Little Star+ LED

Little Star + LED, do you love it?

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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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3.The design of PCB---General principles

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5. General principles of PCB design Juvtmall  ( a company supply  PCB Prototyping ,  PCBA service  and sell kinds of  components, modules  and so on)  The  special components layout First, consider the size of PCB: when the size of PCB is too large, the printing line is long, the impedance increases, the anti-noise ability decreases, and the cost increases  too  small,  so  the heat dissipation is not good, and adjacent lines are easily disturbed.   After determining the PCB size,  make sure  the location of the special components.   Finally, l ay  out.the entire components of the circuit   according to the function unit of the circuit . The following principles shall be observed in determining the location of special components: A. To minimize the connection between high frequency components, try to reduce their distribution parameters and electromagnetic interference between th...
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3. Arduino Learning notebook -- Make the first circuit: blinking the single LED

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3.  Arduino Learning notebook -- Make the first circuit: blinking the single LED               Juvtmall  ( a company supply PCB Prototyping , PCBA service  and sell kinds of components, modules  and so on) Before making any circuit, be sure to understand the parameters of the original in the circuit, its working voltage, working current and so on. LED’s working voltage is generally 1.5-2.0 V, the working current is generally 10-20mA, and the reverse breakdown voltage is 5V. The control board logic circuit power supply is 5V. According to the above parameters assumption LED choose 1.7 working voltage, working current choose 15 mA, current-limiting  resistance =( total voltage - LED voltage)/current, so the current-limiting  resistance = (5-1.7) / 0.015 = 220 Ω. First, you need to download the compiled software from the arduino's official website, the address is...
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