我所采用的控制芯片为P89V51，此芯片功能强大，能够满足设计要求。通过对电路的设计，对芯片的外围扩展，来达到对热水器水温和水位的控制和调节功能 -I used control chip P89V51, this chip powerful, able to meet the design requirements. On circuit design, chip peripheral expansion, to achiev