raspberry pi led control

0 PrefaceThis article describes how to control the Raspberry Pi gpio port through the file IO sysfs. Control gpio through sysfs, first access the/sys/class/gpio directory, write the gpio number to the export file, so that the operation interface of this gpio is exposed from the kernel space to the user space, gpio oper

(); Show An error if there is no Gpio controller if (GPIO = = null) { pin = null; Gpiostatus.text = "There is no GPIO controller on this device."; return; } Pin = Gpio. Openpin (Led_pin); Show an error if the pin wasn ' t initialized properly if (pin = = null) { Gpiostatus.text = "There were PR Oblems initializing the GPIO pin. "; return; } Pin. Write (Gpiopinvalue.high); Pin. Setdrivemode (gpiopindrivemode.output); Gpiostat

Raspberry PI 3 to create a music player 1. Software Environment sudo apt-get update sudo apt-get upgrade sudo apt-get install mplayer2//music playback software sudo apt-get install Alsamixergui//volume control 2. Prepare the song Find a song. MP3 Songs Here is a: wget Http://blog.lxx1.com/wp-content/uploads/2016/07/shero.mp3 3, set the

=Bayi1366x768 60hzhdmi_mode= the1080p 60hzhdmi_mode= the1600x900reduced Blankinghdmi_mode= -1920x1200 Reduced Blankinghdmi_mode= -720p 60hzhdmi_mode= the1366x768 reduced blankingView CodeConfig.txt file class specific parameter meaning, you can refer to the following documents:Http://www.shumeipai.net/thread-19043-1-1.html5, the Raspberry Pi link on the display device, the SD card into the

Sometimes it is not convenient to directly operate Raspberry Pi. You may want to use other computers to remotely control Raspberry Pi. VNC is a graphical interface shared by the system. It allows you to remotely control the deskto

Summer vacation to play Raspberry Pi, encountered many problems, so the mind to put these basic problems and solutions to organize, convenient for others and later on their own inspection. Raspberry PI System formatting Sometimes the system crashes and cannot continue to use. such as updating the software when the

We have explained in detail the Raspberry Pi control ultrasonic module ranging (http://www.cnblogs.com/yuemo/p/8888342.html) and ultrasonic control buzzer module audible (http://www.cnblogs.com/ yuemo/p/8906111.html).Today we'll see how to apply all two modules and make an anti-theft device.First look at the connection

General Purpose Input Output (Universal input/output) abbreviated as GPIO, or bus extender, simplifies the expansion of I/O ports with industry standard I²C, SMBus, or SPI interfaces. GPIO products provide additional control and monitoring capabilities when the microcontroller or chipset does not have enough I/O ports or when the system requires remote serial communication or control.This article has nothing to say, mainly stickers! But this article i

d.authoritative;At the bottom of the file add the following lines:Subnet 192.168.42.0 netmask 255.255.255.0 {range 192.168.42.10 192.168.42.50;option broadcast-address 192.168.42.255;o ption routers 192.168.42.1;default-lease-time 600;max-lease-time 7200;option domain-name "local"; option Domain-name-servers 8.8.8.8, 8.8.4.4;}Make the wireless adapter the default for the DHCP request:sudo vim/etc/default/isc-dhcp-serverChange "to INTERFACES="" " INTERFACES="wlan0" "Restart the DHCP server:sudo

To make it easier to connect and control the Raspberry Pi over the network, use SECURECRT to connect the Raspberry Pi over the network. 1, on the Raspberry Pi through the terminal comma

first, the simplest method on the Raspberry Pi is to use apt-get and then give control to the Openhab user.sudo apt-get install openhab-addon-binding--hr Openhab:openhab/usr/share/openhabNext, you need to tell Openhab to load the binding and configure all the required variables. go to the configuration folder, copy a copy of Openhab-default.cfg, and name it open

If you're bored with a smart home that just has to download a specific app to control a light, here's the good news: Openhab can give you the most flexible control of smart home, Openhab is a mature, open source home automation platform that can run a lot of software, There is no agreement, which means it can now be connected to almost all of the home automation hardware on the market.Here we will show you

FileZilla on Windows to make an SFTP connection with the connection address starting with sftp://. You can no longer use stand-alone displays and keyboards."Timed Shutdown"sudo crontab-u root-eAdd the following content* * * */sbin/init 0"Start-up Run"sudo nano/etc/rc.localAdd the following contentsudo nohup python-u/home/pi/unlockhandler.py >/home/pi/unlockhandler.log 2>1 "Download Installation Dependencie

Environment: Raspbian-stretch (2018-06-27)Raspberry Pi: 3 generation B Type1, Raspberry Pi equipment, need to be in the field can also have independent networking capabilities, it is necessary to use the Internet of Things module.The SIM868 communication module for micro-snow is used here, such as:2, will SIM868 insert

the wireless module will be high when the aux is initialized.Note: minicom communication or use other serial port programming library must pay attention to some details, 8N1 8 = 8 bytes, n= invalid verification bit, 1 = stop bit, these must be set the same, there are hardware flow control and software flow control all shut down (minicom has this option, If you do not set the hardware flow

First recommend a few mobile phone software in the cool Ann network should be able to find1.JuiceSSH Orange SSH software mobile phone connected to the router can control the LAN in the Raspberry Pi2.VNC Viewer Remote Desktop software VNC is also a LAN-connected Raspberry PiThese software is still very useful, do not want to open the computer, you can

The official Raspberry Pi camera Module, capable of shooting 5 million megapixel images and recording 1080p video, uses the CSI interface on the Raspberry Pi board.Installing the CameraFirst make sure that the Raspberry Pi system

First, the previous figure: Accessories used: 1. Main Character: Raspberry Pi 2. secondary role: Infrared Detection 3. Miscellaneous: bread, DuPont wire, buzzer, led, resistor The infrared detection has three pins. The power supply at both ends and the signal output in the middle directly connect the signal to a gpio of