Cooking Timer Project

Hello Im trying to make a cooking timer following the information
in this instructables site i have program the pic and power it up ever time
i do so i just get a blank screen on my lCD any help will be great Thank You.
I also did a flip the switch to test mode to test the lcd and it works just fine
im not sure what switch go what way i have try all the off and ons it showed me.
Thank you,

http://www.instructables.com/id/Cooking-Timer/

Code:

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'****************************************************************
'*  Name    : Time Countdown                                    *
'*  Author  : Arava                                            *
'*  Date    : 4/24/2007                                        *
'*  Version : 1.0                                              *
'*  Notes  : PIC16F819                                        *
'****************************************************************
'BUZZER CONNECTED TO PortB.4
'START BUTTON CONNECTED TO PortB.5
'RESET BUTTON CONNECTED TO PortB.0
'FOOD BUTTONS CONNECTED TO Ports B.1/ B.2 / B.3
'TIMER BUTTON CONNECTED TO PortA.2
'LCD CONNECTED TO PortB.6
'POTENTIOMETER CONNECTED TO PortA.0

OSCCON = %01100100    'set the internal oscillator to 4MHz
TRISA = %11111111    'make portA all input
ADCON1 = %10001110    'make portA.0 analog , all others Digital

output portB.6      ' output to lcd
OUTPUT portB.4      ' output to buzzer
input portB.5      ' input start button
input portB.0      ' input reset button
input portB.1      ' chicken button input
input portB.2      ' meat button input
input portB.3      ' egg button input

include "modedefs.bas"
DEFINE ADC_BITS 10          ' 10 bit adc conversion
DEFINE ADC_CLOCK 3          'These difine ADCIN parameters
DEFINE ADC_SAMPLEUS 20

'******************** variables***********************

counting var bit      ' 0=not counting. 1=counting in progress.
secCount var word    ' counting the seconds wile cooking
secLoop60 var word
secRemain var word  ' the time for the countdown
minRemain var word
TimeLoop var byte
cookingTime  var word  ' the time that takes for the food to cook

DeBounce con 10
start_buttonState var bit        'start button
reset_buttonState var bit
c_buttonstate var bit
m_buttonstate var bit
e_buttonstate var bit
timer_buttonstate var bit

weight var byte                  ' between 1-8 pounds

PotNoise con 2                    'potentiometer noise
PotSignal var word                  'potentiometer signal (0-1012)
PotSignala var word

LCD var PortB.6
BUZZER var PortB.4
chic_button var portB.1
meat_button var portB.2
egg_button var portB.3
start_button var portB.5
reset_button var portB.0
timer_button Var portA.2

'***************************setup*************************************
Setup:
    PAUSE 100
    serout2 LCD,396,[12]            'clear LCD screen
    pause 10
    serout2 LCD,396,[17]                  'turn on the LCD backlight
    pause 10
    serout2 LCD,396,["select food type"]  ' prints first instruction
    PAUSE 500                            ' wait for LCD to initiate
   
    counting = 0
    cookingTime  = 0
    secCount = 0
    secRemain = 0
    minRemain = 0
    TimeLoop = 0
    low BUZZER
Goto main

'***************************main*************************************
' if counting - keep counting.
' if not - feel for food buttons, if it's not pressed don't do anything.
' any other button pressed now - nothing happens

Main:
       
    if counting = 1 then      ' if cooking
        Goto Timer            ' keep counting
    endif

    c_buttonstate = chic_button  ' feelFoodButton - feel 4 buttons
    m_buttonstate = meat_button
    e_buttonstate = egg_button
    timer_buttonstate = timer_button

    if c_buttonstate = 1 then                      'if chick button changes ****
            pause 10                              'debounce time
            c_buttonstate = chic_button            'feel the button         
            if c_buttonstate = 1 then              'if the input is real
                    serout2 LCD,396,[12]          'clear LCD screen for countdown
                    pause 5
                    serout2 LCD,396,["chicken", 13, "weight:"]
                    pause 5
                    Goto CalculateChicken
            endif
    endif
       
    if m_buttonstate = 1 then                      'if meat button changes ****
            pause 10                              'debounce time
            m_buttonstate = meat_button            'feel the button         
            if m_buttonstate = 1 then              'if the input is real
                    serout2 LCD,396,[12]          'clear LCD screen for countdown
                    pause 5
                    serout2 LCD,396,["meat", 13, "weight:"]
                    pause 5
                    Goto CalculateMeat
            endif
    endif
   
