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swapnil
Joined: 15 Dec 2016
Posts: 13
Location: delhi
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| no voltage display |
 Posted: Tue Jan 10, 2017 8:55 am |
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| Code: | #include <16F872.h> //equivalent with 10bit ADC
#device ADC=10
#fuses HS //Never use the 'Protect' fuse until you have completed
//your development. Doing so forces every cell in the chip to be erased
//every time you re-program - wastes chip lives. Otherwise the
//programmer will erase only the cells needed.
#use delay (clock=20MHz) // 20MHz
#define use_portb_lcd TRUE
#include <lcd.c>
#define CCP1_PWM PIN_C2
#define MAINS_SWITCH PIN_C3
#define CHARGING_LED PIN_C4
#define PCU_LOAD PIN_C5
#define LOAD PIN_C6
#define LOW_BATT_LED PIN_C7
#define MV_PER_COUNT (int16)(22.87/1024)
//We will do all the 'float' maths at compile time using this
//Not in the PIC itself
#define COUNTS_TO_MV(x) (x*MV_PER_COUNT)
#define TO_MV(x) ((int16)(x*1000))
int16 mean_adc(byte channel)
{
const int16 AVERAGING_CYCLE_COUNT=32;
int8 i;//mean_total = 32;
int32 total =0;
set_adc_channel(channel);
delay_us(100);
for (i=0; i<AVERAGING_CYCLE_COUNT; i++)
{
delay_us(10); //specified Tacq for your chip
total += read_adc();
}
return(total/AVERAGING_CYCLE_COUNT);
}
//Tacq (no more is needed), is required before sampling, and between
//each reading. More != better.
//********** Main Program*******
void main ( )
{
const byte SOLAR_CHANNEL=0;
const byte BATTERY_CHANNEL=1;
int16 battery_mv, solar_mv; //,bin,sin;
set_tris_c(0b00000111);
// setup_adc_ports(ALL_ANALOG);
setup_adc_ports(AN0_AN1_VSS_VREF); // Only ever configure pins you
//use as analog. Enabling others increases noise pickup on the ADC
//Also setting this to use A3 as the Vref input (2.5v).
setup_adc(adc_clock_div_32);
setup_ccp1(ccp_pwm); // Configure CCP1 as a PWM
setup_timer_2(T2_DIV_BY_1, 249, 1); // Set PWM frequency to 5kHz
//enable_interrupts(GLOBAL);
//Since you are not using interrupts don't enable this.
//Never enable 'GLOBAL', without at least one interrupt handler present
delay_ms(255); //Many LCD's need 250mSec+ to wake
lcd_init();
printf(lcd_putc,"\f WELCOME TO ");
printf(lcd_putc,"\n LUXNTEK SOLAR ");
delay_ms(50);
while(TRUE)
{
solar_mv=COUNTS_TO_MV(mean_adc(SOLAR_CHANNEL));
battery_mv=COUNTS_TO_MV(mean_adc(BATTERY_CHANNEL));
//Now just have the two readings in integer mV
printf(lcd_putc,"\fSOLAR =%4.1LwV",solar_mv/100);
//In 'C' the number in front of the DP is the 'total field width',
//not the digits here . To display 2 digits, DP, one digit, needs a
//field width of 4.
printf(lcd_putc,"\nBATTERY =%4.1LwV",battery_mv/100);
delay_ms(500);
if(solar_mv > battery_mv)
{ //solar > battery
if (battery_mv > TO_MV(2.0) && battery_mv <= TO_MV(14.5))
//This scares me. Do you really envisage any situation where
//battery_mv can be below 10v?. If so you have a dead battery....
{
setup_ccp1(CCP_pwm);
set_pwm1_duty(500);
output_high(CHARGING_LED);
delay_ms(200);
output_low(CHARGING_LED);
delay_ms(200);
printf(lcd_putc,"\fBATTERY CHARGING");
printf(lcd_putc,"\n BOOST MODE ");
delay_ms(400);
}
if(battery_mv > TO_MV(14.5))
{
setup_ccp1(CCP_pwm);
set_pwm1_duty(100);
delay_ms(100);
set_pwm1_duty(200);
output_high(CHARGING_LED);
delay_ms (600);
output_low(CHARGING_LED);
delay_ms(100);
printf(lcd_putc,"\fBATTERY CHARGING");
printf(lcd_putc,"\n TRICKLE MODE ");
delay_ms(500);
}
}
else
{ //solar<battery turn off
setup_ccp1(CCP_pwm);
output_high(CHARGING_LED);
delay_ms(300);
}
}
/////////////////////////////LOAD ////LED INDICATION ///////////////////////////////////////////////////////
//if dawn to dusk and load on batt
//actually sounds as if you mean dusk to dawn here (solar <5v)
if((solar_mv < TO_MV(5.0)) || (battery_mv > TO_MV(12.0)))
{
output_high(LOAD);
}
if(battery_mv <= TO_MV(11.0))
{
output_high(LOW_BATT_LED);
output_low(LOAD);
}
else
{
output_low(LOW_BATT_LED);
}
// Mains SNS PCU Load On
if((input(PIN_C3)==1) && (solar_mv > battery_mv) && (battery_mv > TO_MV(14.6)))
{
output_high(PCU_LOAD);
setup_ccp1(CCP_pwm);
set_pwm1_duty(500);
}
else if(battery_mv <= TO_MV(13.9))
{
output_low(PCU_LOAD);
}
} |
no display of voltage value on lcd
_________________
heroswap1981 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19559
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| Posted: Tue Jan 10, 2017 1:18 pm |
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Have you connected the Vref?.
Remember I said the code was to use an external 2.5v Vref. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jan 10, 2017 4:59 pm |
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This looks incredibly suspicious. You're making a small number, less
than 1, and then you're converting it to an integer. That will give you 0.
| Quote: | define MV_PER_COUNT (int16)(22.87/1024)
//We will do all the 'float' maths at compile time using this
//Not in the PIC itself
|
This means MV_PER_COUNT is 0. So the results of all the math below
are also 0.
| Quote: |
#define COUNTS_TO_MV(x) (x*MV_PER_COUNT)
#define TO_MV(x) ((int16)(x*1000)) |
In your earlier thread, Ttelmah told you:
| Quote: | So, learn to debug.
Print the number coming from the ADC with no processing at all. Is this right?.
Then work through things one stage at a time, checking the values, till you find where it goes wrong. |
But you didn't do that.
How did I verify there was a problem. First I was suspicious.
Then I added a little code to the start of your program and compiled it:
| Code: | void main ( )
{
const byte SOLAR_CHANNEL=0;
const byte BATTERY_CHANNEL=1;
int16 battery_mv, solar_mv; //,bin,sin;
//=====================
// *** TESTING ***
int16 temp;
// Load this constant so we can see it in the .LST file.
temp = MV_PER_COUNT;
while(TRUE);
//====================== |
Then I looked at the .LST file and saw that temp is being set to 0x0000:
| Quote: | .................... int16 temp;
....................
.................... // Load this constant so we can see it in the .LST file.
.................... temp = MV_PER_COUNT;
0311: BCF STATUS.RP0
0312: CLRF temp+1
0313: CLRF temp....................
.................... while(TRUE);
0314: GOTO 314 |
That means MV_PER_COUNT is 0x0000. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19559
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| Posted: Wed Jan 11, 2017 8:14 am |
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And you will see why if you think that the figure should be in mV.....
#define MV_PER_COUNT (int16)(22870/1024)
The pity is I was hoping to teach him how to debug. |
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