The principle of single chip microcomputer control relay

As an old industrial city, there are not many enterprises in embedded development and design of single chip computer in Zigong. Here we introduce the principle of single chip computer controlling relay. First, we look at the typical relay driving circuit diagram of relay. Such a diagram can be found everywhere on the network, and the circuit diagram of single chip computer in standard textbooks is generally a weak relay device. Most of them work at 5V or even lower. The driving current is below the mA level. It is obviously not feasible to use it in some high-power situations, such as controlling the motor. Therefore, there must be a link to link up, this link is just the same.