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. PCB design considerations   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  (1) avoid setting important signal lines on the edge of PCB, such as clock and reset signal. (2) the distance between the ground wire of the enclosure and the signal line is at least 4mm; keep the length and width of the ground wire to be less than 5:1 to reduce the inductance effect. (3) lock the device and line that identified location with LOCK function, so that they will not be misused. (4) the width of the conductor should not be less than 0.2mm (8mil). In high-density and high-precision printed circuit, the width and spacing of the wires are generally preferable to 12mil. (5) Routing in the IC pin of DIP package, 10-10 and 12-12 principles can be applied, as between the two pins by 2 lines, diameter of bonding pad  can be set to 50 mil, width and spacing of line is 10 mil, when o...

2. Connect the Raspberry Pi to computer        Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  Connect your computer and Raspberry Pi to the rooter, let them share the net, for easily find your Raspberry Pi’s IP, you can download the following software into computer: Advanced IP Scanner: http://www.advanced-ip-scanner.com/index3.php?utm_expid=62919999-52.ZgzGnMMDQ7KosMzu7DlCQA.2&utm_referrer=http%3A%2F%2Fwww.advanced-ip-scanner.com%2Fcn%2F If your root has connected many terminal, you can try the software, start the software click the start option, wait a minute, you can find a manufacturer which named Raspberry Pi Foundation, then find the corresponding IP, it’s the host name of Raspberry Pi, open XShell, input the host name at “1”   Raspberry Pi’s name is  pi , password is  raspberry . Then you can input command to your Raspber...

4. Arduino Learning notebook -- Make the first circuit: Blink single LED  (VOL.1)               Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on) (  Catduino  has the same function of Arduino) In the previous  experiment , we learned how to make an  LED  to blink, and the following experiment would control six  LEDs. [ code ]  //set IO pin as controlling the LED i nt Led1 = 1; i nt Led2 = 2; int Led3 = 3; i nt Led4 = 4; int Led5 = 5; int Led6 = 6;  // Led display  style 1  sub program void style_1(void) {   unsigned char j;   for(j=1;j<=6;j++)   {     digitalWrite(j,   HIGH);     dela...

How does the eight tails cat become nine tails cat in the end? For more details, you can click here: www.juvtmall.com The other blog

It is said that there is a kind of cat that can reach the heaven to become the god as long as nine tails. Every practice to one stage will have one more tail, but it is very difficult to success. When the cat uniting to eight tails, it will get a prompt to help its owner to achieve a wish, after the completion of wish, it will grow a new tail as well as fall off a tail. It is still eight tails. It seems like a strange cycle, that is to say it's impossible to build a nine tail anyway. A very devout cat, has been practicing for hundreds of years and helping many people realize the desire, but still eight tails. One day, it met a boy be trapped by wolves, by its nature, quickly drove the wolves and saved the boy, then found the youth is the first master's offspring. According to the rules, it needs to help the boy realize a wish. The cat asked the boy what his wish was, and he could not answer it for a moment. The day passed and the boy still didn't make a wish. The ...