Techyard - Backyard of Tech - All stuff about Electronics, Microcontrollers, Opensource and Projects » Default http://techyard.info/blog Techyard - Backyard of Tech - All Things about Electronics, Microcontrollers, Opensource and Projects Thu, 21 Apr 2011 14:11:30 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 How to Charge a Battery and Switch Power Supply from Adapter to Battery http://techyard.info/blog/2011/03/how-to-charge-a-battery-and-switch-power-supply-from-adapter-to-battery/ http://techyard.info/blog/2011/03/how-to-charge-a-battery-and-switch-power-supply-from-adapter-to-battery/#comments Mon, 28 Mar 2011 13:26:18 +0000 Chenxiang Hsu http://techyard.info/blog/?p=159 Recently I've designed a system that use a battery as a backup power.  It can shutdown the power supply by software.  And also automatically switch power supply from adapter to internal battery.

so here is the circuit diagram.

Power Switch Circuit

]]> http://techyard.info/blog/2011/03/how-to-charge-a-battery-and-switch-power-supply-from-adapter-to-battery/feed/ 0 STM32 Multiple USART Driver http://techyard.info/blog/2010/07/code-stm32-multiple-usart-driver/ http://techyard.info/blog/2010/07/code-stm32-multiple-usart-driver/#comments Wed, 07 Jul 2010 17:40:40 +0000 Chenxiang Hsu http://techyard.info/blog/2010/07/code-stm32-multiple-usart-driver/ Recently, I am developing a small project which utilize many many uart device. The core controller chip is a STM32 Cortex-M3 Chip which has 5 UARTS.  In order to make full use of these UART interface, I just customized a small USART Driver which can make full control of 5 UARTS.

Due to STM32’s restrictions , only UART1 to UART 4 has the ability of DMA Write, so

]]> http://techyard.info/blog/2010/07/code-stm32-multiple-usart-driver/feed/ 0 EDN Design Ideas – Download Them All from 1999 to 2009 http://techyard.info/blog/2010/06/edn-design-ideas-where-is-the-new-ideas/ http://techyard.info/blog/2010/06/edn-design-ideas-where-is-the-new-ideas/#comments Tue, 01 Jun 2010 22:46:44 +0000 Chenxiang Hsu http://techyard.info/blog/2010/06/edn-design-ideas-where-is-the-new-ideas/ Recently, My favourite magazine EDN have changed their website style. But it caused many problem. Now I cannot find new design ideas from the website.  So I just make a google , it tell me that they just hidden the design ideas to magazine issue page. here is the link.

But for your convience, I uploaded all design ideas from Year 1999 to Year 2009, 11 years in all.  You can download them all

[Link]1999-2009.7z

]]> http://techyard.info/blog/2010/06/edn-design-ideas-where-is-the-new-ideas/feed/ 0 Very First Post of My Very First Blog http://techyard.info/blog/2009/12/very-first-post/ http://techyard.info/blog/2009/12/very-first-post/#comments Wed, 16 Dec 2009 13:58:00 +0000 Chenxiang Hsu http://techyard.info/blog/?p=1 Hi, everybody. This is a blog site which mainly focus on the Technical stuff ranges from electronics design example, principle behind a circuit , how to program, and so on.

My Name is Chenxiang Hsu. And I am an electronics designer which work in a small company dealing with hardware design job.  If you wanna to talk with me, just write a email to me

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