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Topic: Serial -> 7 - Segment display (Read 1 time) previous topic - next topic

Flub

Hey there,
I try to control 4 7 segment displays with two of these registers http://www.alldatasheet.com/datasheet-pdf/pdf/51041/FAIRCHILD/DM74LS164N.html

I connected the reset pins, the clock pins, and on both of them I connected serial in 1 and 2 .
the serial in inputs of the second one are connected with the last output (OH) of the first register.

Now I cannot figure out how to send serial data to it from the arduino.
Which is the clock pin, which is the serial out pin, how can I access them?



I really dont know how i can get this work  :~

- Flo

Grumpy_Mike

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Which is the clock pin, which is the serial out pin, how can I access them?


Any pin you want them to be, it is down to your software.

See :- http://www.arduino.cc/en/Tutorial/ShiftOut

Note that for four 7 Segment displays you will need four shift registers not two.

Flub

i got it to work now.

it was just a the and gate input of the registers.
I need two 8 bit registers, or four 4bit ...

it works now

Grumpy_Mike

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it was just a the and gate input of the registers.

Not sure that make any sense.

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I need two 8 bit registers, or four 4bit

? a seven segment display has seven segment hence you need seven outputs. Unless of course you don't actually have a seven segment display but a decoder chip driving the seven segment display, which is something different from what you said.

Flub

#4
Apr 12, 2011, 01:04 pm Last Edit: Apr 12, 2011, 01:45 pm by Flub Reason: 1
yeah sorry,  i meant that there is  an AND gate at the inputs of my serial in parallel out shift registers.

and yeah i meant driving the drivers...

i was just so happy that it finally worked ...

- Flo

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