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I am trying to get result from adc pin 12F675

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swapnil

Joined: 15 Dec 2016
Posts: 13
Location: delhi

I am trying to get result from adc pin 12F675

Posted: Sat Aug 21, 2021 3:24 am

Code:

#include <12f675.h>
#device adc=10
#fuses INTRC_IO, NOWDT, PUT, BROWNOUT, MCLR
#use delay(clock=4000000)

#define RELAY PIN_A3 // Relay for 110 v switch
#define LED PIN_A5 // TRANSISTOR for chg cut for nicd battery

void main()
{
int16 adc_value;
float batt_volt;
float mns_volt;

set_tris_a(0b0000111);
setup_adc(ADC_CLOCK_DIV_32);
setup_adc_ports(sAN0|sAN1|sAN2);
delay_ms(100);
while(TRUE)
{
set_adc_channel(0);// Battery Voltage Sense
set_adc_channel(2);// mains Voltage Sense
adc_value=read_adc();
batt_volt=adc_value/20.449;
mns_volt=adc_value/20.449;
//batt_volt=adc_value*(5/1023);//20.449;
if (batt_volt >= 13.8 )//<=14.0)// && batt_volt <= 1.0 )
{
delay_ms(3000);
output_high(LED);
}
if (mns_volt <= 1.0 )//<=3.0)
{
delay_ms(3000);
output_high(RELAY);
}
else
{
output_low(RELAY);
delay_ms(3000);
output_low(LED);

}
}
}

_________________
heroswap1981

Ttelmah

Joined: 11 Mar 2010
Posts: 19587

Posted: Sat Aug 21, 2021 3:31 am

You have to work like this:

Code:

set_adc_channel(0);// Battery Voltage Sense
delay_us(10); //The channel has to be selected long enough
//for the signal to acquire -> Tacq. Check the data sheet for what this
//needs to be (9.55uSec min on your chip).
adc_value=read_adc(); //This now reads the battery voltage

set_adc_channel(2);// mains Voltage Sense
delay_us(10);
adc_value=read_adc(); //This now reads the main voltage sense.

Sequence is always select channel, wait for signal to acquire, then sample
this.

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