HS code-based commodity chain analysis

1. Principle: The role in the control system is to start the single-chip microcomputer to start working. However, when the power supply is turned on and the voltage is abnormal or interfered during normal operation, the power supply will have some unstable factors, which may have a serious impact on the stability of the single-chip microcomputer. Therefore, when the power is turned on, the output time is delayed to the chip to output a reset signal.

2. Then the D3 hour is compared with the constant, for example, D3 is greater than or equal to 19 (i.e. 7 p.m.) Y0 output, and D3 is less than 5, Y0 output, so that between 7 p.m. and 5 p.m. the next day, Y0 output. For example, night lights. Hope to adopt..

3. The embodiment of normal function. According to the query methodAccording to the official website of Semiconductor Group, the stm32 single-chip microcomputer achieves the effect of light flow through alternate flashing. When flashing, the four lights of the single-chip microcomputer will flash in turn, which is the embodiment of normal function. The STM32 series is specially designed for embedded applications that require high performance, low cost and low power consumption.

4. Prepare materials: You need to prepare the following materials: single-chip microcomputer (such as Arduino, STM32, etc.) LED lamp resistor (used to limit current to prevent LED overcurrent damage) connection cable connection circuit: connect the LED lamp to the single-chip microcomputer.

5. The principle of the smallest human system of this single-chip microcomputer is to take advantage of the small and high-intensity computing power of the single-chip microcomputer. It is suggested that we can try a new single-chip microcomputer to see such a system composite.

6. Start the timer.The first part is to set the time base. The second part is to select the timer mode and set the time ratio (that is, the TIM_Pulse above).

Are the pins of the minimum system of stm32 the same?

When it is first energed, the current will pass through R19 and C20 to charge C20. At this time, the pin of NRST is at a low level. When the C20 is fully charged, the C20 is in a state of "cut-off". At this time, NRST changes from low to high level... System clock... The system clock is generally an external crystal oscillation circuit, which is equivalent to giving a heartbeat to a single-chip microcomputer.

There is also a power pin, which is VBAT. BAT isIt's Battery, which is easy to understand. This pin is used to connect the positive pole of the battery. STM32 has RTC function (real-time clock), so it has VBAT pins. There is a contradiction that needs to be solved here.

The range of the input level of the STM32 pin is ALVC, the input is less than 0, the input is greater than 2V, the high level is counted, and 8V in LV and ALVT is the low level.

The new series adopts three packages: LQFP6LQFP100 and LFBGA100. Different packages maintain the consistency of the pin arrangement, combined with the design concept of the STM32 platform. Developers can re-optimize functions, memory, performance and number of pins by selecting products to meet personalized application needs with minimal hardware changes.

How to draw the minimum system of STM32 single-chip microcomputer

Draw pins according to the datasheets of different STM32, and then draw them according to each pin function and the peripheral functions you want to achieve. The minimum system and peripheral circuit is a single-chip microcomputer schematic diagram. Of course, it is drawn with reference to the official document.

What we need to do is to use the development board for all the pin functions of the single-chip microcomputer. Let's draw the minimum system of the single-chip microcomputer first, and then we can continue to add other peripheral devices. In the previous article, we have finished drawing the single-chip computer. I believe you already know something about STM32F103VET6.

Reset circuit Crystal oscillation circuit,You can also not. Use the internal crystal oscillator to supply the power supply, and all VDDVSS should be connected. Note that the analog power supply reference VSSA and VDDA must be connected. Leave the download interface, SWD interface, mainly SWDIO and SWCLK ports.

Draw pins according to the datasheets of different STM32, and then draw the minimum system and peripheral circuits according to each pin function and the peripheral functions you want to achieve, which is a single-chip microcomputer schematic diagram.

The new series adopts three packages: LQFP6LQFP100 and LFBGA100. Different packages maintain the consistency of pin arrangement. Combined with the design concept of the STM32 platform, developers can re-optimize functions, memory, performance and number of pins by selecting products to the most Small hardware changes to meet the needs of personalized applications.

What parts does the stm32 minimum system consist of

stm32 minimum system is composed of power supply, reset, clock, debugging/download interface and startup. The power supply stm32 single-chip microcomputer is generally powered by 3V, and the capacitor plays the role of filtering.Reset STM32 reset pin is low-level reset, normal working state, reset pin is high-level.

A single-chip microcomputer development board is "single-chip microcomputer + peripheral chip". It is entirely up to you to decide what functions a single-chip microcomputer development board needs to do. You can only make a development board with only a single-chip microcomputer, which is the smallest system board just mentioned, or you can do all the functions of the single-chip microcomputer, or you can do only a part of it.

The minimum system of stm32 does not have a buzzer. The minimum system of stm32 mainly has 6 parts: power supply module, crystal circuit, download circuit, reset circuit, boot circuit and filter circuit.

How to connect solar panels to single-chip microcomputers?Do you want to add a battery?

The battery needs to be stored. The solar panel charges the battery, and the battery supplies power to the single-chip computer through the power conversion board. Only with a storage battery can the single-chip microcomputer work continuously. The output voltage of the solar panel is directly converted and used by the single-chip microcomputer. When there is no light or the light is weak, the single-chip microcomputer cannot work.

Single-chip microcomputer control module and controller (mainly to protect the battery), and then connected to the battery. The solar panel shines on the silicon wafer through photons, generating electron transitions, thus generating current, and then storing the generated energy on the battery.

It is reasonable to charge the battery with solar energy first, and then stabilize the voltage of the battery (5V) and then supply power to the single-chip microcomputer, because it is directly connected to the single-chip computer. When the sunlight is full, it may be overvoltage and insufficient.It works, so it is the most reliable way to charge the battery first, and then stabilize the voltage and use it on the single-chip microcomputer. Please refer to it.

stm32 schematic diagram

1. Method 3: Modify the component schematic diagram with the same packaging structure as STC89C51 in the existing component library to make the graphics you want. This also requires the foundation of the second method. The most used software is AltiumDesigner. This software can draw schematics and pcbs.

2. Schematic diagram: startup mode: 1. The first startup method is the most commonly used user FLASH startup. The default startup mode. 2. The second startup method is the SRAM startup embedded in STM32. This mode is used for debugging. The third startup method is the system memory startup method.

3. The smallest system with STM32F103 as the core of the control circuit includes STM32 main chip, clock circuit, reset circuit, UARTUSB conversion circuit, JTAG debugging interface circuit, power supply, etc. The schematic diagram is shown in Figure 2.

4. A reset circuit is a circuit device used to restore the circuit to the starting state. General situation: power-on reset; connect a capacitor to the VCC end on the RST reset input pin, and connect a resistor to the ground. Principle: The role in the control system is to start the single-chip computer to start working.

5. This is a schematic symbol, and you can't see the pcb encapsulation. Open the schematic diagram in the schematic editing software, double-click this with the mouse, and the encapsulation option will appear. As shown in the figure below: double-clickThen it appears: Footprint, which is the name of the device package, which can be the package made by the user himself, or the package in the pcb package library.