    if e_buttonstate = 1 then                      'if egg button changes ****
            pause 10                              'debounce time
            e_buttonstate = egg_button            'feel the button         
            if e_buttonstate = 1 then              'if the input is real
                    serout2 LCD,396,[12]          'clear LCD screen for countdown
                    pause 5
                    serout2 LCD,396,["egg", 13, "level:  "]
                    pause 5
                    Goto CalculateEgg
            endif
    endif
   
    if timer_buttonstate = 1 then                  'if timer button changes ****
            pause 10                              'debounce time
            timer_buttonstate = timer_button      'feel the button         
            if timer_buttonstate = 1 then          'if the input is real
                    serout2 LCD,396,[12]          'clear LCD screen for countdown
                    pause 5
                    serout2 LCD,396,["timer"]
                    pause 5
                    Goto CalculateTimer
            endif
    endif

    gosub FeelResetButton
Goto main

'***************************CalculateTimer cooking time*************************************
CalculateTimer:
    'feel potentiometer + calculate var weight
    adcin 0,PotSignal                      'take two readings and compare them
    pause 10                                'with Noise as a measure
    adcin 0,PotSignala                      'a simple way to clean up your singnal
    if PotSignala < PotSignal - PotNoise then
        cookingTime = (PotSignala/4)*60
        serout2 LCD,396,[148,"Time: ", dec cookingTime /60 ,"min"]  'courser to second line pos 0 print weight.
    endif
    if PotSignala > PotSignal + PotNoise then
        cookingTime = (PotSignala/4)*60
        serout2 LCD,396,[148,"Time: ", dec cookingTime /60 ,"min"]
    endif
   
    '***special Feel Start Button timer time 
    start_buttonState =  start_button
    if start_buttonState = 1 then                      'if egg button changes ****
            pause 10                                  'debounce time
            start_buttonState = start_button          'feel the button         
            if start_buttonState = 1 then              'if the input is real
              pause 5
              serout2 LCD,396,[148, "Time          "]    'courser to line1 position 0
              pause 5
              counting = 1                    'change to counting state
              goto Timer                      'and start counting
            endif
    endif 

    gosub FeelResetButton   
   
Goto CalculateTimer

'***************************CalculateMeat cooking time*************************************
CalculateMeat:
    'feel potentiometer + calculate var weight
    adcin 0,PotSignal                      'take two readings and compare them
    pause 10                                'with Noise as a measure
    adcin 0,PotSignala                      'a simple way to clean up your singnal
    if PotSignala < PotSignal - PotNoise then
        weight = PotSignala/126
        serout2 LCD,396,[156, dec weight , "p  "]  'courser to second line pos 8 print weight.
    endif
    if PotSignala > PotSignal + PotNoise then
        weight = PotSignala/126
        serout2 LCD,396,[156, dec weight , "p  "]  'courser to second line pos 8 print weight.
    endif
       
    if weight < 2 then
        cookingTime = 35*60
    else
        cookingTime = (45+((weight-2)*10))*60
    endif             
   
    gosub FeelStartButton                        'go to FeelStartButton
    gosub FeelResetButton   
 
Goto CalculateMeat

'***************************CalculateChicken cooking time*************************************
CalculateChicken:
    'feel potentiometer + calculate var weight
    adcin 0,PotSignal                      'take two readings and compare them
    pause 10                                'with Noise as a measure
    adcin 0,PotSignala                      'a simple way to clean up your singnal
    if PotSignala < PotSignal - PotNoise then
        weight = PotSignala/126
        serout2 LCD,396,[156, dec weight , "p  "]  'courser to second line pos 8 print weight.
    endif
    if PotSignala > PotSignal + PotNoise then
        weight = PotSignala/126
        serout2 LCD,396,[156, dec weight , "p  "]  'courser to second line pos 8 print weight.
    endif
   
    if weight < 2 then
        cookingTime = 40*60
    else
        cookingTime = (60+((weight-2)*10))*60
    endif 
   
    gosub FeelStartButton                        'go to FeelStartButton
    gosub FeelResetButton   
 
