ChipKIT UNO 32 Temp Center Kit

[SXRguyinMA]

I designed this for a customer and crenn did the code. It's open source, all files are available for you to make your own.

I've assembled and tested a unit and I've got 7 6 board sets left if anyone's interested in purchasing a set. I can ship bare boards, or I can assemble them for you with an LCD of your choice and cable length of your choice. PM me for details on that if you're interested.

Without further adieu, I introduce the ChipKIT UNO32 12-port temp center kit!

Shield Pics:

LCD Board Pics:

Code:

// ChipKIT UNO 32 12-port Temperature Center Shield
// Code Written by Crenn (www.thebestcasescenario.com)
// Designed by Will Lyon (www.computersandcircuits.com)

//  This program is free software: you can redistribute it and/or modify  
//  it under the terms of the GNU General Public License as published by  
//  the Free Software Foundation, either version 3 of the License, or  
//  (at your option) any later version.  
//  
//  This program is distributed in the hope that it will be useful,  
//  but WITHOUT ANY WARRANTY; without even the implied warranty of  
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the  
//  GNU General Public License for more details.  
//  
//  You should have received a copy of the GNU General Public License  
//  along with this program. If not, see http://www.gnu.org/licenses/  


// Libraries
#include <LiquidCrystal.h>

// Global Constants
const unsigned short START_MES_DIS_TIME=3;
const unsigned short ACTION_TIME=5;
const unsigned short UPDATE_TIME=1;
const unsigned short MILLIS_IN_SEC=1000;
const unsigned short SMDT_IN_MS=START_MES_DIS_TIME*MILLIS_IN_SEC;
const unsigned short AT_IN_MS=ACTION_TIME*MILLIS_IN_SEC;
const unsigned short UT_IN_MS=UPDATE_TIME*MILLIS_IN_SEC;
const byte TEMP_PINS=12;
const byte NO_TEMPS_ON_LCD=2;
const byte TEMP_SETS=TEMP_PINS/NO_TEMPS_ON_LCD;
const byte TEMP_PIN_MAP[NO_TEMPS_ON_LCD][TEMP_SETS]={
    {14,16,18,20,22,24} , {15,17,19,21,23,25}
};
const byte LCD_COLS=16;
const byte LCD_ROWS=2;
// The +1 is to allow for the null character at the end of the string
const char WELCOME_LA[LCD_COLS+1]="                ";                    // edit these to change the opening message display. Line 1 on top, line 2 on bottom
const char WELCOME_LB[LCD_COLS+1]="                ";
const char TEMP_L[]="TEMP ";
const byte TEMP_CUST_CHARS=7;
const byte TEMP_CUSTOM[TEMP_PINS][TEMP_CUST_CHARS+1]={
  
  {"TEMP  1"},{"TEMP  2"},{"TEMP  3"},{"TEMP  4"},                       // Change these to edit the temp zone display names. Max 8 characters each!
  {"TEMP  5"},{"TEMP  6"},{"TEMP  7"},{"TEMP  8"},                       // You will need to adjust the spacing and upload to get it where you want it
  {"TEMP  9"},{"TEMP 10"},{"TEMP 11"},{"TEMP 12"}
};
const char TEMP_S[]={0xDF,'C'};

// Global Variables
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
byte temp_pin_pointer=0;
unsigned short temp_values[NO_TEMPS_ON_LCD][TEMP_SETS];
byte temp_lcda=1;
byte temp_lcdb=2;
byte welc_disp=0;
unsigned long tsla; // time_since_last_action;
unsigned long tslu; // time_since_last_update;

double convertTemp(unsigned short ttbc) {
  if (ttbc > 237 && ttbc < 748) {
    return (ttbc-237)*0.0939947781;
  }
  return 0.0;  
}

