程序是关于12V铅酸蓄电池充电器的。充电方式选择的是普通的三段式，PI调节用硬件实现（其实用软件实现比较好，只是毕业在即时间不够了）。程序主要是判断电池的正反接和充电状态，以便实现三段的切换。对充电器有兴趣的朋友可以参考一下（程序写得不是很标准，将就着看吧）。-Program is on the 12V lead-acid battery charger. Charging an ordinary three-stage selection, PI regulator with the hardware (in fact, better use of software, just not enough time to graduate soon). Program is mainly connected to judge the positive and negative battery and charging state, in order to achieve three paragraphs of switching. Interested friends on the charger for reference (written in not very standard procedure, will the Kanba).