#The 7th Lichuang Electric Competition# "Mass production" handheld fan

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* 1. Introduction to project functions
Summer is the hottest time of the year. As the temperature gradually rises, various cooling devices are frequently used. Among them, the handheld fan, which is a must-have when going out, is the protagonist of this project.
This handheld fan uses N32G430 as the main control. The fan battery part adds power protection, which greatly extends the service life of the device battery. The most important fan function has four-level speed regulation. Each time you press the button to switch to a different speed gear, the function cycle will be performed between 25%, 50%, 75%, 100%, and off after pressing the button.
A simple handheld fan solves the problem of cooling when going out.
 
*2. Commercial attributes
Does a simple fan have commercial value? The answer is yes. Searching for the keyword "handheld fan" on any e-commerce platform will show fans of various prices. There is definitely a difference. I will not explain the difference between different prices here, but only focus on the core function-the fan.
The homepage uses the existing 3D model to make the shell, and then makes it into a standard mold for mass production. The cost of the shell is greatly reduced. Secondly, the cost of the parts is really low once it is mass-produced. If the project is directly mass-produced and put on the market for sale, the answer is feasible. The specific implementation process and steps are relatively complicated. For example, product operation will be a headache.
Back to the keyword "mass production" written in the title, in fact, no matter how diversified the price of handheld fans on the market is, it is inseparable from the core function, which is the fan. Secondly, the product optimizes the motor and optimizes the power management to enable it to have a good user experience, and at the same time, the product is branded and packaged, that is, the product market is opened.
In terms of cost, the core function is simple, the cost is low, and the production is relatively easy. A large number of products can be produced in a short time during mass production, and the profit margin between the production cost and the market price is considerable.
Of course, many people will wonder how a simple handheld fan can be involved in business. In fact, it is often this kind of inconspicuous product in life, but its value is huge. Searching for "handheld electric fan" on major e-commerce platforms to see products of different prices and brands is a good proof.
* 3. Open Source Agreement
Back to the keyword "mass production" written in the title, this project adopts the GPL agreement for open source, that is, only the original author's information needs to be retained, and other contents can be modified without restriction, including secondary distribution and commercial behavior, which are all allowed by the GPL agreement, but the rules of retaining the original source and the original author need to be followed.
* 4. The real LOGO of the LiChuang Electronic Design Competition on the back of the motherboard
Note: The project is a real project. It took me half an hour of hard work and a total of 1,800 seconds to come up with this painstaking work! ! But all the contents of the [commercial attributes] in the second part are purely fantasy and bragging. If you feel that you haven't seen enough, please come to the comment area and I will brag a little more. If you believe it, just treat me as if I said nothing~
 
Some people may find it strange that they don't see the crystal oscillator. Anyone who has this question can check the 2.4 part of the document provided on the N32G430 sales page of LiChuang Mall. In fact, the old hands who have played with STM32 or even participated in the previous CW32 know, take care of your younger brother DDDD