Jump to content

Recommended Posts

Posted

keypad

The keyboard also known as the keypad is fairly common use in programming the microcontroller to enter data quickly. Currently, there are different kinds keypad, but the most common are type 3 × 4 and 4 × 4.

 To identify an action occurs on the keypad, we implement continuous keypad scan to detect it.

 Compiler mikroC Pro for Pic has supported us a library of functions to perform a simple scan most keypad.

 Library in mikroC compiler function keypad (Keypad Library):

Keypad_Init (): Before you use the other functions of the library keypad, you must call this function before.
Keypad_Key_Press (): Read from the keyboard keys are pressed, if no key is pressed, the function returns 0.
Keypad_Key_Click (): The function will wait until the first key pressed and released. When the key is released, the function returns a value from 1 to 16, depending on the keys on the keypad. If more than one key is pressed, the function will wait until the key is released. Then, the function returns the value of the first key is pressed.

Video: https://www.youtube.com/watch?v=eOZ4e0jM-LQ

Code mikroC and proteus file here

  • 6 years later...
Posted
On 3/15/2016 at 2:37 AM, minhrung said:

http://www.dientudieukhien.net/wp-content/uploads/keypad-3x4.jpg

The keyboard also known as the keypad is fairly common use in programming the microcontroller to enter data quickly. Currently, there are different kinds keypad, but the most common are type 3 × 4 and 4 × 4.

 To identify an action occurs on the keypad, we implement continuous keypad scan to detect it.

 Compiler mikroC Pro for Pic has supported us a library of functions to perform a simple scan most keypad.

 Library in mikroC compiler function keypad (Keypad Library):

Keypad_Init (): Before you use the other functions of the library keypad, you must call this function before.
Keypad_Key_Press (): Read from the keyboard keys are pressed, if no key is pressed, the function returns 0.
Keypad_Key_Click (): The function will wait until the first key pressed and released. When the key is released, the function returns a value from 1 to 16, depending on the keys on the keypad. If more than one key is pressed, the function will wait until the key is released. Then, the function returns the value of the first key is pressed.

Video: https://www.youtube.com/watch?v=eOZ4e0jM-LQ

Code mikroC and proteus file here

Hopefully this is still helpful even after 6 year

thanks

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...