lcd.print(buf);
}
}
void initTimerScreen()
{
lcd.clear();
showTimerResults();
lcd.setFontSize(FONT_SIZE_SMALL);
lcd.setCursor(24, 7);
lcd.print("km/h");
}
};

static COBDLogger logger;

void setup()
{
#ifdef DEBUG
DEBUG.begin(DEBUG_BAUDRATE);
#endif

    lcd.begin();
lcd.setFontSize(FONT_SIZE_MEDIUM);
lcd.println("PerformanceBox");

    logger.begin();
#if ENABLE_DATA_LOG
logger.initSender();
logger.checkSD();
#endif
logger.setup();
}

void loop()
{
logger.loop();
}

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