Goto CalculateChicken

'***************************CalculateEgg cooking time*************************************
CalculateEgg:
    'feel potentiometer + calculate var weight
    adcin 0,PotSignal                      'take two readings and compare them
    pause 10                                'with Noise as a measure
    adcin 0,PotSignala                      'a simple way to clean up your singnal
    if PotSignala < PotSignal - PotNoise then
        weight = PotSignala/126
        if weight <=4 then
            serout2 LCD,396,[156, "soft"]  'courser to second line pos 8 print weight.
        else
            serout2 LCD,396,[156, "hard"]
        endif   
    endif
    if PotSignala > PotSignal + PotNoise then
        weight = PotSignala/126
        if weight <=4 then
            serout2 LCD,396,[156, "soft"]  'courser to second line pos 8 print weight.
        else
            serout2 LCD,396,[156, "hard"]
        endif
    endif
   
    if weight <=4 then
      cookingTime  = 5*60
    else
      cookingTime = 11*60
    endif

    'special FeelStartButton for egg state
    start_buttonState =  start_button
    if start_buttonState = 1 then                      'if egg button changes ****
            pause 10                                  'debounce time
            start_buttonState = start_button          'feel the button         
            if start_buttonState = 1 then              'if the input is real
              pause 5
              if weight <=4 then
                    serout2 LCD,396,[134, "soft"]  ' courser to line0 position 6
                else
                    serout2 LCD,396,[134, "hard"]
                endif
                serout2 LCD,396,[148, "Time          "]    'courser to line1 position 0
                pause 5
                counting = 1                    'change to counting state
                goto Timer                      'and start counting
            endif
    endif 

    gosub FeelResetButton   
   
Goto CalculateEgg

'***************************Feel Start Button*************************************   
FeelStartButton:
    start_buttonState =  start_button
    if start_buttonState = 1 then                      'if egg button changes ****
            pause 10                                  'debounce time
            start_buttonState = start_button          'feel the button         
            if start_buttonState = 1 then              'if the input is real
              pause 5
              serout2 LCD,396,[137, dec weight, "p  "] 'courser to line0 position 9
              serout2 LCD,396,[148, "Time          "]    'courser to line1 position 0
              pause 5
              counting = 1                    'change to counting state
              goto Timer                      'and start counting
            endif
    endif 
return

'***************************Feel Reset Button*************************************
 'feel reset button
FeelResetButton:
    'reset_buttonState =  reset_button
  ' if reset_buttonState = 1 then                      'if egg button changes ****
        '  pause 5                                  'debounce time
            reset_buttonState = reset_button          'feel the button         
            if reset_buttonState = 1 then              'if the input is real
              low BUZZER
            '  pause 5
              goto setup                      'and start counting
            endif
    'endif 
return
'**********************************timer******************************************** 
Timer:
    secLoop60 = 0
    while secLoop60 <= 59
        TimeLoop = 0
       
        while TimeLoop <= 99                'counts 100 times 
            TimeLoop = TimeLoop +1          ' 1 miliSec
            gosub FeelResetButton
            pause 10                 
        wend
 
        secCount = secCount +1                        ' add one sec to count
        secRemain = cookingTime - secCount            ' calculates the time remains to cook
        minRemain = secRemain/60
        if secLoop60 = 0 then
            serout2 LCD,396,[155,dec minRemain,":00"]
        else
            if  secLoop60 > 50 then
                serout2 LCD,396,[155,dec minRemain,":0", dec 60-secLoop60]
            else
                serout2 LCD,396,[155,dec minRemain,":", dec 60-secLoop60]
            endif
        endif
        secLoop60 = secLoop60 + 1
        if secCount = 900 then              ' after 15 min
            high buzzer                      ' buzz 5 sec
            pause 5000                     
            secCount = secCount - 5        ' reduce 5 sec from count
            low buzzer
        endif
        if secCount = cookingTime  then    ' if the food is ready
            while 1=1
                HIGH BUZZER                      ' make noise with BUZZER
                pause 5000
                low BUZZER
            wend
            counting = 0                    ' change counting to off
            goto Setup                      ' go back to start
        endif
    wend     
 
goto Timer

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Are you sure your LCD is a serial verion and not a standard parallel version ?

This code seems to use a serial LCD sending data on RB6. If you have a standard LCD it is expecting data on min 4 lines (when in 4-bit mode).

