Hi again.
In this project, i have cerated an industrial scales. It is managed by a pic18f4550 and its main features are:
- It is able to weigh until 5100Kg
- It sends the weight in to a serial rs232.
- It displays the weight on a two lines lcd.
This project uses the Lcm324 gauge. It works with 2mV/V step, for this reason, i have to use the LM324 integrated in order to amplify the low signal that comes from the gauge.
The varaiable resistor emule the gauge´s signal from 0v to 0.02V
The complete code is:
#include <18f4550.h>
#device adc=10
#FUSES XT, NOWDT
#use delay(clock=4000000)
#include
#use rs232(baud=9600, xmit=pin_c6, rcv=pin_c7, bits=8, parity=N)
float v,p;
#int_AD
void serial_isr()
{
printf("Peso= %04.2fKg",p);
delay_ms(500);
}
void main()
{
int16 t;
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL);
lcd_init();
enable_interrupts(global);
enable_interrupts(int_AD);
while (true)
{
set_adc_channel(0);
delay_us(20);
t=read_adc();
v=(5.0*t)/1024.0;
p=((v*5100)/2)-410.88;
printf(lcd_putc,"\fPeso= %04.2fkg",p);
delay_ms(500);
}
}