I would like to ask you guys, if you use an ultrasonic sensor to measure an object within a range of 30-50mm, what is the frequency of the emission?...
[i=s]This post was last edited by yuanlai2010 on 2014-8-3 10:34[/i] [align=center][b][font=华文楷体][size=15.0pt][color=#4169e1]Linuxprograming [/color][/size][/font][/b][b][font=华文楷体][size=15.0pt][color=...
Due to logistics and the epidemic, the development board has been received for a while. I will continue to evaluate it when I have time. E840-DTU (EC04) is a new generation of high-performance 4G DTU ...
After receiving the express, I opened it and checked it immediately. The outer packaging was fine, but the inner packaging was the standard packaging of the STM development board. However, this develo...
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introduction
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