Interface circuit design of face recognition attendance machine

Face communication attendance machine is the world’s first embedded face recognition machine, with a false recognition rate of less than 1 / 100000 and a rejection rate of less than 1%. In the field of biometrics, it can be said that it is quite accurate. It is an offline version. It can be used without […]

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How to prevent MCU from being cracked by malicious attack technology

1 Introduction Microcontroller generally has internal ROM / EEPROM / flash for users to store programs. In order to prevent unauthorized access to or copy the internal program of MCU, most MCU are equipped with encryption lock positioning or encryption bytes to protect the on-chip program. If the encryption lock positioning is enabled (locked) during […]

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Working principle analysis of PWM in single chip microcomputer

PWM is widely used in single chip microcomputer. Its basic principle is very simple, but it often applies to different occasions, and the meaning is not exactly the same. Here, I will first introduce the basic concepts and basic principles to you, and at least know what it is when it is used later. PWM […]

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Design of digital sensor circuit module for sEMG signal

SEMG signal is a one-dimensional voltage time series signal obtained by the bioelectrical changes of neuromuscular system during random and non random activities guided, amplified, displayed and recorded by surface electrode, and its amplitude is about 0-5000 μ 5. The frequency is 0-1000hz, and the signal shape has strong randomness and instability. Compared with traditional […]

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Comparative analysis of software and hardware between SCM and arm

1. Software 1) Convenient. It is mainly reflected in the later development, that is, the application program is directly developed on the operating system. Unlike MCU, everything has to be rewritten. The early stage of the operating system transplantation work, or to professionals to do. 2) Safety. This is a feature of Linux. The kernel […]

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Circuit design of fingerprint identification system based on single chip microcomputer

  Fingerprint identification system circuit   working principle:When the fingerprint sensor receives the fingerprint information, it will send commands to the MCU through the serial port, and the MCU agrees and receives the corresponding information. The fingerprint collected by the fingerprint sensor is converted into RGB format, and the data is transmitted to the MCU. The MCU […]

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