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| Index: Circuits & Layouts: Extension modules: 8 digit 7 segment display module... |
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With this module and a MAX7219 you can work with up to eight 7 segment displays. The activation is taking place serial through three lines (Px.4 = Clk, Px.6 = Load, Px.8 = Data In). Another output line (Px.2 = Data Out) enables an optional extension by another module. The four port pins Px.4 to Px.7 are not needed for activation and have been connected to soldering pins for other possible uses. Nearby 7 segment displays you usually find keys and switches that can be attached here to these vacant soldering pins. For these keys and switches there are to soldering pins with +5V and GND available.
The Max7219 offers a couple of nice functions: It can i.e. regulate the brightness of the display in 16 steps per software and it isn't bound to only displaying pure numbers through it's integrated BCD to 7 segment decoder. It can be used any possible combination of the segments and you can i.e. also display some letters or 'graphical effects' (this features uses the example program 2 which displays a scrolling font).
Auf course you can use less displays, but the minimum in this setup is 4 pieces (See datasheet of the MAX7219 for further information).
Another tip to the setup: Instead of the 7 segment displays you can solder in two 40 pole wide IC sockets. The 7 segment displays can be plugged into the socket. This way you can easily remove them, exchange them if they are broken or change the number of displays depending on the application.
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Download
schematic and layout (packed Eagle files, 20 KBytes) |
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Description
in PDF format (.pdf file, 31 KBytes, currently only available in German) |
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Example
program 1 (Display numbers) (.asm file for Batronix Prog-Studio 6 software, 6 KBytes) |
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Example
program 2 (Display scrolling font) (.asm file for Batronix Prog-Studio 6 software, 8 KBytes) |
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Example
program 3 (Display time) (.asm file for Batronix Prog-Studio 6 software, 8 KBytes) |
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Datasheet
of the MAX7219 (packed file, 187 KBytes) |
To download right-click the link and select "Save target as..." or "Save link as...". Otherwise your browser might display the PDF file directly in the browser window.
| Developed from: | Rainer Rick <IB_Rick@yahoo.de> |
| 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 number of triggered segments, the adjusted brightness and the used 7-segment displays this module can use up to to 300mA... |
| Circuit board / Layout: | Relative simple layout. Dobble sided or single sided (with bridges) etched circuit board. |
| Limitations: | None |
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General...
. Simple
display module...
.
Relay module...
. RAM
module...
. RS
232 module...
.
Flash Microcontroller Experimenting Board
I...
. Flash Microcontroller Experimenting
Board II...
. Flash Microcontroller Programmer I...
. Flash Microcontroller Programmer II...
. Prog-Studio 6
software...
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