Wiring and Setup with MicroPython

7 phase show could be managed with a number of Micropython traces from Raspberry PI Pico. It's one in all easiest initiatives and a humorous technique to begin coding and cabling

7 digit display

On this tutorial, I’m going t present you join and configure a 7 phase show with a Raspberry PI Pico. If you're all for get it working with Raspberry PI pc boards (like RPI Zero, RPI 4 mannequin B, RPI 3 mannequin A/B, and so forth), please seek advice from my Control a 7 Segment Display from Raspberry PI with Python.

7 phase show is used inside a large variety of functions, often to single a show quantity. These gadgets have easy inside wiring diagrams, which maps one after the other LEDs to its pins:

7 digit display pin

Please observe that this tutorial makes use of a typical cathode 7 phase show. Which means the widespread pins (3 and eight) go to the bottom and every led phase is turned on when a constructive worth comes from RPI Pico. With widespread anode, the widespread Pind go to three,3V and every led phase is turned on when a unfavorable worth comes from RPI Pico. Within the second case, in comparison with my tutorial you'll have to change 3 and eight pins wiring them to Raspberry PI Pico bodily pin 36 (3v3 OUT) and invert my code logic.

What We Want

As ordinary, I counsel including from now to your favourite e-commerce purchasing cart all wanted {hardware}, in order that on the finish it is possible for you to to judge general prices and resolve if proceed with the undertaking or take away them from the purchasing cart. So, {hardware} will likely be solely:

raspberry pi pico microcontroller

Lots of the listed {hardware} (besides Raspberry PI Pico) could be purchased alone or could be additionally discovered within the helpful Elegoo starter kit.

Test {hardware} costs with the next hyperlinks:

Amazon raspberry pi boards box
amazon raspberry pi pico box
Amazon Resistors box
Amazon Breadboard box
Amazon Dupont Wiring box

Step-by-Step Process

Wiring Diagram

Put together cabling in accordance with the next wiring diagram. Relating to Raspberry PI Pico pinout, you possibly can refer my information displaying it: Raspberry PI Pico pinout

Raspberry PI Pico 7 segment display wiring diagram

This wiring produces the next mapping between Show and Raspberry PI:

Show SectionShow PinRaspberry PI Pico GP pin
A717
B616
C414
D213
E112
F918
G1019
DP515
GRD3GND
GRD8GND

So, every Raspberry PI Pico pin powers a selected Led phase. Powering collectively an outlined sequence of segments will show the quantity we need to present.

Please discover beneath some photos from my dwelling lab:

Raspberry PI Pico 7 segment display details 01
Raspberry PI Pico 7 segment display details 02
Raspberry PI Pico 7 segment display details 03
Raspberry PI Pico 7 segment display details 04
Raspberry PI Pico 7 segment display details 05

Put together cabling in accordance with the earlier paragraph.

Get and Perceive my rpiPicoSegDisplay.py Code

Join RPI Pico to Thonny (you possibly can seek advice from my tutorial concerning the First steps with Raspberry PI Pico).

Now obtain the next file to make use of your passive buzzer:

You'll be able to each load it in your Raspberry PI Pico storage or run it out of your pc.

I’ll clarify all code traces within the following paragraphs.

To begin with, we import required libraries:

from machine import Pin

Then we outline 2 variables with Pin numbers. This can be a handy method as, if that you must change wirings, you possibly can set new GP numbers right here as a substitute of spreading round in our code. display_list collects all segments pins, ordered in order that they are going to match A, B, C, D, E, F and G LED segments:

display_list = [17,16,14,13,12,18,19]
dotPin=15

We’ll use arrays to make our code as shorter as doable. One in every of these arrays will accumulate the PIN objects. This array is first declared after which stuffed with a for loop which additionally set pins to out mode:

display_obj = []

for seg in display_list:
    display_obj.append(Pin(seg, Pin.OUT))

Similar PIN setting additionally for the one related to the dot LED:

dot_obj=Pin(dotPin, Pin.OUT)

One other array variable retains a mapping of numbers with their LED configuration. For instance, the quantity 0 (zero) has all of the LED on, besides the central phase (G). This will likely be represented by the arrSeg[0] that maps the “1,1,1,1,1,1,0” as A=1,B=1,C=1,D=1,E=1,F=1,G=0. Similar logic for all different numbers:

arrSeg = [[1,1,1,1,1,1,0], # -> arrSeq[0] shows 0
          [0,1,1,0,0,0,0], # -> arrSeq[1] shows 1
          [1,1,0,1,1,0,1], # -> arrSeq[2] shows 2
          [1,1,1,1,0,0,1], # -> arrSeq[3] shows 3
          [0,1,1,0,0,1,1], # -> arrSeq[4] shows 4
          [1,0,1,1,0,1,1], # -> arrSeq[5] shows 5
          [1,0,1,1,1,1,1], # -> arrSeq[6] shows 6
          [1,1,1,0,0,0,0], # -> arrSeq[7] shows 7
          [1,1,1,1,1,1,1], # -> arrSeq[8] shows 8
          [1,1,1,1,0,1,1]]  # -> arrSeq[9] shows 9

Right here I exploit a perform to regulate the 7 phase show in order that calling this perform with a string representing what quantity we need to present (with or with out the dot). This perform begins changing what's obtained right into a quantity (int() perform) and eradicating the trailing dot (“.”), if current. On this method the numDisplay variable is an integer quantity and can be utilized in following for loop to configure pins output:

def SegDisplay(toDisplay):
    numDisplay = int(toDisplay.change(".", ""))
    for a in vary(7):
        display_obj[a].worth(arrSeg[numDisplay][a])

Nonetheless contained in the SegDisplay() perform, we additionally handle the dot led activation by checking if the “.” is current within the enter worth:

    if toDisplay.rely(".") == 1:
        dot_obj.worth(1)
    else:
        dot_obj.worth(0)

Lastly, we use our perform by calling it with the specified output. For instance, quantity 5 with the dot led on will likely be name with following:

SegDisplay("5.")

If we don’t need the dot, merely name on this method:

SegDisplay("5")

The quantity can fluctuate from 0 to 9 and the parameter must be a string. When you have integer numbers, you should use the str() perform to transform them. An instance:

SegDisplay(str(5))

Take pleasure in!



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