Little Star+ LED

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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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ESP8266

As always, in order to try a new method I must decide on a new project which will encourage me to deal the new method with enthusiasm. The project I decided to build was a new code for the  Water heater project  posted here a while ago. Reviewing the old post, I found its code more or less a "proof-of-concept" code, where the emphasis was on the hardware. The project description in a few bullets: The ESP8266 connects to my router via WiFi and serve as a web-client. A website consists of a manageable SQL database with the schedule of the water heater with a main page for the user. The user can add/erase queries from the database. Every 5 minutes the ESP8266 sends a GET request to the the website and receive the minutes left to turn ON/OFF the water heater. That way, even if the WiFi fails at some point the ESP8266 will still have the most updated schedule from the website. While sending the GET request, the website saves data of the time of request, the status of the G...
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