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Calculation formula of capacitance charge and discharge timeV0 is the initial voltage value on the capacitor;The V1 is the voltage value that the capacitance can eventually be charged to or put on;The Vt is the voltage value on the T-moment capacitor.TheVt= "V0" + (v1-v0) * [1-exp (-T/RC)]Ort = rc*ln[(v1-v0)/(V1-VT)]For example, a battery with a voltage of E is charged by R to a capacitance C with an initial value of 0V0=0,v1=e, the voltage charged to the T-moment capacitor is:vt= "E" *[1-exp (-

Knowledge of dry contacts and wet contactsPopular definition : There is a dry contact with a wet contact, for the switching volume. the definition of wet contact is : active switch, has 2 kinds of state with electricity and no electricity, 2 contacts have polarity, can not reverse connection;Common Wet contacts1, if the above dry contact signal, connected to the power supply, and then another pole of the power supply, as the output, is the wet contact signal; Industrial control, commonly used we

In new mixed-voltage systems, it's often necessary to level-shift a control signal from a high level to a low level. An open-drain device, such as the 74lvc1g07, and easily performs this shift. However, when a bidirectional signal requires level-shifting, it takes a bit more circuitry, because simply tying open -drain devices pins together generates just a latch function.the circuit infigure 1shows How to connect the 74lvc2g241 and 74lvc2g07 devices togethe R to shift the signal at a-a from-a hi

One of the first experiments to do is about the LED, is the output of the IO port use , this section of the experiment is the use of independent keys, that is, IO port input useThe Ministm32 Development Board has a total of 3 independent keys, respectively, the KEY0 KEY1 wk_up schematic diagram is as follows:Note: The KEY0 KEY1 is active low (that is, they are low for the button press) and the WK_UP is high active, why? Obviously, this problem to analyze the above schematic diagram to know, well

What is TTL level, what is CMOS level, their difference(1) TTL High Level 3.6 ~ 5 V, low 0 V ~ 2.4 VCMOS-level VCC can reach 12 VThe output height of the CMOS circuit is about 0.9vcc, while that of the output low is about0.1vcc.The input that is not used by the CMOS circuit cannot be left blank, which may cause logical confusion.The input end not used by the TTL circuit is suspended as a high levelIn addition, the power supply voltage of the CMOS inte

the ESP8266 is as follows:The port to use is TX,RX,CH_PD,VCC,GNDTx,rx the rx,tx of the USB to TTL interface respectively,CH_PD,VCC 3.3v (remember must be 3.3v)GND groundingConnecting the Internet of ThingsOpen the Serial debugging assistant, search the serial port, set the baud rate to 115200, and then unplug the ESP8266 VCC pin on the plug, will return a string

(Multi-connection), cannot be set to cipmode=1 (pass through)Cipmux=0 (single connection), cannot set cipmode=0 (cannot pass through)You can only open the server when you are Cipmux=1 Software Design: Is the first to install ESP01 firmware, modify a good Android phone control software, you can control the ESP01 3 io, GPIO0, GPIO2, TX. (Note The default is high), through the mobile phone side control level, to achieve the control of the USB switch. Wiring when brushing the firmware:8266 Module U

high-level, the output of the powerThe flow will be the lower door from the power supply through the VT3 pull-out. In this way, the output high and low, VT3 and VT5 all the way willAlternating operation, which reduces power consumption and increases the capacity of each tube. And because no matter where you go, the pipe on resistanceare very small, so that the RC constant is small and the transition is fast. Therefore, the push-pull output stage improves the load capacity of the circuit andHigh

Did not study carefully, the use of the next, summed up the point, also searched a bit of information. --------------------------------------------------------------------------------------------------------------- ------------- Simple to speak: (UART and COM) Embedded inside said serial port, generally refers to the UART port, but we often do not know it and COM port differences, as well as RS232, TTL and other relationships, in fact, uart,com refers to the physical interface form (hardware), a

, operator, administrator. Different permissions have different permissions, specifically as follows:A, the general user can realize the function isA, check the balance of the student card, check the student's basic information and show the balance through the card number query.b, check on the machine record, through the card number on the machine record, name, up and down the date and time, consumption amount, export execl form.c, check the recharge record, through the card number query recharg

personnel Reference: Many people have encountered the request for data recovery customers, but they do not have a clear method, the following case on the U disk (USB) data recovery of the specific methods to explain: Case one: There is a customer request for the U disk data recovery capacity of 256m, the customer to get the U disk access to the computer without any reflection! Because the internal engineering of the CAD drawing is very important 1, open u disk (USB) is packaged as a whole, cu

