Raspberry Pi IR Infrared Send/Infrared Receive Tutorial

Development environment:

[] LIRC Version：0.10.1-6.3

[] Raspberry Pi：4B

[] Raspbian OS; (32 bit)Linux raspberrypi 5.15.84-v7l+

Install the LIRC software and configure:

Install lirc：

sudo apt-get update

sudo apt-get install lirc

driver configuration：

Edit the config.txt configuration file in the /boot directory

sudo nano /boot/config.txt

Find the configuration to enable the infrared function in config.txt

# Uncomment this to enable infrared communication.

#dtoverlay=gpio-ir,gpio_pin=18

#dtoverlay=gpio-ir-tx,gpio_pin=17

Remove the comment '#' in front of dtoverlay

# Uncomment this to enable infrared communication.

dtoverlay=gpio-ir,gpio_pin=18

dtoverlay=gpio-ir-tx,gpio_pin=17

#gpio-ir corresponds to the infrared receiver; gpio-ir-tx corresponds to the infrared transmitter

Restart the system：

sudo reboot

# After configuring the /boot/config.txt file, it needs to be restarted to take effect

Configure the /etc/lirc/lirc_options.conf file

sudo nano /etc/lirc/lirc_options.conf

Find the 'driver' and 'device' options in the file, and delete the parameters after '='

driver = devinput

device = auto

Modify the value of driver and device：

# change into

driver = default

device = /dev/lirc0

# device 的值改成/dev/lirc1也行，但经测试，改为/dev/lirc1时无法使用红外发射功能

Test the receiving function of the infrared module

Start infrared driver

mode2 -d /dev/lirc1

#If it fails, it may be necessary to stop the lircd service to enter the infrared signal receiving mode. You can run sudo service lircd stop first and then run the infrared receiving command

Testing of IR modules using any IR remote control device

When the infrared remote control is aimed at the infrared module and pressed, the terminal will display a code similar to the following, indicating that the infrared reception is normal

Test the infrared module emission function

The Raspberry Pi can transmit and receive infrared signals through the lirc library, so it is necessary to configure the infrared signal through the lirc library before launching

The lirc package has an irrecord command that can configure keys, but the accuracy is not high.。

Here we only use it to output the configuration file format

sudo irrecord -f -d /dev/lirc1

Prompt Press RETURN to continue. Enter, then wait, do not press the remote control button

Prompt Enter name of remote (only ascii, no spaces) : enter the name of the configuration file

Prompt Press RETURN now to start recording. Enter to start recording

Afterwards, enter freely (you can keep pressing a key, if the point appears slowly, it is likely that sudo was not added before the command), we are just to obtain the configuration file format, the official requirement is to press different remote control keys, at least one will appear points, but not more than 10 points, until a prompt appears

Next, you will be asked to enter the key name, and then press and hold the key. Here, it is recommended to use names similar to KEY_1 and KEY_2 (see Attachment 1 below for details), so that no error will be reported. By default, there is a requirement for the key name format. If you ignore it, you can Add after the irrecord command--disable-spacename

Just enter one or two keys, press Enter to end, we just want to get the configuration file format

After pressing Enter, the yopur.lirc.conf file may be directly generated in the current directory, or it may be finished after pressing a key (note! Press a key, press it quickly, not hold it down!)

Copy template to /etc/lrc/lircd.conf

sudo cp your_files /etc/lirc/lircd.conf #your_ Files is the file name you configured in the previous step

Infrared emission test:：

sudo service lircd restart #Restart service (required!!!!)

sudo irw

#Press the previously recorded button towards the infrared receiver. The console will display the following format fields:

#000000 xxxxxxxx xx button name remote control name

Launch command: irsend SEND_ ONCE remote control name button name

irsend SEND_ONCE orange_scale_ir KEY_0

#KEY_ 0 is a user-defined name when configuring remote control buttons

Check if the infrared module emits:

a.Start another Linux terminal

b.The first terminal enables infrared reception function

mode2 -d /dev/lirc1

The second terminal enables infrared emission function

irsend SEND_ONCE SportPrear_Test KEY_0

#SportPrear_ Test is the user-defined configuration file name when configuring remote control buttons

#KEY_ 0 is the user-defined key name when configuring remote control buttons

Emission and reception effects

Key tutorial

Press Button 1 (or Button 2) to print the effect on the console

Creating Python test files

sudo nano key.py

Writing Python testing code

import RPi.GPIO as GPIO

import time

KEY =22

GPIO.setmode(GPIO.BCM)

GPIO.setup(KEY,GPIO.IN,GPIO.PUD_UP)

while True:

time.sleep(0.05)

if GPIO.input(KEY) == 0:

print("KEY PRESS")

while GPIO.input(KEY) ==0:

time.sleep(0.01)

Running Python Test Code Files

python ./key.py

d.Test rendering

Press Button 1 (or Button 2) to emit infrared effect

a.Modify the above code to

#According to the module schematic, the Button is located at pins 22 and 27

import RPi.GPIO as GPIO

import os

import time

KEY =22

GPIO.setmode(GPIO.BCM)

GPIO.setup(KEY,GPIO.IN,GPIO.PUD_UP)

while True:

time.sleep(0.05)

if GPIO.input(KEY) == 0:

os.system('irsend SEND_ONCE SpotPrear_Test KEY_0')

print("KEY SEND TEST")

while GPIO.input(KEY) ==0:

time.sleep(0.01)

Experimental phenomena

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

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