Raspberry Pi Real Time Clock

Raspberry PI RTC Clock

This project is meant to drive 2 2 digit 7-segment displays to create a fully functional clock that you can use in your room or study place.

More details and further code changes can be found on github: https://github.com/Sani7/RTC-Clock

The raspberry PI get's the time from the internet afther that it decodes it in to a useable number for each digit.

For a connection diagram please use the schematic below.

There are 3 main functions:

SetDigits: This function gets a number from 0-9 and if the Decimal Point needs to be on or off and does this to the correct pins
DisplayDigits: gets a number from 0-9 and if the Decimal Point needs to be on or off and gives it to the SetDigits function and the number of the segment that needs to light up
GetTimeToDigits: This function decodes the time from the datetime function to useable numbers like segment 1: 1, segment 2: 0, segment 3: 2, segment 4: 2 and the leds need to be on.

Raspberry Pi Real Time Clock - BOM

Raspberry Pi Hat socket GPIO Header SMT 2X20 pin, Female 1x Raspberry Pi Hat Socket Riser Header 2X20 pin, Long, Female 1x 2 Digit 7-Segment Display oranje 18 pin, Orange 2x Resistor 68 ohm 500mW 10x Raspberry Pi single board computer 1x Male-Female 10 cm band cable 40 pieces Jumpwires to connect to the PI 1x € 2,¹⁰ € 2,¹⁰  Total: € 2,¹⁰

Raspberry Pi Real Time Clock - Library Code

#library for RTC clock
import time
import datetime
import math
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(5, GPIO.OUT)
GPIO.setup(26, GPIO.OUT)
GPIO.setup(16, GPIO.OUT)
GPIO.setup(13, GPIO.OUT)
GPIO.setup(19, GPIO.OUT)
GPIO.setup(21, GPIO.OUT)
GPIO.setup(20, GPIO.OUT)
GPIO.setup(6, GPIO.OUT)
GPIO.setup(4, GPIO.OUT)
GPIO.setup(17, GPIO.OUT)
GPIO.setup(27, GPIO.OUT)
GPIO.setup(22, GPIO.OUT)
GPIO.setup(18, GPIO.OUT) #LEDS

Digit = (5, 26, 16, 13, 19, 21, 20, 6) # LB, LO, RB, RO, MO, MM, MB, DP
Select = (4, 17, 27, 22) # D1, D2, D3, D4

t = GPIO.HIGH
f = GPIO.LOW

def SetDigits(Decimal, DP):
        global Digit
        if Decimal == 0:
                GPIO.output(Digit, (f, f, f, f, f, t, f, t))
        elif Decimal == 1:
                GPIO.output(Digit, (t, t, f, f, t, t, t, t))
        elif Decimal == 2:
                GPIO.output(Digit, (t, f, f, t, f, f, f, t))
        elif Decimal == 3:
                GPIO.output(Digit, (t, t, f, f, f, f, f, t))
        elif Decimal == 4:
                GPIO.output(Digit, (f, t, f, f, t, f, t, t))
        elif Decimal == 5:
                GPIO.output(Digit, (f, t, t, f, f, f, f, t))
        elif Decimal == 6:
                GPIO.output(Digit, (f, f, t, f, f, f, f, t))
        elif Decimal == 7:
                GPIO.output(Digit, (t, t, f, f, t, t, f, t))
        elif Decimal == 8:
                GPIO.output(Digit, (f, f, f, f, f, f, f, t))
        elif Decimal == 9:
                GPIO.output(Digit, (f, t, f, f, f, f, f, t))
        else:
                raise ValueError('Value Decimal is out of range')
        if DP == 1:
                GPIO.output(6, f)
        else:
                GPIO.output(6, t)

def DisplayDigit(InDecimal, DP, InDigit):
        global Select
        SetDigits(InDecimal, DP)
        if InDigit == 1:
                GPIO.output(Select, (t, f, f, f))
        elif InDigit == 2:
                GPIO.output(Select, (f, t, f, f))
        elif InDigit == 3:
                GPIO.output(Select, (f, f, t, f))
        elif InDigit == 4:
                GPIO.output(Select, (f, f, f, t))
        else:
                raise ValueError('Value InDigit is out of range')

def wachten():
        time.sleep(.001)

def DisplayLeds(StatusLeds):
        if StatusLeds:
                GPIO.output(18, t)
        else:
                GPIO.output(18, f)

def GetTimeToDigit():
        now = datetime.datetime.now()
        hour = now.hour
        hour10 = math.floor(hour / 10)
        hour1 = hour % 10
        minute = now.minute
        minute10 = math.floor(minute / 10)
        minute1 = minute % 10
        Leds = now.second % 2 == 0
        return (hour10, hour1, minute10, minute1, Leds)

Raspberry Pi Real Time Clock - Main Code

from clock import *

try:
        while (1):
                (Digit1, Digit2, Digit3, Digit4, Leds) = GetTimeToDigit()
                DisplayDigit(Digit1, 1, 1)
                Delay()
                DisplayDigit(Digit2, 1, 2)
                Delay()
                DisplayDigit(Digit3, 1, 3)
                Delay()
                DisplayDigit(Digit4, 1, 4)
                Delay()
                DisplayLeds(Leds)

except KeyboardInterrupt:
        GPIO.cleanup()

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Raspberry Pi Real Time Clock

Raspberry PI RTC Clock

Raspberry Pi Real Time Clock - BOM

Raspberry Pi Real Time Clock - Library Code

Raspberry Pi Real Time Clock - Main Code

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