Scrolling thermo

[BobEdge]

Hi,

Just ran a simulation in isis. First thing I notice is that porta.4 does not seem to be working. Don't know if that is just the simulator though.

Will take a closer look at your code

[pedja089]

Maybe pull up resistor is missing?

[gadelhas]

Hi;

In PIC16F628A the RA4 Pin is open drain, so you wll need a pull up resistor.

[fratello]

Working soft in simulation !!!

[fratello]

Mr.Arrati say : " PortA.4 is a Schmitt Trigger input and an open drain output. You will need an additional NPN transistor with a pull down resistor to make column 5 working.". So... can I use PortA.5 instead PortA.4 ? How ? Using "MCLR off" and ?!

[gadelhas]

Mr.Arrati say : " PortA.4 is a Schmitt Trigger input and an open drain output. You will need an additional NPN transistor with a pull down resistor to make column 5 working.". So... can I use PortA.5 instead PortA.4 ? How ? Using "MCLR off" and ?!

You can only use RA5 as Input with MCLR off

[fratello]

This is schematic who work fine in Proteus. In "real life" , despite modification of scroll timming (pause 500 to 5000 !), the led's are always ON !!! Any idea ?
Thanks !

[gadelhas]

Hi;

I cannot compile that source code. What is the "LOOP" for?? This is a reserved word, you cannot compile the code with this word on a label. And i'm always getting illegal opcode.

What are you using to compile? Mpasm? or PBP?

[mister_e]

This is schematic who work fine in Proteus. In "real life" , despite modification of scroll timming (pause 500 to 5000 !), the led's are always ON !!! Any idea ?
Thanks !

Are they FULL ON or dimmed? I feel they will be dimmed, it's a kind of ghost probably you'll need to add some delay after you turn them off, after the PORTB=0 line

Turn some LED ON, wait a little bit, turn them OFF, wait a little, do it again.