. Flexibility This module output PWM dimming signal, maximum output current 10mA, dimming range of 0~100% (adjustable), can adapt to all kinds of pwm/analog dimming interface driver chip, design more flexible. 5, can be customized to meet the special needs of customers, you can customize the corresponding module. Third, electrical characteristics Pin Identity Description Electrical parameters Pin1/2 DA Dali Input Pins dali:dc+9.5~22.5v (interface current PIN3 Vss Power supply to enter PIN Powe

duty ratio is 0.48 6. Calculate peak current for primary inductor ip=2po/(dmax*vinmin*η)The peak current of the primary inductor is 1.818A 7. Calculating the RMS value of primary winding current Irms=ip*√ (DMAX/3) =0.727a 8. Calculate the inductance of primary winding lp=vinmin*dmax/(IP*F)Calculate the primary inductance 450μh 9. Maximum on-time tonmax=dmax/fCalculation of the available time is 7.4us 10. Calculation of primary turns np=vin*tonmax/(AE*BM)Calculates the number of primary turns th

http://bbs.21ic.com/forum.php?mod=viewthreadtid=679682page=1#pid3911906 Pic does not have a programmatic reset, and the probability that you can get into the programming state is very small, and the probability that you are present is very high, which means it is not caused by this problem.In fact, the ESD reset is basically affected by the reset of VCC and MCLR, such as when you test for an IO port, because the pic IO port has a

has been using ULINK2, a few days ago encountered a board, can only use the SWD debugging interface, so make a record. Open ULINK2, find Arm (20p,2.54mm) interface, connect the target board SWD and ULINK2 with DuPont Line. SWD, use 5 wires: GND\VCC\RST\SWDIO\SWCLK. The Swdio also has the function of data input and data output. The wiring is as follows: SWD ULINK2 's Arm interface GND---------GND (4,6,8,10,12,1 4,16,18,20 feet) Swdio (serial data input

, that is, the seamless switch can be achieved through internet control, facilitating operations. We can directly set the status to coexist in two modes for convenience. Shows the ESP8266 interface: The required ports are TX, RX, CH_PD, VCC, And GND. TX and RX are connected to the RX, TX, and, CH_PD, VCC connected to 3.3 v (it must be 3.3 v) GND grounding Connect to IOT Open the serial port debugging assis

control part establishes an end-to-end virtual circuit by transmitting the signaling cells of both sending and receiving sides before the communication is established. After the virtual circuit is established, the ATM adopts two-level routing mode, that is, the ATM virtual circuit consists of virtual channel VP and virtual channel VC. For the ATM Backbone Network, there may be thousands of vcpus entering the switch. If each VC is connected to VCC, ma

Http://zhidao.baidu.com/link?url=DW5c3ozc4FLxbEMuaYWWTKXYZFvMQP9Jj2MCggqO0ifgK9sRWZL42azUPjMGwvWNDIg2ZUis4ueUCJrspgC79qThe potential of a point is related to the reference point, and the voltage (the potential difference of two points is independent of the reference point), at a point where the voltage of the 2 point is determined, the potential of one spot is raised and the potential of the other point is raised automatically. This is like standing on the shoulders of giants is a truth.The feat

Debug imx6 SPI Slave kernel driver, pre-commissioning always have to catch up with the Register settings, procedure function calls.The PRINTK () print statement is used.1, the use of hardware methods are:Each pin of the analysis imx6 SPI slave is mainly CLK, CS, Mosi, miso, GND, VCC, connected to the SPI Master (cc1110f32 MCU)The corresponding pins of each road. Corresponds to the following: imx6 SPI Slave Machine CC1110F32 SPI Ho

I. Definitions and distinctionsBypass (bypass) Capacitor: the high frequency component of the input signal is used as the filter object;Decoupling (decoupling) capacitance: Also known as decoupling capacitance, is the output signal interference as the filter object.The decoupling capacitor and the bypass capacitor are all anti-jamming, the capacitance is in different positions, the name is not the same.High-frequency bypass capacitance is generally relatively small, according to the resonant fre