Final Arduino code.
#include "Adafruit_MAX31855.h"
#include <LiquidCrystal.h>
#include <PID_v1.h>
#include <phi_big_font.h>
//declare pins
const int thermoCLK = A5;
const int thermoCS = A4;
const int thermoDO = A3;
const int SW_LO = A0;
const int SW_HI = A1;
const int POT = A2;
const int BLK_L = 9;
const int BLK_R = 8;
const int RED_L = 13;
const int RED_R = 12;
const int HEATER = 10;
const int FAN = 11;
//these don't change
const int STAND_BY = 0;
const int PRE_HEAT = 1;
const int GET_BLAZED = 2;
const int COOL_DOWN = 4;
const double cooldownpwm = 0;
const double standbypwm = 32;
const double preheattemp = 340;
const double aggKp=10, aggKi=1, aggKd=0.5;
const double consKp=6, consKi=0.5, consKd=0.5;
//global variables
double avg[10];
double outtemp;
double lasttemp;
double tempreading;
double currenttemp;
unsigned long temptime, screentime, preheattime, cooldowntime, datatime, heatertime, buttontime, splashtime,logtime, nowtime, fantime;
int last_blk_l, last_blk_r, last_red_l, last_red_r, last_sw_hi, last_sw_lo;
char inmode;
//vars with a default value
unsigned int knobreading = 0;
unsigned int lowlimit = 340;
unsigned int highlimit = 420;
unsigned int fan_idle = 128;
unsigned int fan_low = 204;
unsigned int fan_high = 255;
unsigned int fanpwm;
double setpoint = 0;
int mode = 0;
double heaterpwm = 0;
//create objects
Adafruit_MAX31855 thermocouple(thermoCLK, thermoCS, thermoDO);
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
PID yosPID(¤ttemp,&heaterpwm,&setpoint, consKp, consKi, consKd, DIRECT);
void setup() {
init_big_font(&lcd);
Serial.begin(9600);
lcd.begin(20, 2);
TCCR1B = TCCR1B & 0b11111000 | 0x05; //sets heater PWM frequency to 31 hz
TCCR2B = TCCR2B & 0b11111000 | 0x06; //sets fan PWM frequency to 244 hz-
pinMode(10, OUTPUT);
digitalWrite(10, LOW);
pinMode(FAN,OUTPUT);
pinMode(SW_LO,INPUT);
pinMode(SW_HI,INPUT);
pinMode(BLK_L,INPUT);
pinMode(BLK_R,INPUT);
pinMode(RED_L,INPUT);
pinMode(RED_R,INPUT);
delay(2000);
yosPID.SetSampleTime(200);
yosPID.SetOutputLimits(0,240);
standby();
currenttemp = readtemp();
lasttemp = currenttemp;
nowtime = millis();
temptime = nowtime;
screentime = nowtime;
datatime = nowtime;
heatertime = nowtime;
buttontime = nowtime;
splashtime = nowtime;
logtime = nowtime;
fantime = nowtime;
splash();
modechangescreen();
}
void loop() {
nowtime = millis();
if (nowtime - buttontime > 50) //poll button
{
buttoncheck();
buttontime = millis();
}
if (nowtime - temptime > 100) //poll sensor
{
currenttemp = readtemp();
temptime = millis();
}
if (millis() - fantime > 500) //set fan
{
setfan();
fantime = millis();
}
if (nowtime - screentime > 100) //draw screen
{
drawscreen();
screentime = millis();
}
if (mode | 3) { //are we in a PID mode?
