Abstract
In order to use the soldering iron If continuous usage is not left idle for a long period, it would be great, but in practice we will use for a short time is compared with the actual usage to plug the freezer is over. Without it, there are many disadvantages, for example, will cause the service life of the soldering iron gut. The accumulated heat will make when soldering to make Princess pattern damage, etc. That can solve the problem above has to reduce the disadvantages that arise at all research has studied the properties of soldering iron. Control principle of Zero crossing, and sky is the theory about microcontroller and others. Then you have to. Designing a control operation of the soldering iron by the circuit design, the programming device to control and testing the working of the machine controls the operation of the soldering iron. Able to work according to the scope of the project and objectives in all respects and be able to apply it effectively
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