Introduction

My name is Ryosuke Kamei and I am an IT consultant based on the idea of "gentle IT"! Currently, in my work, I am doing upstream processes focusing on requirements analysis and requirements definition, but I also write programs! As part of our friendly IT activities, we will introduce "Raspberry Pi 3" (commonly known as Raspberry Pi), which has the philosophy of "providing inexpensive PCs that can be programmed for education"!

This time, we will output a number (1 digit) to the 7-segment LED! It is a temperature sensor that uses an analog temperature sensor and an A / D converter! [Razpai Magazine-June 2016 Special Feature 1 Akiba's Popular Parts Wiring Diagram Best 17 15 Numbers can be displayed](https://www.amazon.co.jp/ Razpai Magazine-June 2016 Issue-Nikkei BP PC Best Mook -? Nikkei Linux-ebook / dp / B01EH2RX42 / ref = as_li_ss_tl ie = UTF8 & dpID = 61P3o6Agz + L & dpSrc = sims & preST = OU09__BG0,0,0,0_FMpng_AC_UL160_SR120,160 & psc = 1 & refRID = 31SKG5E0DGKBSF9BWNGV & linkCode = ll1 & tag = sr2smail-22 & linkId = 18fd04738627edef8d6fffd6c9b8f9c2) Is referred to.

procedure

Wiring
Program 7segment.py
Run the program

1. Wiring

Wiring diagram is [Razpai Magazine-June 2016 issue Special feature 1 Akiba's popular parts Wiring diagram best 17 15 Numbers can be displayed](https://www.amazon.co.jp/ Razpai Magazine-2016 6 Monthly issue-Nikkei BP PC Best Mook-Nikkei Linux-ebook / dp / B01EH2RX42 / ref = as_li_ss_tl? 22 & linkId = 18fd04738627edef8d6fffd6c9b8f9c2) As it is.

If you get an image like this, referring to the picture of the circuit Raspberry Pi 3でpythonを使い「7セグメントLED」に出力する！回路.jpg

I also made a video

Text version From the Raspberry Pi side

--Raspberry Pi 12th pin --7 segment driver 7 D0 --Raspberry Pi 23rd pin --7 segment driver 1 D1 --Raspberry Pi 24th pin --7 segment driver 2 D2 --Raspberry Pi 25th pin --7 segment driver 3 D3 --Raspberry Pi 6th pin (GND) --7 segment driver 5 LE --Raspberry Pi 6th pin (GND) --7 segment driver 8 GND --Raspberry Pi 6th pin (GND) --7 segment LED 3 GND --Raspberry Pi 6th pin (GND) --Battery minus side

7-segment driver side

--7-segment screwdriver 3 LT --Battery (3V) plus side ―― 7-segment screwdriver 4 BL ――Battery (3V) plus side --7-segment screwdriver 16 Vcc --Battery (3V) plus side --7-segment driver 13 a --Resistance (150Ω) --7-segment LED 7 A --7-segment driver 12 b --Resistance (150Ω) --7-segment LED 6 B ―― 7-segment driver 11 c ―― Resistance (150Ω) ―― 7-segment LED 4 C --7-segment driver 10 d --Resistance (150Ω) --7-segment LED 2 D ―― 7-segment driver 9 e --Resistance (150Ω) ―― 7-segment LED 1 E --7-segment driver 15 f --Resistance (150Ω) --7-segment LED 9 F --7-segment driver 14 g --Resistance (150Ω) --7-segment LED 10 G

2. Program 7segment.py

Program is also [Razpai Magazine-June 2016 Issue Special Feature 1 Akiba's Popular Parts Wiring Diagram Best 17 15 Numbers can be displayed](https://www.amazon.co.jp/ Razpai Magazine-June 2016 Issue -Nikkei BP PC Best Mook-Nikkei Linux-ebook / dp / B01EH2RX42 / ref = as_li_ss_tl? Ie = UTF8 & dpID = 61P3o6Agz + L & dpSrc = sims & preST = _OU09__BG0,0,0,0_FMpng_AC_UL160_SR120,0_FMpng_AC_UL160_SR120 It is based on 18fd04738627edef8d6fffd6c9b8f9c2).

The source is uploaded to GitHub, so please use it as you like.

`Clone with git`


$ git clone https://github.com/RyosukeKamei/raspberrypi3.git

`7segment.py`


#Library to control GPIO
import wiringpi
#Timer library
import time
#Get arguments
import sys

#Specify the GPIO terminal number connected to 74HC5411 (7-segment driver)
d0_pin = 18
d1_pin = 23
d2_pin = 24
d3_pin = 25

#Put each terminal in output mode
wiringpi.wiringPiSetupGpio()
wiringpi.pinMode( d0_pin, 1 )
wiringpi.pinMode( d1_pin, 1 )
wiringpi.pinMode( d2_pin, 1 )
wiringpi.pinMode( d3_pin, 1 )

#Initialize all to 0
wiringpi.digitalWrite( d0_pin, 0 )
wiringpi.digitalWrite( d1_pin, 0 )
wiringpi.digitalWrite( d2_pin, 0 )
wiringpi.digitalWrite( d3_pin, 0 )

#Get arguments
param = sys.argv
set_number = int(param[1])

if( set_number >= 0 and set_number < 10):
    #Take the AND of the 1st bit
    wiringpi.digitalWrite( d0_pin, set_number & 0x01 )

    #Take the AND of the second bit
    wiringpi.digitalWrite( d1_pin, set_number & 0x02 )

    #Take the AND of the 3rd bit
    wiringpi.digitalWrite( d2_pin, set_number & 0x04 )

    #Take the AND of the 4th bit
    wiringpi.digitalWrite( d3_pin, set_number & 0x08 )
else:
    print("error:The arguments are 0-9.")