diamond2016
Published © GPL3+

Two Digits Led display with PICO and LB-402-MD

This is a Raspberry Pico project, with a micropython app to manage the LB-402-Dn series two-digits led display. In the example LB-402-MD.

BeginnerProtip265
Two Digits Led display with PICO and LB-402-MD

Things used in this project

Hardware components

Rohm LB-402-DN
×1
Raspberry Pi Pico
Raspberry Pi Pico
×1
Resistor 221 ohm
Resistor 221 ohm
×2
Breadboard (generic)
Breadboard (generic)
×1
Male/Female Jumper Wires
Male/Female Jumper Wires
×16

Story

Read more

Schematics

pin assignements

connections PICO - display module

PICo pins

PICO datasheet

Breadboard with display and connections from PICo

foto

Code

lb402md.py

Python
Micropython code for display LB-402-MD. In the example set datetime from pc in rtc of pico, display hh - mm - ss in sequence in the display.
#diamond2016 - richardg - 25.04.2022
# lb402md
from machine import Pin
import utime
from machine import RTC

# assigns segments of pl402md to pico pins value 1 (high is led off)
display_dict = {
    'e1':Pin(1, Pin.OUT, pull=None, value=1),
    'd1':Pin(2, Pin.OUT, pull=None, value=1),
    'c1':Pin(3, Pin.OUT, pull=None, value=1),
    'dp1':Pin(4, Pin.OUT, pull=None, value=1),
    'e2':Pin(5, Pin.OUT, pull=None, value=1),
    'd2':Pin(6, Pin.OUT, pull=None, value=1),
    'g2':Pin(7, Pin.OUT, pull=None, value=1),
    'c2':Pin(8, Pin.OUT, pull=None, value=1),
    'dp2':Pin(9, Pin.OUT, pull=None, value=1),
    'b2':Pin(10, Pin.OUT, pull=None, value=1),
    'a2':Pin(11, Pin.OUT, pull=None, value=1),
    'f2':Pin(12, Pin.OUT, pull=None, value=1),
    'b1':Pin(13, Pin.OUT, pull=None, value=1),
    'a1':Pin(14, Pin.OUT, pull=None, value=1),
    'g1':Pin(15, Pin.OUT, pull=None, value=1),
    'f1':Pin(16, Pin.OUT, pull=None, value=1)
}

all_dig1 = {'e1','d1','c1','b1','a1','g1','f1'}
all_dig2 = {'e2','d2','g2','c2','b2','a2','f2'}
zero_dig1 = {'e1','d1','c1','b1','a1','f1'}
zero_dig2 = {'e2','d2','c2','b2','a2','f2'}
digits_dict = {
    ('L',0): zero_dig1,
    ('L',1): {'b1', 'c1'},
    ('L',2): all_dig1 - {'f1', 'c1'}, 
    ('L',3): all_dig1 - {'f1', 'e1'},
    ('L',4): all_dig1 - {'a1', 'd1', 'e1'}, 
    ('L',5): all_dig1 - {'b1', 'e1'},
    ('L',6): all_dig1 - {'a1', 'b1'},
    ('L',7): {'a1', 'b1', 'c1'},
    ('L',8): all_dig1,
    ('L',9): all_dig1 - {'e1'},
    ('L','p'): {'dp1'},
    ('R',0): zero_dig2,
    ('R',1): {'b2', 'c2'},
    ('R',2): all_dig2 - {'f2', 'c2'},
    ('R',3): all_dig2 - {'f2', 'e2'},
    ('R',4): all_dig2 - {'a2', 'd2', 'e2'},    
    ('R',5): all_dig2 - {'b2', 'e2'},
    ('R',6): all_dig2 - {'a2', 'b2'},
    ('R',7): {'a2', 'b2', 'c2'},
    ('R',8): all_dig2,
    ('R',9): all_dig2 - {'e2'},
    ('R','p'): {'dp2'} 
}

def go(cmd):
    if cmd == "L":
        for k in display_dict.keys():
            if (k[-1] == '1'):
                led = display_dict[k]
                print ("led: " + k)
                led.toggle()
                utime.sleep(1.0)
                led.toggle()
    elif cmd == "R":
        for k in display_dict.keys():
            if (k[-1] == '2'):
                led = display_dict[k]
                print ("led: " + k)
                led.toggle()
                utime.sleep(1.0)
                led.toggle()                
           
    else:
        led = display_dict[cmd]
        print ("led: " + cmd)
        led.toggle()
        utime.sleep(2.0)
        led.toggle() 

def reset (digit):
    if digit == 'L':
        for k in all_dig1:
            led = display_dict[k]
            led.value(1)
        led = display_dict['dp1']
        led.value(1)
    elif digit == 'R':
        for k in all_dig2:
            led = display_dict[k]
            led.value(1) #high is led off
        led = display_dict['dp2']
        led.value(1)
    else:
        reset('L')
        reset('R')            
            
def display():
    for k in digits_dict.keys():
        set = digits_dict[k]
        reset()
        for segment in set:
            print (segment)
            led = display_dict[segment]
            led.value(0) #low is led on
        utime.sleep(1.0)   

def show(digit, number):
    set = digits_dict[(digit, number)]
    reset(digit)
    for segment in set:
        print (segment)
        led = display_dict[segment]
        led.value(0) #low is led on

def show2Digits(number):
    if (number > 99):
        return
    reset(0)
    l = number // 10
    show('L',l)
    r = (number - l * 10) % 10
    show('R',r)
    
def hhmm ():
    rtc = machine.RTC()
    # (year, month, day[, hour[, minute[, second[, microsecond[, tzinfo]]]]]) 
    rtc.datetime()
    print(rtc.datetime()[4])
    show2Digits(rtc.datetime()[4]) 
    utime.sleep (2.0)
    show2Digits(rtc.datetime()[5])
    utime.sleep (2.0)
    show2Digits(rtc.datetime()[6])
    utime.sleep (2.0)
    
while True:
    hhmm()

Credits

diamond2016

diamond2016

2 projects • 8 followers

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