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Arakel
Joined: 06 Aug 2016
Posts: 107
Location: Moscow
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| Temperature sensor and display with PIC16F690 |
 Posted: Sat Dec 03, 2016 5:42 am |
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I thank to: Ttelmah, temtronic !
The program starts a heater(LED) if the value of a potentiometer is higher than the value of a sensor. It shows from -20 to 50 degrees Centigrade temperature on a 7segment display. If the temperature is in minus degrees a second "Minus_LED" is started to indicate that the display shows minus degrees.
Theoretically it can show from -50 to 59 but I do not think the electronics will survive!
| Code: | //A program to scan the values of an ADC and potentiometer and start a heater if they are different with the debouncing routine
//The difference is that the minus degrees on the display are with a different coding realization
#include <16F690.h>
#device ADC=10
#fuses NOMCLR, NOWDT, NOPROTECT, INTRC_IO
#use delay(clock=4M)
#define Minus_LED PIN_B5
void main()
{
/**********Initiasization*************/
int i,z; //Local variables
unsigned int16 ADC_10bit_Sensor;
unsigned int16 ADC_10bit_Potentiometer;
unsigned int16 OutputDigit; //This digit is only used to be put inside FinalFormOfThePORTCOutput so we know which element number of the array to use
unsigned int8 FinalFormOfThePORTCOutput[80] =
{
0b00000000, // 0
0b00000001,
0b00000010,
0b00000011,
0b00000100,
0b00000101,
0b00000110,
0b00000111,
0b00001000,
0b00001001,
0b00010000, // 10
0b00010001,
0b00010010,
0b00010011,
0b00010100,
0b00010101,
0b00010110,
0b00010111,
0b00011000,
0b00011001,
0b00100000, // 20
0b00100001,
0b00100010,
0b00100011,
0b00100100,
0b00100101,
0b00100110,
0b00100111,
0b00101000,
0b00101001,
0b00110000, // 30
0b00110001,
0b00110010,
0b00110011,
0b00110100,
0b00110101,
0b00110110,
0b00110111,
0b00111000,
0b00111001,
0b01000000, // 40
0b01000001,
0b01000010,
0b01000011,
0b01000100,
0b01000101,
0b01000110,
0b01000111,
0b01001000,
0b01001001,
0b01010000, // 50
0b01010001,
0b01010010,
0b01010011,
0b01010100,
0b01010101,
0b01010110,
0b01010111,
0b01011000,
0b01011001,
};
setup_comparator(NC_NC_NC_NC); //We disable the comparators so we can use the PINs
setup_adc_ports( sAN0 | sAN1 ); //Adc functions
setup_adc( ADC_CLOCK_DIV_16 );
while(TRUE)
{
/**********We set and read from the ADC channels, meaning from the potentiometer and sensor*************/
set_adc_channel( 0 ); //We set the ADC to read from CHANNEL 0 (Where the potentiometer is connected)
for(i=0; i<15; i++)
{
delay_ms(1); //The ADC is 10 bit so we have "2 to Grade 10" values, meaning 1024
ADC_10bit_Potentiometer = read_adc(); //So for 5 volts we have: 5/1024 = 0.0048828125 Volts per ADC tick!
if(ADC_10bit_Potentiometer != ADC_10bit_Potentiometer)// Meaning that for an ADC value of 600 we have: 600 x 0.0048828125 Volts
i=0;
}
set_adc_channel( 1 ); //We set the ADC to read from CHANNEL 1 (Where the sensor is connected)
for (i=0; i<15; i++)
{
delay_ms(1);
ADC_10bit_Sensor = read_adc();
if (ADC_10bit_Sensor != ADC_10bit_Sensor)
i=0;
}
if (ADC_10bit_Sensor <= ADC_10bit_Potentiometer) //If the sensor is lower than the potentiometer turn ON the heater
{
delay_ms(1);
output_b(0b00010000);
} else { //If the sensor is higher than the potentiometer turn OFF the heater
output_b(0b00000000);
}
{
if (ADC_10bit_Sensor >= 578) //578 from the ADC equals zero degrees("2.82276"Volts). This "if statement" is only for the positive degrees plus the zero
{
OutputDigit = ((ADC_10bit_Sensor*0.0048828125) - 2.82276)/ 0.01163;
output_c(FinalFormOfThePORTCOutput[OutputDigit]);
}
}
if (ADC_10bit_Sensor < 578) //This "if statement" is only for the negative degrees(under "2.82276"Volts)
{ //When we get a positive result we use the same "FinalFormOfThePORTCOutput" table but we start a LED( "Minus_LED") to indicate its minus degrees
OutputDigit = ((ADC_10bit_Sensor*0.0048828125) - 2.82276)/ (-0.01163); //We divide by "-0.01163" in order to get a positive result because "minus/minus = plus"
output_c(FinalFormOfThePORTCOutput[OutputDigit]);
delay_ms(1);
output_high(Minus_LED); //If the ADC for the Sensor is under 578 we have minus degrees so we output "high" the "Minus_LED".
delay_ms(1);
}
}//Close while
} |
_________________
Yo! I love learning and technology! I just do not have experience so do not be angry if I ask a stupid question about a detail! From so much to remember sometimes I forget the details in order to remember the big problems! |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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| Posted: Mon Dec 05, 2016 5:14 pm |
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why or why are you using those floats with a
10 bit integer ADC reading ??
you are losing vast numbers of cpu cycles
and code space to the floating point math .
OMG what a slow poke program |
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Arakel
Joined: 06 Aug 2016
Posts: 107
Location: Moscow
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| Posted: Mon Dec 05, 2016 5:19 pm |
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It works perfect! Plus I need the float math in order to do the accuracy so I can get 1 degree difference!
I do not have float variables only constants, it should not be a problem for the coding and the processor is fast enough.
If you can give me another way to make the accuracy, I am listening?
After all I am learning here and miracles will not happen with the first program. After 20 years I might be able to do it perfect but not yet!
I welcome all critiques! The more I learn the better!
_________________
Yo! I love learning and technology! I just do not have experience so do not be angry if I ask a stupid question about a detail! From so much to remember sometimes I forget the details in order to remember the big problems! |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Wed Dec 07, 2016 6:13 am |
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| Quote: | | It works perfect! Plus I need the float math in order to do the accuracy so I can get 1 degree difference! |
35.56 float vs. 3556 int.
Ask yourself: What is the accuracy diference?
G.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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