The input voltage range of stpd01 is 6V to 26.4V. Wide voltage input allows customers to flexibly develop AC multi port power adapter, USB hub, PC display and smart TV. The output voltage value can be set through I2C interface, the voltage regulation range is 3V to 20V, and the minimum voltage regulation amplitude is […]
Articles Tagged: timer
Control design of C8051F340 single chip microcomputer for intelligent measurement system
1 Introduction Figure 1 system structure block diagram The intelligent data acquisition system includes: stepper motor control, data acquisition, data transmission, data processing and other parts (as shown in Figure 1). In order to further improve the reliability of the system and reduce the cost, this paper proposes a solution of system on chip (SOC) […]
Basic principle analysis of 51 single chip microcomputer clock timer learning board
1. Function The clock timer learning board uses 8-bit LED nixie tube to display hours, minutes and seconds in a 24-hour timing mode. Its core chip is dsl302 clock chip, which can record time, date, week and other data. A backup battery is installed on the board, so even if the learning board is disconnected […]
Time error analysis of timer overflow interrupt and CPU response interrupt of 8051 single chip microcomputer
1 Preface Generally, there are several timers inside the single chip microcomputer. For example, 8051 single chip microcomputer has timer 0 and timer 1. When the timer count overflows, an interrupt request is sent to the CPU. When the CPU is executing an instruction or an interrupt service program, its response to timer overflow interrupt […]
Application of timing / counter t0 of AT89S51 single chip microcomputer
1. Experimental tasks The timing / counter t0 of AT89S51 single chip microcomputer is used to generate a timing time of one second as the second counting time. When one second is generated, the second count is added by 1, and when the second count reaches 60, it will start from 0 automatically. The hardware […]
Manufacturing circuit diagram of simple timing small ceiling fan
Note: this small ceiling fan can be timed for 15 ~ 60min. 1、 Working principle circuit The principle is shown in Figure 1 below. The left side of the dotted line is the original circuit of the micro ceiling fan and the right side is the new timer circuit. When the ceiling fan manual switch […]
Schematic diagram of basketball timing and scoring system
There are a lot of keyboards. Only six are used. Two independent keyboards with interrupt ports and four matrix keyboards are used to adjust the score. Relevant source programs can be obtained by clicking the following link:Source c code: basketball game application system
Circuit diagram of timing alarm based on AT89S51 single chip microcomputer
A simple timing alarm controlled by single chip microcomputer is designed. It is required to count down according to the set initial value (1-59 seconds). When the timing reaches 0, the nixie tube flashes “00” (flashing at 1Hz). The key functions are as follows: (1) Setting key: in the countdown mode, press this key to […]
Design principle diagram of timer based on C51 single chip microcomputer
As shown in the figure below, two common cathode nixie tubes are connected to P0 and P2 ports of AT89S51 MCU respectively. P0 port drives ten bits of second time, while P2 port drives one bit of second time. 1 . Put P0 in the “single chip microcomputer system” area 0/AD0 – P0. 7 / […]
STM32 MCU uses timer interrupt to realize the design of millisecond delay
Because STM32 Hal library only has Hal_ Delay() is a millisecond delay. In order to achieve accurate microsecond delay, systick has to be modified. However, due to the internal use of Hal library as timeout judgment and other operations, unexpected errors will occur in its modification, so it is not recommended to modify it. Therefore, […]