how to make a timer with 4 7-segment LED display

[SphinX]

pic18 ports registers

Hi,

Here is the code for HC595

Bye

 

[ME]

cd4021 serial bus

SPI Interface Big 7-Seg LED using cascaded 74595 serial-in-parallel out shift registers.
**broken link removed**

 

[ME]

how to expand outputs for pic

Analoge Balkenanzeige mit PIC (text in German language)
http://home.t-online.de/home/holger.klabunde/projects/bargraph.htm

 

[SphinX]

pic ports

Hi Me!

The last link use the cascade tech. "Many output as you like using 3 pins only" as msmax said.

I will write another code to use this tech
I will use PIC12C508 (as you know it have a 6 I/O pins only) with 74HC595 shift register.

I will make a special function to display 16 output using 3 pins only and 2 74HC595.

Thanx and Bye

 

[TAIT8000]

pic i2c expand

Hi!!!

I'm working too with a 74HC595 and a CD4021 and a HT9200A, all this devices are SPI and i want to control them.

i'm testing some code using the shift_left or _rigth, but when i do this i need call a timer each time and then write the next bit, shift_ command can write only one, but i'm thinking i must shift too the variable for the next bit i'm rigth?

Best regards.
Frank

 

[manu]

hc164 register lcd pic

Look AN234, from microchip :

https://ww1.microchip.com/downloads/en/AppNotes/00234a.pdf

Enjoy !

Manu

 

[Bingo600]

micorchip expanding ports

The HC595 code for "non" pic users

void HC595_OUT(unsigned char send_data)
{
   unsigned char bit_mask;

   for (bit_mask=1; bit_mask ;bit_mask <<=1)
   {
      // On an AVR you can set the bit directly and i'd use 
      // "data = (send_data & bit_mask);"
      
      //Else use this if/else ....
      if((send_data & bit_mask))
        output_high(data);
      else
        output_low(data);

      output_high(clock);
      delay_us(1);
      output_low(clock);
   }
   
   output_high(latch);
   delay_us(1);
   output_low(latch);
}

Ohh and btw: A HC164 is cheap also i use them , if i doesnt need the latch function
Well i use HCT's most , they my drive leds or LCD's

/Bingo

 

[gogo2520]

io port expand pic

Hi I am new to PIC programming and would like to see some code using a Pic and 74HC595 in asm I have programed in C++ befor but would like to learn asm first.
Thanks

 

[matelda]

picports

hi:
i think that you can use ppi 8255 it is good for power applications

 

[Weis Guy]

74hc595 and 4094 which is better

I have used 4 seven-segment using only 1 PIC..PIC16F84 have 8 pins for PORTB and 5 pins for PORTA therefore u can use portB for the 3 seven- segment in parallel and then control the COMMON with a traisistor as a switch in PORTA.well that my IDEA.. This is what they called STROBING.

GOOD LUCK!ü