1. Buy a card from China travel.
2. Coal mine underground transportation gateway generally refers to the raw coal transportation roadway; The track gateway is usually used as the auxiliary roadway for transporting materials when the fully mechanized working face is arranged with "three roadways". In most cases, the belt conveyor (belt conveyor) is mostly arranged in the transport chute roadway, at this time, the belt conveyor has no direct relationship with the track chute. I understand that your question mainly refers to how to simplify and optimize the design of fully mechanized working face with "two lanes" layout. First, it is necessary to simplify and optimize the support, driving mode, driving type, driving cycle and driving technology of roadway design based on the geological structural conditions of coal seam; Second, we should focus on the coal
mining technology, coal mining methods and layout of coal mining equipment; third, we should strengthen the hydrological and geological prediction of the fully mechanized working face and its surrounding areas; Fourth, fully considering the installation and transportation of fully mechanized mining equipment, reasonably arranging the technical parameters of roadway formation based on the maximum size of fully mechanized mining equipment; Fifthly, the quantity of work needed for equipment replacement, compressed air supply, water supply, drainage and improvement of various systems should be considered; Sixth, it is necessary to reasonably allocate the relationship between the recovery equipment and the ending conditions of the mining face after the ending.
3. It should be above 3V... The voltage range of L298N seems to be 2.5V to more than 40 v... It is recommended that the voltage greater than 5V and less than 9V are OK. The overload capacity of DC motor is very strong, but it is necessary to ensure that it can provide enough current and the voltage should be stable
4. The length, width and height of raspberry pie were 85.60mm x 56mm x 21mm and 45g respectively. The connector will protrude a little from the edge of the board, and the SD card will be half exposed outside after it is inserted
raspberry PI (Chinese name is "raspberry pie", abbreviated as RPI, or raspi / RPI) is designed for students' computer programming ecation. It is a card type computer only the size of a credit card, and its system is based on Linux. Since its inception, it has been sought after by many computer enthusiasts and makers. Although its appearance is "Petite", its inner "heart" is very powerful. It has video, audio and other functions. It can be said that although a sparrow is small, it has all five internal organs
the real raspberry pie (Chinese name) is translated from raspberry PI, that is to say, raspberry pie is raspberry PI. Raspberry pie was first called by a reporter from CCTV< br />
5. It's all standard
USB interface: 5V voltage
GPIO: 5V voltage
the board is also 5V power supply.
6. A: just like other routers, use the browser to enter 192.168.1.1, the user name and password are admin, and enter the settings page. If you can't get in or open other devices, connect the router and computer separately. Don't connect the network cable of other devices.
7. The default is 600mA. Add Max in config.txt_ usb_ Current = 1, the output is 1.2A maximum.
8. Raspberry pie is slow. But openwrt is really good. It can also be installed on raspberry pie. But the CPU of raspberry pie is usually much better than the 100 yuan router. About four times.
9. armv7 is 32-bit
armv8 architecture introces 64 bit support for ARM architecture, focusing on the realization of energy saving, while maintaining compatibility with existing 32-bit software. By adopting a clean approach, armv8-a processor expands the available performance range while maintaining the low power consumption characteristics of ARM processor, which will provide power for the most innovative and efficient devices in the future. Arm has three different proct levels to support armv8-a architecture: high performance, high efficiency and super efficiency
armv8-a introces 64 bit architecture support for ARM architecture, including:
< UL > 64 bit general register, SP (stack pointer) and PC (program counter)
64 bit data processing and extended virtual addressing
two main execution states:
aarch 64 - 64 bit execution state, including exception mode and memory mode, Programmer model and instruction set support
aarch32 - 32-bit execution state, including exception model, memory model, programmer model and instruction set supporting this state
< / UL > lower than armv8 (such as armv7) is 32-bit
