11-09-2015 08:36 AM - edited 11-09-2015 08:37 AM
Hello, I'm a student of renewable energy engineering and I have a problem with a circuit I've made. This circuit consists on a 0-9 keypad connected to a 74HC147, which is connected to a 4511BD, which is then connect to a seven-segment red display, with a common cathode.
The problem is that it doesn't matter which button of the keypad I press, the display always shows a six.
I've ran out of ideas and I don't know why it doesn't work as it should.
I would be very thankful if someone could help me out, I'll leave the ms11 file here. Thank you.
Solved! Go to Solution.
11-13-2015 12:16 PM
hello, I have it checked.
a few things -
what is the purpose of s1?
why do you use NC buttons instead of NO?
what is the purpose of that module?
why do you use priority encoder?
as it is it works OK - just check data sheet of 74147 and look at true table.
good luck
Michael
11-14-2015 06:26 AM