Programmer Think

4.10 use the counter to measure the pulse frequency of NE555 4.10. 1 Introduction to schematic diagram Figure 4-10-1   Figure 4-10-2 4.10. 2 introduction of counter mode of single chip microcomputer Two 16 bit timers / counters t0 and T1 set inside STC90C51RC/RD + series single chip microcomputer have two working modes: counting mode an ...

working principle: If you want to look at the code directly, you can skip the principle, turn down directly, and then the code at the end AS608 mainly communicates through serial port 1. Buffer and fingerprint database The system is equipped with a 72K byte image buffer and two 512 bytes feature file buffers, named ImageBuffer, CharBuffer1 and ...

4, 💙💙 ☛ electronic ringer based on STM32 √★☆ 💙💙 Introduction As a tool, the answerer has been widely used in various intelligence and knowledge contest occasions. However, the frequency of use of answering devices is low, and some of them are either complicated to make or have low reliability. As a unit, if you buy a responde ...

1, Principle of SD card protocol 1. Physical structure of SD card General SD card includes five parts: storage unit, storage unit interface, power detection, card, interface controller and interface driver. The storage unit is a storage data component, and the storage unit transmits data with the card control unit through the storage unit ...

preface This paper teaches you to use the external interrupt, connect the key to the IO port, and use the interrupt to control the internal program of the single chip microcomputer. Equipment used: STM32F407 1, Introduction to STM32F4 external interrupt Each io of STM32F4 can be used as an interrupt input port for external interrupt. STM ...

1, Memory allocation of C program stack area It is automatically allocated and released by the compiler to store the parameter values of functions and the values of local variables. Its operation is similar to the stack in the data structure.heap Generally, it is allocated and released by the programmer. If the programmer does not release ...

preface Use tools Final effect and connection code KEIL document overview critical code oled. IIC pin definition in H display string Display number display string Display Chinese characters Show BMP picture Use of mold taking software Software settings Dynamic graph implementation preface Use tools Punctual atom STM32F103RCTb ...

I. principle of PID algorithm In industrial applications, PID and its derivative algorithms are one of the most widely used algorithms and are well deserved universal algorithms. If you can skillfully master the design and implementation process of PID algorithm, it should be enough for ordinary R & D personnel to deal with general R & ...

STM32 serial port data transceiver foundation - blocking and non blocking application understanding [HAL version] Send data to serial port Blocking transmission (recommended) Features: the program command sending service starts sending, and will accompany the sending service until all bytes are sent at one time. Or the timeout limit is rea ...

Requirements: Master the principle of SD card protocol, complete the data reading of SD card with STM32F103 (FAT file mode) 1. SD card and FATS 1. SD card (1) Introduction SD card (Secure Digital Memory Card) is very common in our life. Controllers usually have two communication interfaces to read and write SD card, one is SPI interfac ...