How to measure the voltage of the port of the single-chip computer with a universal meter?
When testing the voltage at the port of the single-chip computer with a universal meter, connect the red pen to the port pin of the single-chip computer, connect the black pen to the GND (ground), and then read the voltage displayed by the universal meter. It should be noted that the operating voltage range of different MCUs is different. For example, the normal operating voltage range of the STC89C52RC is 5.5V - 3.4V, and the most commonly used voltage in this range is 5V. If the ATmega single-chip processor was used, it was impossible to measure the resistance between the output high-level IO-to-GND or the output low-level IO-to-vcc-resistance due to the existence of the output static voltage. Read more exciting novels for free
Single chip voltage simulation software
There were some software that could be used to simulate the voltage of the single-chip computer, such as the Simuide, which could not only simulate the circuit but also simulate the AVR single-chip computer. The windows version had the built-in tuning software for the pid single-chip computer. Due to the GPL agreement, the debuggers for the linux-based version needed to be installed. It integrated the Arduino compilation and tuning environment, and the Arduino code could be written and run on it. There were a variety of electronic components in the software that could be freely used. Probes and voltage meters could be added anywhere in the circuit simulation circuit. An ammeter or an earpiece could be used to monitor the voltage and other changes. It could also monitor the memory and register of the single-chip computer. There was also the Proteus software, which was excellent in the simulation of single-chip processors. It supported the simulation of 8051, PAC, and AVR single-chip processors. It could carry out circuit design, circuit board layout and design, circuit simulation parameters analysis, and also support the analysis of various circuit parameters such as voltage. It could also visualize the simulation data through various charts and graphs. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The significance of the design of the electric energy meter based on the single-chip computer
The design of an electric energy meter based on a single-chip computer has many meanings: 1. ** For the improvement of the designer's own ability **: Through thinking and hands-on practice, it can greatly train the designer's self-learning ability, and at the same time improve the knowledge level of the single-chip computer, laying a solid foundation for subsequent related applications. 2. ** Understanding of signal conversion and function realization **: It helps designers to have a clearer understanding of the signal conversion process and function realization. 3. ** Research on the performance of the electric energy meter: It can test the stability of the 89C51 single-chip computer in the application of the electric energy meter, and evaluate the function and superiority of the electric energy meter. 4. ** From the perspective of the development and practical value of the electric energy meter: With the rapid increase in power demand, the electric energy meter is the main tool for measuring electricity. It is extremely important to design an electric energy meter based on a single-chip processor with more functions and higher accuracy to save electricity. This kind of electric energy meter has high precision and accuracy, and has a very good practical development value. It converted the continuous digital data into a non-continuous, scattered digital form and displayed it, combining the results of electronic technology, computing technology, and automated technology with precision electrical measurement technology, breaking the pattern of traditional electronic measuring instruments. The display was clear and intuitive, and the reading was accurate. It adopted advanced digital display technology, which greatly reduced the measurement error caused by human factors. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Development of Single-Chip Computer Scale
The following are the general steps and key points of the development of the single-chip electronic scale: ** 1. Hardwares ** 1. ** Main control chip selection ** - He could choose a more common chip like the 8051 single-chip computer. It had 4KB of internal program memory (Scalable), 128-Byte internal data memory (Scalable), multiple bi-directional parallel input/output ports, and other resources to meet the basic control and data processing needs of the electronic scale. - It also has the advantages of low working voltage, low power consumption, strong driving ability, etc. For example, its I/O port is bi-directional and the output circuit is a complementary push-pull output circuit. The external circuit is simple in driving the digital tube display, and its A/D is 10 bits to meet certain precision requirements. 2. ** Sensing and signal processing ** - The sensor was used to obtain physical quantities such as weight. For example, using a pressure sensor to detect the weight of an object usually required a special signal processing chip, such as the HX711 for processing pressure signals (range 0 - 5kg, accuracy 0.1 g). 3. ** display module ** - The 1602 LCD module was used to display the date, time, weight and other information. It was necessary to connect the single-chip computer to the 1602 liquid crystal, including the connection of the data port and the control port. The software programming was also used to initiate and write data into the 1602 liquid crystal. 