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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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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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2. Arduino learning notebook -- What's Arduino? (VOL. 1)

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2. Arduino learning notebook -- What is Arduino? (VOL. 1)         Juvtmall (a company supply PCB Prototyping, PCBA service, sell module and so on)   If you want to understand arduino, it’s needed to know what a single chip machine is. Because the arduino platform is based on single chip of the AVR instruction set. 1. What is a MCU? What are the differences between MCU and COMPUTER? A computer includes five parts: CPU(operation 、 control) 、 RAM(digital storage) 、 ROM （ program storage ）、 I/O (serial, parallel output, etc.). These parts are divided into a number of chips on a personal computer(PC), which are united on a printed circuit board(PCB) called mainboard. In SCM, these parts are all united in a piece of integrated   circuit chip, so MCU. There are kinds of single chip machines, beside the above parts, also integrates other parts such as analog/digital conversion (A/D) and digital/analog conversion (D/A), etc. 2、 Wh...
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