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| Table: Pin outs from PHILIPS DATASHEET |
This post continues my search of finding the lowest o/p number to be connected to my UNO. Alhamdulillah, I have found a solution that only requires 3 pins connected to my UNO, and it is:
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| 74HC595 Shift Register (Figure: Courtsey of Open Source Notes) |
Actually the schematic above is from Arduino notebook and it is connected to 8 LEDs. But for my project, I will use the 7 segment to display the number of patient's bed. The 7-segment LED pins are:
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*Compare these to the real datasheet pins because there is a website telling that a datasheet was wrong. Maybe I'll make 2X7 Segment because it is ridiculous not to be able to display 2 digits in a monitoring system. However, it will double the connection to 6 o/p pins. So it's a challenge for the Number of Bed display part. I'll check back on it later.
The conclusion is, the 74HC595 have 3 inputs to be connected to my UNO, that are:
- DS (pin 14) to Ardunio DigitalPin 13
- SH_CP (pin 11) to to Ardunio DigitalPin 4
- ST_CP (pin 12) to Ardunio DigitalPin 2
The remaining pins that I haven't connect are:
AREF, 0-RX, 1-TX, 3, AND 5.
Alright!!! Time to sketch the outputs! I must jot these all down in the log book because I will refer and use this a 1000 times :)
Have u connect the 7 segment LED to the 74HC595? How is it going to display the decimal output? I have tried it with my 7 segment but the outputs are just the blinking 7 segment not specifically display any numbers. I've try to work this out I think there is a problem with my sketch. If u could help me out that would be cool.
ReplyDeleteOpps!sorry azmin8 I havent try any hardware conncetion yet since my UNO didn't get here until next monday.yeah it's a lil bit frustrating but i'll get back to u if i have done the sketch and hardware.
ReplyDeleteOkay. Try check the 7 segment with triple display on it. It's all together in the single chip. I never tried it before, but I think it'll be the same.
ReplyDeletehye there azmin8 i haven't found the 7 segment that you've mentioned.yeah i'm running a little late because of many things i haven't done, but i've sent u my sketches for the shift register. try uploading it at your arduino. see if it works. :)
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