4. ** Clock module (option)** - If you need to record time-related information, you can use the DS1302 clock chip. It could provide accurate date and time information for the electronic scale. The microchip needed to communicate with it through the corresponding interface circuit to read and set the time. 5. ** Communication module (option)** - If you want to upload the data to the PC display, you can use the 232 serial communication. The single-chip computer had to set up the serial port, including the configuration of baudrate, data bit, stop bit, and other parameters to achieve stable data transmission with the PC. 6. ** Power Circuit ** - It provided a stable power source for the entire system. It was necessary to design a suitable power supply circuit according to the voltage requirements of the selected chip and other electronic components. For example, a voltage stabilizing chip was used to convert the input voltage to a stable 5V or 3.3V voltage to meet the power supply requirements of the single-chip computer, sensor, display module, etc. ** 2. Software ** 1. ** Selection of programming language ** - If you use the 8051 single-chip computer, you can generally use assembly language or C language for programming. For beginners, C language was relatively easier to understand and write complex program logic. - For the PIC-based single-chip computer, you can also use the C language or its specific programming language, but you should pay attention to the differences between the 8051 single-chip computer and the 8051 single-chip computer in terms of instruction set and register usage. 2. ** Program Function Realization ** - ** Initialize settings **: Initialize the ports, timers, and interrupt of the single-chip computer. For example, set the port connected to the sensor to the input mode and the port connected to the display module to the output mode; Initialize the timer to meet the timing requirements (if there is a timing function requirement); Configure the interrupt (if the interrupt is needed to process the sensor data collection or other events). - ** Data Collection **: Obtain weight and other data from the sensor through programming. If the HX711 was used to process the pressure signal, it was necessary to read the processed pressure data (weight data) from the HX711 according to the communication protocol of the HX711 and convert it into an actual weight value. - ** Data processing **: To process the collected data, such as filtering to reduce errors caused by sensor noise. Simple arithmetic average filtering or other filtering algorithms can be used. - ** Show Function **: Show the processed weight, date, time and other data on the 1602 LCD. This required writing the corresponding display function according to the display specifications of the 1602 liquid crystal, converting the data into a format suitable for display and sending it to the liquid crystal display module. - ** Communication function (option)**: If there is a serial communication function, write a serial communication program to send the data to the PC in the agreed format. This included the packaging and verification of the serial port data to ensure the accuracy of the data transmission. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Simulation circuit diagram of the single-chip computer
The following are several examples of simulation circuits related to single-chip processors: - In the ESP32 and Arduino single-chip simulation (such as the website of the website, the simulation circuit that lights up the LED light needs to add an LED light and a current limiting resistance. The negative pole of the LED lamp was connected to the GND pin of the single-chip development board, the positive pole was connected in series with the current limiting resistance, and the other end of the current limiting resistance was connected to the No. 2 pin of the development board. - For the simulation circuit of the steering gear control, add the steering gear in the hardware circuit (the steering gear has three pins, namely, the voltage regulator, the voltage regulator, and the voltage regulator. The voltage regulator is connected to the negative pole of the power supply, and the voltage regulator is connected to the positive pole of the power supply). Then, connect the steering gear to the single-chip computer (if you use the Arduino single-chip computer, you can choose a pin with a "~" to output the voltage regulator signal. In this project, pin 3 is selected as the voltage regulator output pin). - If the simulation uses L298 to drive the direct current motor, the circuit includes the L298N chip (this is a dedicated driver integrated circuit, belonging to the H bridge integrated circuit), the display part uses the PG 160128A (the liquid crystal display dot matrix is 160X128), the input device is a 4X4 matrix keyboard, and it may also include measurement tools such as a virtual scope. The positive and negative rotation of the motor can be controlled by the P1.0 pin of the single-chip computer. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Single-chip computer c language innovation tutorial
C Language for Single-Chip Microprocessors A single-chip computer was a small electronic device used to control and monitor various devices and systems. The C language was a common programming language used to write programs for single-chip processors. If you want to learn the C language, you first need to understand the basic principles and structure of the microchip. Then you need to learn the basic grammar and programming skills of the C language. Next, you can learn the instruction set and interrupt system of the microchip in order to write programs that can control and monitor the microchip. You can also expand your knowledge by learning about the memory and input and output ports of the single-chip computer. Finally, you can practice writing programs for the single-chip computer and try out different control and monitoring methods. Through practice, you can better understand the use of the C language and improve your programming skills. The single-chip C language innovation tutorial requires the comprehensive use of the basic principles of the single-chip computer, the basic grammar of the C language, the instruction set and interrupt system of the single-chip computer, and the practice of writing single-chip computer programs. Through learning and practice, you can become an excellent program developer and succeed in the electronic field.
