I'm trying to multiplex three 7 segment LED displays to provide a counting feature. On a side note, please don't mention using display drivers for driving the displays because a.) I want to keep the parts to a minimum, and b.) I already am able to get the PICAXE to display a static value simply using the outputs as GND and Port C pins as the common anode.
Sample code which demonstrates multiplexing LED displays on a PICAXE is very elusive. I see posts in this forum saying to search for the code because it's well documented, which I did, only to find nothing that clues me to what I want to know.
I managed to come across this code to attempt to make a single digit count from 0 to 9. It is excerpted from code written by a Daniel Wright. I'm using a PICAXE 28x1
A couple notes first:
After programming the PICAXE, I get a "0" in my LED Display. It pauses for a little over one second, then the display blanks out, never to reappear again until I reset the device.
Thinking the zero in the display was a fluke, I transposed the first two values in the DATA statement so that a "1" will appear for a second. A "1" did appear for a little over a second and then the display blanked out as usual, never to show anything again.
What gives?
I don't have a schematic to show, but I wired the LED segments (a-g) to pins 21-27 (0-6 of the Output pins) in the proper order to match the bits in the DATA statement.
The common anode for just a single digit right now is connected to Pin 11 (Input/Output 0). Therefore, when I set all Port C pins to Output and set to High, the LED digit should have it's common anode set to +5V as required.
My guess is the for loop runs through only the first pass (doesn't even count to "1") and then the program quits.
Sample code which demonstrates multiplexing LED displays on a PICAXE is very elusive. I see posts in this forum saying to search for the code because it's well documented, which I did, only to find nothing that clues me to what I want to know.
I managed to come across this code to attempt to make a single digit count from 0 to 9. It is excerpted from code written by a Daniel Wright. I'm using a PICAXE 28x1
Code:
Initialize:
data 0,(%00111111,%00000110,%01011011,%01001111,%01100110,%01101101,%01111101,%00000111,%01111111,%01101111) ‘ save array 1 values in EEPROM
let dirsc=%11111111
main:
for b0 = 0 to 9 ‘start ones loop
read b0,b1 ‘read ones value of array 1
let pinsc = %11111111
let pins= not b1
pause 1000
;let pins = %00000000
next b0 ‘next character ones loop
goto main
end- This is slightly modified code from the original
- I'm using Common Anode LED Displays
- the "not b1" term in the code is used because of the Common Anode LEDs
After programming the PICAXE, I get a "0" in my LED Display. It pauses for a little over one second, then the display blanks out, never to reappear again until I reset the device.
Thinking the zero in the display was a fluke, I transposed the first two values in the DATA statement so that a "1" will appear for a second. A "1" did appear for a little over a second and then the display blanked out as usual, never to show anything again.
What gives?
I don't have a schematic to show, but I wired the LED segments (a-g) to pins 21-27 (0-6 of the Output pins) in the proper order to match the bits in the DATA statement.
The common anode for just a single digit right now is connected to Pin 11 (Input/Output 0). Therefore, when I set all Port C pins to Output and set to High, the LED digit should have it's common anode set to +5V as required.
My guess is the for loop runs through only the first pass (doesn't even count to "1") and then the program quits.