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Tag: digital
ESP32/ESP8266 drives 1.8″tft_oled screen imitation digital tube clock based on Arduino framework
ESP32/ESP8266 drives 1.8″tft_oled screen imitation digital tube clock based on Arduino framework Related article “ESP32 drives I2C OLED time display based on U8g2 under Arduino framework” Effect demonstration: The screen display part uses the TFT_eSPI library driver and uses the unique font display that comes with the library. The screen adopts 128*160 1.8″tft_Oled screen. This […]
Designing IIR digital filter using bilinear transformation method
1. Experimental purpose 1. Be familiar with the principles and methods of designing IIR digital filters using bilinear transformation method. 2. Master the computer simulation method of digital filters. 3. Obtain perceptual knowledge of digital filtering by observing the filtering effect on actual electrocardiogram signals. 2. Experimental content 1. Use bilinear transformation method to design […]
Digital modeling experience-data processing-pandas
Digital analog experience-data processing-pandas Detailed explanation of the code: will be added next time import pandas as pd import numpy as np # # Set panda display function # pd.set_option(‘display.max_columns’, 10) # pd.set_option(‘display.max_rows’, 100) # pd.set_option(‘display.width’, 100) Series basic operations obj=pd.Series([4,7,-5,3]) obj 0 4 1 7 2-5 3 3 dtype: int64 obj.values array([ 4, 7, […]
[Java adds and verifies PDF digital signature]
Among the methods for setting up document content protection, in addition to encrypting documents and adding watermarks, applying digital signatures is also an effective means of document anti-counterfeiting and protection. Digitally signed documents are easy to verify and have high authority and credibility. In Adobe PDF documents, there are functions and methods to directly add […]
Digital filter analysis—frequency response
Digital filter analysis—frequency response Amplitude, phase, impulse and step response, phase and group delay, zero and pole analysis. Analyze the frequency and time domain response of the filter. Visualize filter poles and zeros in the complex plane. Frequency response Number field freqz uses an FFT-based algorithm to calculate the Z-transform frequency response of a digital […]
[Opencv-Python] Digital image processing (3) – Spatial image processing (2)
? >Article navigation 1 Experimental purposes and requirements 2 Experimental environment and configuration 3 Spatial filtering 3.1 Image smoothing (mean filter, median filter, Gaussian filter) 3.2 Image sharpening (1) Laplacian template (linear) 4 Experimental experiences and thoughts 4.1 Summary of experimental experience 4.2 Experimental problems and solutions 1 Experiment purpose and requirements (1) Master the […]
Digital clock design based on 51 microcontroller – digital tube display
Digital clock design based on 51 microcontroller (Simulation + Program + Schematic + Design Report) Function introduction Specific functions: 1. Automatic timing, showing 24-hour time, and a 6-digit LED display showing hours, minutes, and seconds. 2. Automatic timing, showing 24-hour time, and a 6-digit LED display showing hours, minutes, and seconds. 3. Equipped with calibration […]
Intelligent temperature control fan design based on 51 microcontroller – digital tube display
Intelligent temperature control fan design based on 51 microcontroller (Simulation + Program + Schematic + Design Report) Function introduction Specific functions: 1. The digital tube displays the current temperature in real time 2. You can set the upper and lower temperature limits 3. When the temperature is lower than the lower limit temperature, the cooling […]
java downloads files to the local tool class by specifying the URL address (including https digital signature request)
java downloads files to the local tool class by specifying the URL address (including https digital signature request) XFileUtils public class XFileUtils {<!– –> /** * Download files from network Url * @param urlStr url path * @throwsIOException */ public static String downLoadByUrl(String urlStr,String savePath, String fileName) {<!– –> if (StrUtil.isBlank(fileName)) {<!– –> fileName = […]