// Temperature Sensor Functions
void newTemps() {
  temp_lcda=(TEMP_PIN_MAP[0][temp_pin_pointer]-13);
  temp_lcdb=(TEMP_PIN_MAP[1][temp_pin_pointer]-13);
}

void updateTemps() {
  for(byte i=0;i<TEMP_SETS;i++) {
    temp_values[0][i]=analogRead(TEMP_PIN_MAP[0][i]);
    temp_values[1][i]=analogRead(TEMP_PIN_MAP[1][i]);
  }
}

void displayTemps() {
  unsigned char spaces = 2;
  double temp_conv = 0.0;
  lcd.setCursor(0, 0);
  if(TEMP_CUSTOM[(temp_lcda-1)][0] != 0) {
    for (int i=0;i<TEMP_CUST_CHARS;i++) {
      if(TEMP_CUSTOM[(temp_lcda-1)][i] != 0) {
        lcd.print(TEMP_CUSTOM[(temp_lcda-1)][i]);
      }
	  else {
	    spaces = 8-i;
		break;
	  }
	}
  }
  else {
    lcd.print(TEMP_L);
    if(temp_lcda < 10) {
      lcd.print(' ');
    }
    lcd.print(temp_lcda,DEC);
	spaces = 2;
  }
  for (int i=0;i<spaces;i++) {
    lcd.print(' ');
  }
  if(TEMP_CUSTOM[(temp_lcdb-1)][0] != 0) {
    for (int i=0;i<TEMP_CUST_CHARS;i++) {
      if(TEMP_CUSTOM[(temp_lcdb-1)][i] != 0) {
        lcd.print(TEMP_CUSTOM[(temp_lcdb-1)][i]);
      }
      else {
        spaces = 8-i;
    	break;
      }
    }
  }
  else {
    lcd.print(TEMP_L);
    if(temp_lcdb < 10) {
      lcd.print(' ');
    }
    lcd.print(temp_lcdb,DEC);
    spaces = 0;
  }
  if (spaces != 0) {
    for (int i=0;i<spaces;i++) {
      lcd.print(' ');
    }
  }
  spaces = 3;
  lcd.setCursor(0, 1);
  temp_conv=convertTemp(temp_values[0][temp_pin_pointer]);
  if (temp_conv<10) {
    lcd.print(' ');
  }
  lcd.print(temp_conv,1);
  lcd.print(TEMP_S);
  for (int i=0;i<spaces;i++) {
    lcd.print(' ');
  }
  temp_conv=convertTemp(temp_values[1][temp_pin_pointer]);
  if (temp_conv<10) {
    lcd.print(' ');
  }
  lcd.print(temp_conv,1);
  lcd.print(TEMP_S);
}

void displayWel() {
  lcd.setCursor(0, 0);
  lcd.print(WELCOME_LA);
  lcd.setCursor(0, 1);
  lcd.print(WELCOME_LB);
}

void setup() {
  lcd.begin(LCD_COLS, LCD_ROWS);
  displayWel();
  tsla = millis();
  while (millis() < (tsla + SMDT_IN_MS));
  tsla = millis();
  updateTemps();
  displayTemps();
}

void loop() {
  if (millis() > (tsla + AT_IN_MS)) {
    if (welc_disp == 1) {
	  temp_pin_pointer = 0;
	  welc_disp = 0;
	  updateTemps();
	}
	else {
	  ++temp_pin_pointer;
	}
    if (temp_pin_pointer >= TEMP_SETS) {
	  displayWel();
	  welc_disp = 1;
    }
    else {
	  newTemps();
      displayTemps();
    }
    tsla = millis();
  }
  if (temp_pin_pointer < TEMP_SETS) {
    if (millis() > (tslu + UT_IN_MS)) {
      updateTemps();
      displayTemps();
      tslu = millis();
    }
  }
}

Eagle Files:

Shield Board:
.brd:
http://www.thebestcasescenario.com/s...Center_Brd.brd
.sch:
http://www.thebestcasescenario.com/s...Center_Brd.sch

LCD Board:
.brd:
http://www.thebestcasescenario.com/s...Center_LCD.brd
.sch:
http://www.thebestcasescenario.com/s...Center_LCD.sch

Bill Of Materials (.pdf):
http://www.thebestcasescenario.com/s...Center_BOM.pdf

[OvRiDe]

I totally want to see this in action! Any videos of it?

[SXRguyinMA]

I've got some. I'll get them uploaded soon

[SXRguyinMA]

On Hack-A-Day

http://hackaday.com/2011/11/02/chipk...dozen-sensors/

[crenn]

I'm apparently your associate according to the article ;P

Although one of the comments, made me think a little. Maybe there should be an offset for each channel if it's needed. Or I can fix up the maths involved in the temp as I knew it's not exactly accurate.

[SXRguyinMA]

it's not 100% accurate but 1ºC-2ºC off isn't bad.