Self made infrared TV remote controller with AT89S52

When the infrared remote controller sends data, it modulates the binary data into a series of pulse signals, which are transmitted by the infrared transmitting tube. The infrared carrier is a square wave with a frequency of 38kHz. When the infrared receiving end receives the 38kHz carrier signal, it will output a low level, otherwise […]

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Design diagram of driving circuit of two-phase stepping motor

This paper introduces the design schemes of unipolar and bipolar driving circuits most commonly used in byg general series two-phase stepping motors, embodies the control method of two-phase stepping motors in principle, and increases the flexibility of driving circuit design of stepping motors. The unipolar and bipolar driving circuits of two-phase stepping motor adopt an […]

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Pin description of AT89S52 single chip microcomputer

AT89S52 single chip microcomputer performance description: Pin description: Port P0: Port P0 is a bidirectional I / O port with 8-bit drain open circuit. As an output port, each can drive 8 TTL logic levels. When writing “1” to port P0, the pin is used as high impedance input. When accessing external programs and data […]

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