How to connect the single-chip experiment box to the computer?
Using the 51 development board as an example, connect the single-chip experiment box to the power supply, use the download cable to connect the single-chip experiment board to the computer, and connect the USB cable to the USB port on the board. This port can not only realize the power supply, but also the program burning function. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Can an 8-bit single-chip computer be used as an electric tool?
Single-chip computers could be used in the industrial field, while electric tools belonged to the industrial category. The 8-bit single-chip computer was a single-chip computer with an internal arithmetic unit that could process 8-bit binaries at a time. It could perform operations such as addition, reduction, multiplication, and division. The internal register was mostly 8-bit, so it could be regarded as a weak micro-computer system. Theoretically, an 8-bit single-chip processor could be used to develop and control functions related to power tools, but the specific application depended on the complexity of the power tool's function development. If the power tool needed to develop a simple function, an 8-bit single-chip processor might meet the demand. If more functions were needed, a single-chip processor with a higher number of digits might be needed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
stm32 single-chip computer USB download program circuit
There were two ways to download the STM32 program. One was based on JTAG (SWD). This method required an simulator (such as J-Link and U-Link) to efficiently and quickly debugged the STM32 single-chip system. The other was based on serial port. The entire STM32 series supported this method. This method could download the HEX file to the STM32 chip through a USB cable and the corresponding ISP download software. In order to download the circuit through the serial port, one must first understand the several boot modes of the STM32. If you want to download the code through the serial port, you need to set BOOT0 to 1 and BOOT1 to 0. If you want the STM32 to run the code as soon as it is reset, you need to set BOOT0 to 0 and BOOT1 to any value. A circuit could be designed to control the one-button download circuit through the serial port to USB chip CH340G's DTL #and RTS#pin signals, thereby indirectly controlling the STM32's RESET and BOOT0 pin signals, achieving the effect of one-button download and operation through the serial port. The serial port download software can choose MCUSP, which can automatically allocate the BOOT0 and RESET signals through the DTL and RTS signals of the serial port. The user does not need to manually switch the state. Open MCUIsp, click Search serial port, and it will automatically find the onboard serial port of the circuit board. Choose the baudrate of 460800 in the bit rate, select the low level reset of DTL in the lower left corner, and then load the burn file into BootLoader at RTS high level. Before the program was written, click to read the device information. If the relevant information appeared, it meant that the serial port connection of the circuit board was successful. Then click to start programming, and the program began to be written. After the program was successfully written, a message indicating that the program was successfully written would appear. The specific process was as follows: mcuisp controls the DTL output to be low, so DTL #output is high. Then RTS is set to high, so RTS#output is low, so Q3 is turned on and BOOT0 is pulled high. At the same time, Q2 will also be turned on, and the reset pin of STM32 will be pulled low to achieve a reset. Then, after a delay of 100ms, mcuisp controls DTL to be at high level, DTL #will output low level, RTS will remain at high level, RTS#will continue to be at low level. At this time, the reset pin of STM32 will become high level because Q2 is no longer connected. STM32 will end the reset, but BOOT0 will still remain at 1, thus entering the SP mode. Then mcuisp can start to connect to STM32 and download the code, thus realizing one-click download. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to control the 24V motor and start it with a single chip computer
