Description
XV-440-10TVB-1-1ABVAR02 Full range touch screen EATON
XV-440-10TVB-1-1ABVAR02 Full range touch screen EATON
Module Clips Drive controller servo motor
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How to use other electronic devices to realize the design of resistive touch screen?
Touch screens are increasingly used in various fields of national production to realize handwriting input, query, control, etc. These touch screens are mostly installed on monitors (CRT) or liquid crystals (LCD), and there are more and more types of touch screens. There are vector pressure sensing technology touch screens, resistive technology touch screens, capacitive technology touch screens, infrared technology touch screens, surface acoustic wave technology touch screens, etc. Each of these touch screens has its own advantages and disadvantages. There are many articles on them, so I will not go into details here. This article mainly introduces the correction principle, algorithm and programming application design of the resistive technology touch screen installed on the LCD.
2.1 Overview
As we all know, touch screens based on resistive technology are divided into four-wire resistive touch screens, five-wire resistive touch screens or more-wire resistive touch screens. However, no matter which type of resistive touch screen, there is one biggest commonality: the voltage is linearly and uniformly distributed. It is precisely because of this feature that the touch screen is very convenient to calibrate and use. Speaking of touch screen calibration, some people may ask why the touch screen needs to be calibrated? We know that the performance of the touch screen itself will be somewhat different, and the position will inevitably deviate when installed on the LCD or CRT. In addition, after using it for a period of time, The performance parameters of the touch screen may also change. Therefore, when we use different touch screens, it is difficult to guarantee that we will get the same touch coordinates even if we touch the same position on the display screen. This makes it difficult for programmers to use the same program to manage and control the touch screen. It is for this reason that we introduced the concept of calibration so that programmers using touch screen devices can use a unified procedure to manage the touch screen.
2.2 Five-point method to calibrate touch screen
2.2.1 Physical coordinates and logical coordinates
In order to facilitate understanding, we first introduce two concepts, coordinates and logical coordinates. The physical coordinates are the actual positions of the points on the touch screen, which we usually measure by the number of points on the liquid crystal. Logical coordinates are the coordinate values after A/D conversion when this point on the touch screen is touched. As shown in the figure below, we assume that the lower left corner of the liquid crystal is the origin of the coordinate axis A. We pick another point B on the liquid crystal (the center of the cross line intersection). B is 10 points away from A in the X direction and 20 points away from A in the Y direction. Then Let’s just say that the physical coordinates of this point on the touch screen opposite point B on the liquid crystal are (10, 20). If the X-to-A/D conversion value we get when we touch this point is 100, and the Y-to-A/D conversion value is 200, we say that the logical coordinates of this point are (100, 200).
2.2.2 Calculation of logical coordinates
Since the voltage of the resistive touch screen is linearly and uniformly distributed, the coordinates after A/D conversion are also linear. If we set the point on the touch screen corresponding to the lower left corner of the liquid crystal as the physical coordinate origin A, its physical coordinates are marked as (XA=0, YA=0) and its logical coordinates are marked as (XLA, YLA) (not necessarily 0). Then the logical coordinates of any point B on the touch screen can be expressed as:
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1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
ABB — AC 800M controller, Bailey, PM866 controller, IGCT silicon controlled 5SHY 3BHB01 3BHE00 3HNA00 DSQC series
BENTLY — 3500 system/proximitor, front and rear card, sensor, probe, cable 3500/20 3500/61 3500/05-01-02-00-001 3500/40M 176449-01 3500/22M 138607-01
Emerson — modbus card, power panel, controller, power supply, base, power module, switch 1C31,5X00, CE400, A6500-UM, SE3008,1B300,1X00,
EPRO — PR6423 PR6424 PR6425 PR6426 PR9376 PR9268 Data acquisition module, probe, speed sensor, vibration sensor
FOXBORO — FCP270 FCP280 FCM10EF FBM207 P0914TD CP40B FBI10E FBM02 FBM202 FBM207B P0400HE Thermal resistance input/output module, power module, communication module, cable, controller, switch
GE —- IS200/215/220/230/420 DS200/215 IC693/695/697/698 VMICPCI VMIVME 369-HI-R-M-0-0-E 469 module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
HIMA — F3 AIO 8/4 01 F3231 F8627X Z7116 F8621A 984862160 F3236 F6217 F7553 DI module, processor module, AI card, pulse encoder
Honeywell — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — D136-001-007 Servo valve, controller, module
NI — SCXI-1100 PCI – PXIE – PCIE – SBRIO – CFP-AO-210 USB-6525 Information Acquisition Card, PXI Module, Card
Westinghouse — RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
Woodward — 9907-164 5466-258 8200-1300 9907-149 9907-838 EASYGEN-3500-5/P2 8440-2145 Regulator, module, controller, governor
YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