yosPID.Compute();
}
if (millis() - heatertime > 100) //set heater
{
settemp();
analogWrite(HEATER, heaterpwm);
heatertime = millis();
}
if (millis() - logtime > 1000) //send log
{
statuslog();
logtime = millis();
}
}
void splash() {
lcd.clear();
lcd.setCursor(0,0);
lcd.print("\"What's in the box?\"");
delay(3000);
lcd.clear();
delay(2000);
lcd.setCursor(7,1);
lcd.print("\"Pain.\"");
delay(3000);
lcd.clear();
char yospos[9] = " YOSPOS ";
char bitch[6] = "BITCH";
lcd.clear();
for (int i = 0;i < 7;i++) {
lcd.setCursor(0,0);
lcd.print(yospos[i]);
lcd.setCursor(0,1);
lcd.print(yospos[i+1]);
delay(500);
}
lcd.clear();
delay(1000);
for(int i = 0; i<10 ;i++) {
invert_big_font(true);
render_big_msg("BITCH",0,0);
delay(300);
invert_big_font(false);
render_big_msg("BITCH",0,0);
delay(300);
}
lcd.clear();
}
void drawscreen(){
if (millis() - splashtime > 2000)
{
if (abs(currenttemp - lasttemp) > 0) {
if (int(outtemp) > 99)
{
render_big_number(int(outtemp),9,0);
}
else
{
render_big_number(0,9,0);
render_big_number(int(outtemp),13,0);
}
lasttemp = currenttemp;
}
lcd.setCursor(0,0);
lcd.print(" ");
lcd.setCursor(0,1);
lcd.print(" ");
lcd.setCursor(0,0);
lcd.print(map(heaterpwm,0,255,0,100));
lcd.setCursor(2,0);
lcd.print("% F");
lcd.setCursor(0,1);
switch (mode) {
case STAND_BY:
lcd.print("STBY");
break;
case PRE_HEAT:
lcd.print("WARM");
break;
case GET_BLAZED:
lcd.print("SMOK");
break;
case COOL_DOWN:
lcd.print("COOL");
break;
}
lcd.setCursor(4,0);
lcd.print(map(analogRead(POT),0,1023,lowlimit,highlimit));
lcd.setCursor(5,1);
lcd.print(map(fanpwm,0,255,0,100));
}
}
void modechangescreen() {
lcd.clear();
switch (mode) {
case STAND_BY:
lcd.setCursor(3,0);
lcd.print("Your Navigator");
lcd.setCursor(4,1);
lcd.print("has awakened.");
break;
case PRE_HEAT:
lcd.setCursor(3,0);
lcd.print("Holtzman Drive");
lcd.setCursor(7,1);
lcd.print("ONLINE");
break;
case GET_BLAZED:
lcd.setCursor(3,0);
lcd.print("SPACEFOLDING.");
break;
case COOL_DOWN:
lcd.setCursor(5,0);
lcd.print("Cooldown.");
break;
}
splashtime = millis();
}
double readtemp() {
tempreading = thermocouple.readFarenheit();
outtemp = avg[0];
for (int i = 0; i < 8; i++)
{
outtemp += avg[i+1];
avg[i+1] = avg[i];
}
avg[0] = tempreading;
outtemp += avg[0];
outtemp *= 0.1;
return outtemp;
}
void buttoncheck() {
knobreading = analogRead(POT);
int current_red_r = digitalRead(RED_R);
if (current_red_r == 0 && current_red_r != last_red_r) //right red button has come down since we last checked
{
delay(10);
if (digitalRead(RED_R) == current_red_r) {
modecycle();
}
}
last_red_r = current_red_r;
int current_red_l = digitalRead(RED_L);
if (current_red_l == 0 && current_red_l != last_red_l) //right red button has come down since we last checked
{
delay(10);
if (digitalRead(RED_L) == current_red_l) {
modecycle(); //sdfdsfdsfsf
}
}
last_red_l = current_red_l;
int current_blk_r = digitalRead(BLK_R);
if (current_blk_r == 0 && current_blk_r != last_blk_r) //right blk button has come down since we last checked
{
delay(10);
if (digitalRead(RED_R) == current_blk_r) {
modecycle();
}
}
last_blk_r = current_blk_r;
int current_blk_l = digitalRead(BLK_L);
if (current_blk_l == 0 && current_blk_l != last_blk_l) //right blk button has come down since we last checked
{
delay(10);
if (digitalRead(BLK_L) == current_blk_l) {
modecycle();
}
}
