Video come from a Chinese folk !!!

How does the eight tails cat become nine tails cat in the end?
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BMP 180, worthy to get it.

This is the link of BMP180 !  http://juvtmall.com/bmp180-module_p0721.html BMP180 (End of lifetime) Not recommended for new design-ins The BMP180 is the new digital barometric pressure sensor, with a very high performance, which enables applications in advanced mobile devices, such as smartphones, tablet PCs and sports devices. It follows the BMP085 and brings many improvements, like the smaller size and the expansion of digital interfaces. The ultra-low power consumption down to 3 μA makes the BMP180 the leader in power saving for your mobile devices. BMP180 is also distinguished by its very stable behavior (performance) with regard to the independency of the supply voltage. Applications - Indoor navigation - GPS-enhancement for dead-reckoning, slope detection, etc. - Sport devices, e.g. altitude profile - Weather forecast - Vertical velocity indication (rise/sink speed) Wearables A wristband personal alarm clock will make sure that not ...
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1. Arduino learning notebook -- Button experience (VOL. 1)

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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 low level. ...
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1. The design of PCB--- brief introduction and design steps

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1.The design of PCB                         Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  In PCB design, the layout of the components and the wiring of the circuit are the two key links. Layout,  means  the circuit device in the printed circuit board wiring area. Whether the layout is reasonable not only affects the wiring work at the back, but also has an important effect on the performance of the whole circuit board. After guarantee ing  the circuit function and performance index, to satisfy the requirement of process, testing and maintenance aspects, components should be uniform, neat  and compact   on the PCB, as far as possible to reduce and shorten the lead and the connection between components, in order to get  symmetrical   packing density . The position of ea...
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