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introduce The PCA9685 is a member of the latest Fast Mode Plus (Fm+) family. Fm+ devices can provide higher frequencies (up to 1MHz) and densely populated bus operation (up to 4000pF). The OE pin m...[Details]
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Introduction The home ECG and blood pressure monitoring system consists of a data acquisition and recording device and a host computer electronic medical record management system. Therefore, the ...[Details]
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In the flow meter measurement in industrial production, in addition to the normal fixed pipeline type flow measurement device, there are often some flow measurement requirements that are not suita...[Details]
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1. What is a field strength meter? As the name suggests, a field strength meter is an instrument for measuring field strength. The value of a field strength meter is in μV/m, and it contains a le...[Details]
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Recently, I have met some friends who use pulse power supplies. I found that when they need square wave output, they use full bridge plus transformer, and the secondary directly outputs square wave. I...[Details]
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Constant current drive circuit design: The LED drive circuit based on PT4115 is shown in Figure 1. The circuit can use Atmega8 microcontroller as the controller and set two input interfaces. The in...[Details]
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In recent years, the trend of automobile intelligence and electrification has continued to develop, and automotive electronics have been widely used in various fields of automobiles, from the initial...[Details]
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MCU C language tutorial - operators and expressions
Types, priorities and associativity of operators
The large number of operators and expressions in C language is rare in high-level languages. It...[Details]
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After studying microcontrollers for so long, I feel that if I want to go deeper, I have to learn assembly language, or at least understand the internal structure of the microcontroller. Below, I wi...[Details]
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The continued push for wearables is transforming individuals into their own data centers, including flash drives, mobile PCs, sensor arrays, medical devices, and more. Various technologies compete ...[Details]
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Temperature transducer, using the law of the change of various physical properties of materials with temperature to convert temperature into a usable output signal. Temperature sensor is the core par...[Details]
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Summary of each mode register in ARM state All 37 registers are divided into two categories: 31 general-purpose 32-bit registers (actually all corresponding physical registers) 6 status register...[Details]
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Open the serial interrupt at the corresponding position in the main program (the instruction is SETB ES), set the baud rate, start the corresponding timer (because the baud rate is generate...[Details]
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LED display refers to LED digital tubes, LED dot matrix displays, etc., which are composed of light-emitting diodes. There are two commonly used types of LED light-emitting devices: digital tubes a...[Details]
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The operational amplifier is a typical analog integrated circuit. It can be said that the existence of the operational amplifier is the beginning of the analog integrated circuit, and its history is ...[Details]
DSP and ARM Processors
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