SDIO: data port GPIO: It may also be a data port or a interrupt (no chip or circuit diagram, can not be judged) GND, 3V need not explain. Directly use IO port control, it is estimated to simulate SPI timing.
NRF905 wireless communication module is SPI interface communication, if I remember correctly, it should be 3V power supply; The general I/O port of the single chip microcomputer can be connected, and the general I/O port can use software to simulate SPI communication, if you use a single chip microcomputer with a hardware SPI module, it is recommended to use a dedicated SPI interface, because the speed of the use of universal I/O analog SPI is not faster than the speed of the dedicated SPI.
Note that the IO port of nRF24L01 should be connected to the "high resistance pin" of the 51 MCU (generally P0 port). However, some models of P0 are not high resistance, please check the chip's manual for this.
Whether the module provides a serial port. If you do, use it. If not, use the CPU PCI bus. Then the OS control is embedded through the CPU2 >
can use a digital integrator, simpler; Analog integrators can also be used, which makes design and debugging very difficult.
It uses frequency division multiplexing technology to divide the ordinary telephone line into three relatively independent channels: telephone, uplink and downlink, so as to avoid interference between each other. Typically ADSL can provide up to 5Mbps upstream and up to 24Mbps downstream without affecting normal telephone communication.
Delete a random startup What is a random startup? Random boot programs are programs that are loaded at boot time.
1, Tesla coil is also called Tesla coil, because it is directly transliterated from the English name Tesla. This is a high frequency series resonant transformer with distributed parameters, which can obtain a high frequency voltage of millions of volts.
2, the high-voltage battery pack voltage of Tesla electric vehicles is between 400 volts and 800 volts.
3, the drawing you get is not a Tesla coil, it should be CCPS. This is a simple resonant switching power supply, the output plus voltage doubling rectification, onlyThat's all. This thing has nothing to do with Tesla coils, but it can be used as a power source for Tesla coils. High pressure pack can also be used, but it is best not to use, too much power will explode the bag. It is recommended not to play the power of a single high voltage pack to more than 500W, otherwise it is dangerous.
4, the high voltage pack is equivalent to a high frequency booster transformer, we generally use the electrical frequency can not reach, or DC, can not drive the high voltage pack, so we use mos tube self-excited high frequency AC drive high voltage pack. The output of the high voltage pack charges the high voltage capacitor, and at the primary discharge point of the Tesla coil, the secondary will produce an ultra-high voltage arc.
5, Tesla coil production tutorial as follows: material enameled wire: diameter 0.2-0.3 can be, half a kilogram or so, depending on the size of the secondary coil, the electronic market can buy the price of 20-30 yuan.
2, STC89C58 is a new 51-core MCU, it contains 32KFLASH ROM, 2KRAM, with ultra-low power consumption, the typical power consumption in normal working mode is 4 ~ 7mA, idle mode is less than 2mA. STC89C58 has strong anti-interference ability compared with the traditional 5l microcontroller, each I/O port is VCC and GND is stc wireless charge diode clamp protection, so the input voltage range is wide, not afraid of power jitter.
3, STC 51 MCU price ratio is still normal, the quality is basically worthy of the price. Downloading trouble is common for STC chips. Generally, the following solutions can be considered: reduce the baud rate, and try to disconnect the power cord to disconnect the ground wire. The permission Settings of the document are very disgusting, and it is not the so-called well-known factory. But it seems that Macro only restricts Chinese people to download English documents.
4TC series microcontroller is a microcontroller product produced by Shenzhen Hongjing Company. stc MCU advantages: strong anti-interference ability stc wireless charging ; strong security performance, difficult to crack stc wireless charging ; Single-chip clock has the function of preventing external electromagnetic radiation stc wireless charging ; stc microcontroller disadvantages: high power consumption, 5V power supply; 8-bit, slow running speed; No hardware multiplier, multiplication and division operations are 4-cycle instructions; There are few integrated resources in MCU.