"Exhaust Fan" Debug Note: 1, when a chip to a chip debugging checks in the past so you can reduce the experimental procedure. 2. Do not chip debugging weight, prevent broken chips. Although the timing of the exhaust fan is very simple, but he has practical significance, because of him that we can not have every day, guarding closed, it will not only liberate people, but also to energy saving, environmental protection played a role. Although the timing of the exhaust fan is good, but because of the expensive material can not be universal, and the exhaust fan to be powered for this deficiency, we need to make cheaper, but also more environmentally friendly use of solar energy or energy.