For a 24V motor with a high current, it could generally be controlled by a MOS tube or an IGBT. Relatively speaking, an mos was a more economical and practical choice. You can use a single-chip computer to build an H-bridge drive circuit to drive a 24V brush motor. First, draw the H-bridge drive circuit. In the protues, you can use a high-voltage driver chip like the ICR2101 (24V is considered low voltage compared to the voltage it can drive) to build the circuit. At the same time, you need to consider the addition of some other circuit components, such as the addition of a circuit. Because there was an interelectrode capacity (between the G and S poles) inside the MOS tube, the resistance coming out of the G pole and the interelectrode capacity of the GS formed an RC-charge and discharge circuit. By adjusting this resistance, the rise time of the MOS output from the low level to the high level of the dimming pulse could be adjusted. A parallel connection of the G-pole resistance with a second voltage could make the discharge time of the dimming pulse from the high level to the low level faster, thus affecting the fall time. In addition, when it came to the single-chip processor receiving the signal from the 24V passive switch, the 24V high frequency needed to be reduced to the single-chip processor pin frequency. In the motor control, by controlling the operation of turning on and off the MOS tube in the H-bridge circuit, the motor was controlled and started. For example, through the electromagnetic coil of the contactors in the control circuit, the power supply of the main circuit of the motor was switched on and off to start the motor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Cause of single-phase voltage fluctuation in low-voltage line
Based on context alone The single-phase voltage fluctuation of low-voltage lines mainly has the following reasons: ** 1. Power Source Side ** 1. ** The generator output is unstable ** - The speed fluctuation of the generator will affect the frequency and magnitude of the output voltage. For example, when the speed governing system of the generator's prime motor (such as a steam turbine or a water turbine) fails, the speed may change. If the rotation speed increases, according to the formula [E = 4.44fN 'Phi]([E] is the induced EMF,[f] is the frequency,[N] is the number of coil turns, and [Phi] is the magnetic flux), the frequency [f] increases, and the induced EMF [E] also increases, causing the output voltage to fluctuate. 2. ** Transformer problem ** - The tap setting of the transformer was unreasonable. If the tap position of the transformer was not selected properly, for example, when the voltage needed to be increased, the tap was set to the step-down position, which would cause the output voltage to deviate from the rated value and cause voltage fluctuations. - Transformer malfunction. If the winding was short-circuited, it would change the equivalent induction and resistance of the transformer, thus affecting the voltage output. After a turn-to-turn short circuit, the short-circuit winding's inductivity will decrease. According to U = L_frac{di}{dt}_(U_is the voltage, L_is the inductivity, I_is the current, and t_is the time), the voltage will decrease under the condition that the current rate of change is constant. Due to the unstable state of the short-circuit fault, the voltage will fluctuate. ** 2. Load-side factor ** 1. ** Connection and removal of high-power single-phase load ** - When high-power single-phase equipment (such as large welding machines, single-phase electric furnaces, etc.) suddenly connected to the low-voltage line, it would cause a sudden increase in the line current. According to the value of U = IG (U = IG)(U = voltage, I = current, and R = line resistance), the voltage drop on the line will increase, causing the voltage at the load to decrease. When these devices were suddenly removed, the current would decrease rapidly, and the voltage would rise again, causing voltage fluctuations. 2. ** Unbalanced load ** - In a three-phase four-wire low-voltage system, if the three-phase load was seriously unbalanced, there would be a current flowing through the neutral wire. When there is resistance in the neutral line, there will be a voltage drop of U_N = I_NRN (U_N is the neutral line voltage drop, I_N is the neutral line current, and R_N is the neutral line resistance), which will cause the single-phase voltage to fluctuate. For example, if a certain phase is overloaded, the voltage of that phase will decrease, and the voltage of the light-loaded phase will increase. ** 3. Route factor ** 1. ** Line Resistance ** - The aging of the line or the small diameter of the line will increase the resistance of the line. When the load current passes through, according to U = IG, a large voltage drop will occur. As the load current changed, the voltage drop would also change, causing voltage fluctuations. 2. ** Line inductivity and capacity ** - Long-distance low-voltage lines had the effect of inductance and capacity. When the current in the circuit changed, the inductors would generate an induced electromagnetic force to hinder the change in the current, and the condensers would charge and discharge. These processes would cause fluctuations in the line voltage. For example, in some rural long-distance low-voltage power supply lines, the influence of this kind of inductance and capacity may be more obvious. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>