Raspberry Pi 2 IR LIRC 紅外線遙控GPIO

參考來源
 http://www.jamesrobertson.eu/blog/2013/may/19/installing-lirc-on-raspbian.html

再用C寫一段程式去判斷紅外線接收到什麼訊號!

http://ozzmaker.com/how-to-control-the-gpio-on-a-raspberry-pi-with-an-ir-remote/ 

裝好LIRC後,使用irw 測試是否可正常接收資料時,可能會發生irw完全接收不到訊號的狀況(開機時執行checkir.sh來修改gpio的in and output function,可解決此狀況)

 設定lirc與遙控器配對時,須注意 namespace can use irread --list-namespace to check namespace

 再依序輸入正確的namespace 與按鍵配對 lircd.conf 在配對完成後會自動產生

    lircd.conf
# Please make this file available to others # by sending it to <lirc@bartelmus.de> # # this config file was automatically generated # using lirc-0.9.0-pre1(default) on Mon Apr 18 10:11:39 2016 # # contributed by # # brand: /home/pi/lircd.conf # model no. of remote control: # devices being controlled by this remote: # begin remote name /home/pi/lircd.conf bits 16 flags SPACE_ENC|CONST_LENGTH eps 30 aeps 100 header 8993 4472 one 600 1654 zero 600 527 ptrail 598 repeat 8978 2211 pre_data_bits 16 pre_data 0xFF gap 107705 toggle_bit_mask 0x0 begin codes KEY_0 0x6897 KEY_1 0x30CF KEY_2 0x18E7 KEY_3 0x7A85 KEY_4 0x10EF KEY_5 0x38C7 KEY_6 0x5AA5 KEY_7 0x42BD KEY_8 0x4AB5 KEY_9 0x52AD end codes end remote

 checkir.sh

#!/bin/bash mtaskno=`ps -ef | grep 'irread.py' | grep -v 'grep' | wc -l` if [ $mtaskno -eq 0 ] then echo "irread.py not exec! Now starting..." sudo python /home/pi/irread.py & else echo "irread.py running..." fi sleep 50 mtaskno=`ps -ef | grep 'sudo /home/pi/rpi_gpio_lirc' | grep -v 'grep' | wc -l` if [ $mtaskno -eq 0 ] then echo "rpi_gpio_lirc not exec ! Now starting..." sudo /home/pi/rpi_gpio_lirc & else echo "rpi_gpio_lirc running..." fi sleep 50 sudo killall python
sudo killall python : This irread.py will use about 25% cpu ,so 結束這個python task,IR也可以正常使用,ps:可能是測試時安裝多種lirc,lirc_python or gpio的關係?? raspberry pi can not receve IR songal so,不小心測試到這樣的方式...
不重複執行rpi_gpio_lirc , 重複執行會造成繼電器誤動作

若沒有先執行irread.py to initial gpio ,就直接執行rpi_gpio_lirc會造成所有控制中的gpio pin 全部
輸出 '0' 則會使全部的繼電器斷電,所以在執行checkir.sh時,會用sleep 50(50 sec) 來排除繼電器全斷的問題!

irread.py
#!/usr/bin/env python # author: Powen Ko import time import RPi.GPIO as GPIO GPIO.setmode(GPIO.BOARD) GPIO.setwarnings(False) GPIO_ECHO = 23 print "IR Signal" GPIO.setup(GPIO_ECHO,GPIO.IN) GPIO.setup(29,GPIO.OUT) GPIO.output(29,True) GPIO.setup(31,GPIO.OUT) GPIO.output(31,True) GPIO.setup(33,GPIO.OUT) GPIO.output(33,True) GPIO.setup(35,GPIO.OUT) GPIO.output(35,True) GPIO.setup(37,GPIO.OUT) GPIO.output(37,True) start=0 stop=0 duringDown=0 while True: start = time.time() duringDown=start-stop while GPIO.input(GPIO_ECHO)==0: start = time.time() while GPIO.input(GPIO_ECHO)==1: stop = time.time() duringUp = stop-start info = "Up:%7.f" % (duringUp *100000) + ",Down:%7.f" % (duringDown*100000) print info if duringUp>0.1: print("------------------") GPIO.cleanup()

rpi_gpio_lirc.c

#include <wiringPi.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <lirc/lirc_client.h> #include <time.h> void flipLED (int led); //The WiringPi pin numbers used by our LEDs #define LED1 25 //atur #define LED2 24 //router #define LED3 23 //mod #define LED4 22 //tv #define LED5 21 //printer #define ON 1 #define OFF 0 int main(int argc, char *argv[]) { struct lirc_config *config; //Timer for our buttons int buttonTimer = millis(); char *code; char *c; //Initiate WiringPi and set WiringPi pins 4, 5 & 6 (GPIO 23, 24 & 25) to output. These are the pins the LEDs are connected to. if (wiringPiSetup () == -1) exit (1) ; pinMode (LED1, OUTPUT); pinMode (LED2, OUTPUT); pinMode (LED3, OUTPUT); pinMode (LED4, OUTPUT); pinMode (LED5, OUTPUT); //Initiate LIRC. Exit on failure if(lirc_init("lirc",1)==-1) exit(EXIT_FAILURE); //Read the default LIRC config at /etc/lirc/lircd.conf This is the config for your remote. if(lirc_readconfig(NULL,&config,NULL)==0) { //Do stuff while LIRC socket is open 0=open -1=closed. while(lirc_nextcode(&code)==0) { //If code = NULL, meaning nothing was returned from LIRC socket, //then skip lines below and start while loop again. if(code==NULL) continue;{ //Make sure there is a 400ms gap before detecting button presses. if (millis() - buttonTimer > 400){ //Check to see if the string "KEY_1" appears anywhere within the string 'code'. if(strstr (code,"KEY_1")){ printf("MATCH on KEY_1 ATUR\n"); flipLED(LED1); buttonTimer = millis(); } else if(strstr (code,"KEY_2")){ printf("MATCH on KEY_2 ROUTER\n"); flipLED(LED2); buttonTimer = millis(); } else if(strstr (code,"KEY_3")){ printf("MATCH on KEY_3 MOD \n"); flipLED(LED3); buttonTimer = millis(); } else if (strstr (code,"KEY_4")){ printf("MATCH ON KEY_4 TV\n"); flipLED(LED4); buttonTimer = millis(); } else if (strstr (code,"KEY_5")){ printf("MATCH on KEY_5 PRINTER\n"); flipLED(LED5); buttonTimer = millis(); } } } //Need to free up code before the next loop free(code); } //Frees the data structures associated with config. lirc_freeconfig(config); } //lirc_deinit() closes the connection to lircd and does some internal clean-up stuff. lirc_deinit(); exit(EXIT_SUCCESS); } void flipLED (int led) { //If LED is on, turn it off. Otherwise it is off, so thefore we need to turn it on. if(digitalRead(led)==ON){ digitalWrite(led, OFF); printf("gpio off\n"); } else { digitalWrite(led, ON); printf("gpio on\n"); } }