Code:

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;----[LCD definitions]------------------------------------------------------
DEFINE LCD_DREG  PORTB          ' LCD Data port
DEFINE LCD_DBIT  0              ' starting Data bit (0 or 4)
DEFINE LCD_EREG  PORTB          ' LCD Enable port
DEFINE LCD_EBIT  5              '    Enable bit  (on EasyPIC 5 LCD)
DEFINE LCD_RSREG PORTB          ' LCD Register Select port
DEFINE LCD_RSBIT 4              '    Register Select bit  (on EasyPIC 5 LCD)
DEFINE LCD_BITS  4              ' LCD bus size (4 or 8 bits)
DEFINE LCD_LINES 2              ' number of lines on LCD
DEFINE LCD_COMMANDUS 2000      ' Command delay time in us
DEFINE LCD_DATAUS 50            ' Data delay time in us

---

Thank you for replying back. This is the LCD that I have

http://www.parallax.com/Store/Access...0/Default.aspx

Try a baud mode number of 16780, I think this things are inverted.
SW1 = ON
SW2 = OFF

Quote:

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Originally Posted by mackrackit

Try a baud mode number of 16780, I think this things are inverted.
SW1 = ON
SW2 = OFF

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I will try that. And also this is my first time dealing with pics I have a question also about my set up does it need power to run to the pic? if so what leg its a pic16F819

Quote:

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Originally Posted by esmore

I will try that. And also this is my first time dealing with pics I have a question also about my set up does it need power to run to the pic? if so what leg its a pic16F819

---

Err yes you need to supply power to the PIC to run it !

5vdc required

Have a read of the data sheet http://oap.sourceforge.net/datasheets/PIC16F819.pdf

Quote:

---

Originally Posted by malc-c

Err yes you need to supply power to the PIC to run it !

5vdc required

Have a read of the data sheet http://oap.sourceforge.net/datasheets/PIC16F819.pdf

---

I look at the diagram pin 14 VDD is my 5volts so does that make pin 5 VSS the ground?

Thank you for the data sheet

Quote:

---

Originally Posted by esmore

I look at the diagram pin 14 VDD is my 5volts so does that make pin 5 VSS the ground?

Thank you for the data sheet

---

Yes - Vss should go to GND and Vdd to +5v Without these connections your PIC won't run !

Also look in the manual, section "2.4. It=s Alive".

This shows the basic/generic setup required. VDD, VSS, MCLR, OSC...

I was looking over my schematics

on the lcd display it says its only one wire and it hooks up to the
RB6/T1OSO/T1CKI/PGC pin is that right?


http://www.instructables.com/image/F...rd-Circuit.jpg

That's a crap schematic if you don't mind me saying so...

1) MCLR is left floating - should be pulled high via a resistor between 1K and 10K.
2) No supply lines to the PIC - as stated Vdd to +5 with Vss to GND
3) No decoupling capacitor - Place a 0.1uf Capacitor across the supply lines as close to the PIC as possible
4) IGNORE
5) IGNORE
6) No values for the pull down resistors - You need to state what value components are being used - again 1K - 10 K pull up / down resistors are the norm.
7)IGNORE

OK ignore some of those comments - I've juts worked out which way the tracks are running --- I'll wake up in a moment !!!


Can you also state where the 5v is coming from and have you measured it to make sure it is 5v and not 6v or 3v or 8v dc. If you are not sure then use a 7805 regulator to ensure the voltage is as close to 5v dc.

A big problem I see is the drawing only shows 16 pins on the MCU. the 16F819 has 18 pins at a minimum (PDIP). SSOP and QFN have a few more.

MCLR... Like Malc said, it needs to be pulled HIGH. Unless it is set as an input then it can be connected as a regular switch. Assuming the switch on the drawing labeled RESET goes to MCLR then it is good as an input but it will not work as a reset. Being it is not in the code as an input I will guess it is intended as a chip reset.

The LED can be connected as you have it if the configs have the OSC as internal. But we do not see the config settings.

Being this is your first project I will recommend doing the "Hello World" for MCUs. Make an LED blink. That way you will know how to set everything up. Then build on that. Every time I start a new project I will do a "BLINKY" just to be sure I have the chip working.

I suggest you read these
http://www.picbasic.co.uk/forum/cont...o-your-Program
http://www.picbasic.co.uk/forum/showthread.php?t=561

See if you can make an LED blink on PORTB.4 at ~1/2 second intervals. Then we can work on getting your project sorted out. But it will not be a copy/paste from the site you linked to.

As Dave has mentioned, the "blinky" LED test is really the starting point... I too use the same basic test to ensure the PIC is running and that the program has been uploaded to the PIC successfully. Once I know I have a working circuit I then move on a step at a time (connect a switch and see if it's function does what I intended for example).

16 Pin... How did I miss that - shows I was still half asleep :)

esmore, were you able to download the code from that site, compile it and upload it to the PIC ?

The only reason is that the link provided on that site "C:\MyDocuments\Parsons\Spring_07\PComp\code_final \cookingimer_final.txt" would point to a local folder on HIS computer !!!