6.Arduino learning notebook--Digital Tube Experiment


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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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6. The design of PCB-- related skills

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9. PCB design related skills   Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  PCB design setting technique The PCB design needs to be set different points  in different stages. In the layout phase, the device layout can be used in the large lattice point . For large devices such as IC and non-locating connectors, the lattice site of 50~100mil can be selected for layout, and the grid point of 25mil can be used for the distribution of passive devices such as resistance capacitance and inductance.  The precision of the large lattice point  is beneficial to the orderliness  and beauty of components. PCB layout rules 1. In general , all components shall be decorated on the same side of the  boards, only the top-level element too close, set  some highly limited and calorific value small devices o n the bottom., such as SMD resistor, SMD...
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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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