Raspberry Pi Pico W LESSON 86: Up Down Binary Counter Using Interrupts and Pushbuttons

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In this class we will be using the Sunfounder Raspberry Pi Pico W Keppler Kit. It will make things a lot easier if we are working on identical hardware. the link below is to amazon, and is for the identical hardware I will be using in this entire class.

In this video, I will show you how to create a hardware interrupt on the Raspberry Pi Pico W in micropython. We will have two pins connected to pushbuttons, with interrupts connected to both pins. We will have 4 led, and will create a binary counter. One button increments the counter, while the second button decrements the counter. The counter buttons are debounced so it counts without error.

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#raspberrypipicow
#interrupts
#micropython

[craigflorin]

I enjoyed the lesson. Yes if folded up like a cheap Walmart lawn chair many times. Each failure was in itself a positive learning experience. Thank you!!!

[patrickfox-roberts]

👍 How amazing it all is from 1976 when I first learned compiled Basic and Simula as an undergrad and carried those bundles of punchcards to the computer centre for overnight batch runs. Wonderful stuff.

[edSabio]

Thanks Paul! both programs worked the same (mine very primitive) and decided to merge them to gain better understanding and appreciation on how to work more efficiently.

[louistoweill]

I am legend. I got the binary up and down counter working perfectly.

[edSabio]

Thanks Paul! My program worked but used the same globals on both functions for red and green buttons. I am comparing the functionality of both. If my chair folds, will fess up next lesson : ) Loved this lesson and look forward to next week.

[robertkarney]

Great tutorial!

In function driving LEDs how about:
- converting pass counter (cnt) to binary representation string (bin), and then
- set the each LED.value acording to each element/character of the bin array?

since I'm not able to set the model - I got the pass counter values from the loop
also instead of driving the LED I'm building the string (line) which will be printed to the console

for cnt in range(16):
bin = ('000' + "{0:b}".format(cnt))[-4:]

line = '[' + bin + ']'

for i in range(len(bin)):
line += ' | LED[' + str(2**(len(bin)-i-1)) + ']=' + bin[i]

print(line)

result:
[0000] | LED[8]=0 | LED[4]=0 | LED[2]=0 | LED[1]=0
[0001] | LED[8]=0 | LED[4]=0 | LED[2]=0 | LED[1]=1
[0010] | LED[8]=0 | LED[4]=0 | LED[2]=1 | LED[1]=0
[0011] | LED[8]=0 | LED[4]=0 | LED[2]=1 | LED[1]=1
[0100] | LED[8]=0 | LED[4]=1 | LED[2]=0 | LED[1]=0
[0101] | LED[8]=0 | LED[4]=1 | LED[2]=0 | LED[1]=1
[0110] | LED[8]=0 | LED[4]=1 | LED[2]=1 | LED[1]=0
[0111] | LED[8]=0 | LED[4]=1 | LED[2]=1 | LED[1]=1
[1000] | LED[8]=1 | LED[4]=0 | LED[2]=0 | LED[1]=0
[1001] | LED[8]=1 | LED[4]=0 | LED[2]=0 | LED[1]=1
[1010] | LED[8]=1 | LED[4]=0 | LED[2]=1 | LED[1]=0
[1011] | LED[8]=1 | LED[4]=0 | LED[2]=1 | LED[1]=1
[1100] | LED[8]=1 | LED[4]=1 | LED[2]=0 | LED[1]=0
[1101] | LED[8]=1 | LED[4]=1 | LED[2]=0 | LED[1]=1
[1110] | LED[8]=1 | LED[4]=1 | LED[2]=1 | LED[1]=0
[1111] | LED[8]=1 | LED[4]=1 | LED[2]=1 | LED[1]=1

also defining LEDs as array of LEDs, will allow to set their values, by index coresponding to character index in bit representation

I'm not a native English speaker, so I'm not only refreshing the basics of Micropython, but also improving my English.

Thank you...