This module offers on a small hole grid erection
8 LED's to display the state of each I/O line of a port. The LED's
are connected with the anodes (+) over resistors to +5Volt and with
the cathode (-) directly to the port pins. The LED's light up at low-levels
of the port pins (inverse display: 0=on, 1= off). This has been chosen
due to the fact that the outputs of the MC's can deliver about 15mA
at a low-level and also most other digital circuits deliver most of
the times a lot more power at low-level.
If you use low current LED's in this module you can use 1.5kOhm resistors.
The port outputs will have to supply about 2 mA. If you use regular
LED's you should use 220 Ohm resistors. The port outputs will be burdened
with about 14 mA which is already close to the limit.
There have been soldering pins (P0-P7) inserted
at the port I/O pins of the module. At these soldering pins you can
connect other consumers or sources if necessary. If you connect a
soldering pin to a source like i.e. the output line of a digital gate,
you should make sure that this corresponding port pin of the microcontrollers
gets set on a high-level through the progam (in order to prevent that
the MC with his relative strong low-signal does not drive against
an eventual existing high-signal of the digital gate) and additionally
you should consider that the digital gate in case of a low-signal
at its output line not only has to pull its internal pullup-resistor
to low but also has to supply the LED with energy.
Data:
| Suitable for Experimenting
Board: |
I and II |
| Attachable to extension port: |
Can be attached to any port |
| Adjustments at DIP-switch:
|
No special adjustments necessary.
XTAL 1 and XTAL 2 should be "ON" so the MC gets a tact signal. |
| Power consumption: |
Depending on the level at the port
pins and the used LED's. With low current LED's 0 to 16mA total, the 5
Volt line of the Experimenting Board gets burdened. |
| Circuit board / Layout: |
Very simple layout. Optimized for
set up on hole grid erection without bridges. |
| Limitations: |
At port 3 of the 20 Pin Flash MC's
there is no port line 6. This of course is why D6 can't be triggered on
that port. |
Schematic, component placement and solder layer:
 |
Component placement, bird's
view on top layer:
Solder layer, bird's
view on bottom layer:
Optimized for set up
on hole grid erection. The points display
the grid of 0.100" (=2.54 mm). |
Links related to this page:
.
General...
. 8
digit 7 segment display module...
.
Relay module...
. RAM
module...
. RS
232 module...
Links related to this and other pages:
.
Flash Microcontroller Experimenting Board
I...
. Flash Microcontroller Experimenting
Board II...
. Flash Microcontroller Programmer I...
. Flash Microcontroller Programmer II...
. Prog-Studio 6
software...
| • Copyright 1999 - 2007 by Batronix Elektronik
• |
|
