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2.  Method of wiring on multiple layers PCB       Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)     Generally, four layers board can be divide into top layer, bottom layer and two internal layer. Internal layer: by command “DESIGN/LAYER STACK MANAGER” use “ADD PLANE” add “INTERNAL PLANE1” and “INTERNAL PLANE2” as VCC and GND in power and GND layer (tip: don’t use “ADD LAYER”, it will add MIDPLAYER, it’s used in multiple layer of signal track), if there are several power layer such as VCC2 or GND layer such as GND2, then use bolder wire or FILL to draw a district on power of GND belongs to PLANE1 or PLANE2,  use PLACE/SPLIT PLANE to make a corresponding district (VCC2 copper and GND2 copper flakes are not present in this area in the same PLANE) tip: different surface layers in the same PLANE and try not to overlap.SPLIT1 and SPLIT2 are overlappe...

4.Set static IP   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  You may say: no, though I can use Wi-Fi and don’t need network cable, I still have to use Advanced IP Scanner to search IP of my Raspberry Pi, it’s so inconvenient. I will teach you how to set static IP First: input the following command: sudo nano /etc/dhcpcd.conf Secondly: input these command to the bottom line:              interface eth0 static ip_address=       (the static IP you want) static routers=          (your routers) static domain_name_servers=     (domain) Tip : this is the way to set eth’s static IP The following is about how to set wireless static IP: Input the command: interface wlan0 static ip_addres...

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...

1. Arduino learning notebook -- Button experience               www.juvtamll.com    ( a company supply PCB Prototyping, PCBA service, sell modules.) The button is a commonly used key, normally used to connect or disconnect the circuit, so as to control the the motor or other equipment. The buttons have a variety of appearance. This experiment is used for this kind of miniature keypad, 6mm, as shown below. Look at the back of the button, it has 4 pins. When the button not be pushed, No. 1 and 2 are connected, 3 and 4 are connected. When the button is pressed down, all the pins will be connected. We use button to control the led. The general situation is install the button series in the led circuit, however, it’s too simple. We use the indirect way, the button judge output voltage from the circuit. If the voltage is greater than 4.88 V, output high level to the LED circuit, whereas output lo...