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ii have big problem with dry film
i buy from china negative dry film.
i use soduim carbonate to developing dry film . after developing i see the copper good
when i put pcb in ferric chloride to etching it. the some pcb area is not etching because there are an Transparent layer protect copper...
i use mikroc compilier
when i use timer interrupt . when is there timer over flow the timer interrupt function is work.
but when avr cpu is return from interrupt function it's not return to the last programm adress(when intterupt is done)
but it start from beganing from the main code and...
pcb DRY fILM problem
i buy from china negative dry film.
i use soduim carbonate to developing dry film . after developing i see the copper
when i put pcb in ferric chloride to etching it. the pcb is not etching because there are an Transparent layer of dry dry film " i use a correct layer...
**broken link removed**
i use this circuit but without diode and i use 4mhz crystal.
when i remove 4mhz crystal from my circuit the pic16f877a is work but slow" see post 1# " . it's means pic16f877a clocked by internal osc.
#7
i set clock in mikroc at 4mhz.
#8
yes delay_ms is software generated delay.
#9
post code in post 5# , i use simple circuit pic + reser resistor + crystal and 2 cap i try 22p and 15p and no capictor and problem still
#10
i try 3crystal and problem is still...
mikroc pro 4.6
chip pic16f877a
crystal 4mhz xt
void main() {
TRISD=0x00; // TRISD OUTPUT
while(1){
portd=1;
delay_ms(500);
portd=0;
delay_ms(500); }
}
work in simulation . but in my real circuit delay is 10 sec no .5sec
i use xt 4mhz crystal and i try long time and no solution.
the problem is. i make simple loop. on and off an led with 500ms delay . it work in simulation .
but in my circuit it's take about 10sec to flashing led. :?:
avr usb avr programmer
i build avr usb programmer .
but i have problem i have 6 usb port in my pc . my programmer work only with 2 port. and when i connect it with other 4 port give me this "device not recognized"
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