As you know, with the advancement of technology, the use of touch screens has become widespread. Touch screens allow the user to communicate with the screen of his device with a simple touch. This type of screen is used in most electronic devices, including smartphones, tablets, car screens, etc.

Innovative touch panels are devices with touch screens that are very popular among intelligent home enthusiasts due to their diverse and attractive features. Smart homes can be fully managed and controlled using touch panels. In addition, touch panels in smart homes also play the role of a central server.

Push touch panel

The old touchscreen technology is the analog resistor. It means resistance to the passage of electric current through a thing. These touch panels work by analyzing the amount of pressure and changes in electric current when you perform an activity with it. When you press the screen, contact is made between the top flexible glass and the grid below it. The circuit voltage is measured and the X and Y coordinates of the touch position are calculated based on the amount of resistance at the contact point. This analog voltage is processed by analog-to-digital converters (ADC) to create a digital signal that the device controller can use as an input signal from the user.

Touch panel structure

Touch sensor: The touch screen sensor is a transparent glass panel and has a surface that is responsive to touch. This sensor may be embedded on the LCD screen, as seen in capacitive or resistive touch screens or placed on the frame, as in SAW or infrared touch systems. There are different types of touch sensors on the market today, each of which detects touch input in different ways. Touching the mentioned displays leads to a change in the current or a change in the signal at the touch point, and this voltage change is felt by the touch controller to determine the location of the touch.

System Software: The mentioned software allows the touchscreen sensor and the system controller to work together in harmony. It also tells touch panel operating systems how to interpret the touch feedback information sent from the controller.

Capacitive touch panel

These screens are made of different layers of glass. The inner and outer layers are electrically conductive, so the plate acts like two electrical conductors separated by an insulator. Capacitive touch also has the ability to touch with multiple fingers and does not work with, for example, plastic pens.

PCB capacitors

Most people have seen different types of capacitors mounted on PCB boards. You might think that the capacitor has a complex structure and requires such devices to make it! But this is not the case. It is possible to make a capacitor with only two conductors separated by an insulator. (Of course, this is a simple capacitor) Capacitive touch by cutting the conductors on the PCB, the insulating gap between our designed touch button and the rest The copper plate means that a capacitor is made. In this case, we have connected the copper part surrounding the button to the ground, so we can model the built-in capacitor as a capacitor with one leg connected to the ground and the other ready to receive an electric charge.

The effect of finger touch on the capacitive touchscreen

When you touch the screen of your mobile phone, it changes the capacity of the capacitor. This variation of pulse capacitor capacity is very effective in touch performance. Of course, it is not the case that touching the touch screen with your fingers will discharge the capacitor, so don't worry about this! Because the momentary change of the capacity of the capacitor is an important issue for us, not it's capacity.

Central touch panel

An example of technology that is widely used in homes, office environments, and large commercial complexes today is the central touch panel. The central touch panel, which has a screen of different dimensions, is considered a part of the smart home equipment, which provides its users with the possibility of remote control of home electronic systems through the Internet. This product is produced and marketed in different colors. The central touch panel screen is placed in the middle of the device, and the touch keys are placed on the right side of the monitor, through which the central control panel is controlled. From the use of the central touch panel, we can mention things such as home lighting control, home heating, and cooling control, burglar alarm system control, video iPhone control, access to CCTV cameras, and electric curtain control.

Types of touch panels in terms of size

Touch panels are offered to the market in various sizes, according to their application. The sizes available in the market are as follows:

Touch panels are connected to PLC or PC or any other controller with different communication protocols, such as RS232 - RS485 - RS422, and in these newer devices, they are also connected with ETHERNET protocol and networking. Of course, it is also used to download the program through the USB port. The touch panel is usually used for monitoring and controlling and recording information in a system.

The feedback system is used to measure the position of the rotor and is typically composed of a sensor, such as an encoder, and a feedback loop. This loop is used to measure the position of the rotor and provide feedback to the motor controller, which in turn adjusts the power supplied to the motor to keep it rotating at the desired speed.