last_blk_l = current_blk_l;
}
void modecycle() {
switch (mode) {
case STAND_BY:
mode = PRE_HEAT;
preheat();
break;
case PRE_HEAT:
mode = GET_BLAZED;
break;
case GET_BLAZED:
mode = COOL_DOWN;
cooldown();
break;
case COOL_DOWN:
mode = STAND_BY;
standby();
break;
}
modechangescreen();
}
void settemp() {
switch (mode) {
case STAND_BY:
heaterpwm = standbypwm;
break;
case PRE_HEAT:
setpoint = preheattemp;
break;
case GET_BLAZED:
setpoint = map(knobreading,0,1023,lowlimit,highlimit);
break;
case COOL_DOWN:
heaterpwm = cooldownpwm;
break;
}
}
void setfan() {
switch (mode) {
case STAND_BY:
fanpwm = fan_idle;
break;
case PRE_HEAT:
if (millis() - preheattime < 60000) {
fanpwm = fan_high;
}else if (millis() - preheattime > 110000){
fanpwm = fan_low;
} else {
fanpwm = 255 - ((millis() - preheattime - 60000) / 1000 ) ;
}
break;
case GET_BLAZED:
if (digitalRead(SW_LO) == 1) //right red button has come down since we last checked
{
fanpwm = fan_low;
}
else if (digitalRead(SW_HI) == 1) //right red button has come down since we last checked
{
fanpwm = fan_high;
}
else {
if (outtemp > 400) {
fanpwm = fan_high;
} else {
fanpwm = fan_low;
}
}
break;
case COOL_DOWN:
if (outtemp > 250) {
fanpwm = fan_high;
} else if (outtemp > 150) {
fanpwm = fan_low;
} else {
fanpwm = fan_idle;
}
break;
}
analogWrite(FAN, fanpwm);
}
void standby() {
yosPID.SetMode(MANUAL);
heaterpwm = standbypwm;
}
void preheat(){
yosPID.SetMode(AUTOMATIC);
yosPID.SetTunings(consKp, consKi, consKd);
setpoint = preheattemp;
preheattime = millis();
}
void getblazed(){
yosPID.SetMode(AUTOMATIC);
yosPID.SetTunings(aggKp, aggKi, aggKd);
}
void cooldown() {
yosPID.SetMode(MANUAL);
heaterpwm = cooldownpwm;
cooldowntime = millis();
}
void statuslog() {
unsigned long nowtime = millis() / 1000;
Serial.print(nowtime);
Serial.print(",");
switch (mode) {
case STAND_BY:
Serial.print("S");
break;
case PRE_HEAT:
Serial.print("P");
break;
case GET_BLAZED:
Serial.print("G");
break;
case COOL_DOWN:
Serial.print("C");
break;
}
Serial.print(",");
Serial.print(int(heaterpwm));
Serial.print(",");
Serial.print(int(currenttemp));
Serial.print(",");
Serial.print(int(setpoint));
Serial.print("\n");
if (Serial.available() > 0) {
inmode = Serial.read();
switch (inmode) {
case 'C':
mode = COOL_DOWN;
modecycle();
break;
case 'S':
mode = STAND_BY;
modecycle();
break;
case 'P':
mode = PRE_HEAT;
modecycle();
break;
case 'G':
mode = GET_BLAZED;
modecycle();
break;
}
}
}
Here is the sketch we have running to do basic temp sensor tests.
#include "Adafruit_MAX31855.h"
#include <LiquidCrystal.h>
int thermoCLK = A5;
int thermoCS = A4;
int thermoDO = A3;
Adafruit_MAX31855 thermocouple(thermoCLK, thermoCS, thermoDO);
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
double avg[10];
double outtemp;
double tempreading;
int dispcount = 0;
void setup() {
Serial.begin(9600);
lcd.begin(20, 2);
lcd.print("MAX31855 test");
delay(2000);
}
void loop() {
tempreading = thermocouple.readFarenheit();
outtemp = avg[0];
for (int i = 0; i < 8; i++)
{
outtemp += avg[i+1];
avg[i+1] = avg[i];
}
avg[0] = tempreading;
outtemp += avg[0];
outtemp *= 0.1;
lcd.setCursor(0, 0);
lcd.setCursor(0, 1);
lcd.print("F = ");
if (dispcount < 10)
{
dispcount++;
}
else
{
dispcount = 0;
lcd.setCursor(5, 1);
lcd.print(outtemp);
}
lcd.setCursor(13, 1);
lcd.print(avg[0]);
delay(100);
}
