Interactive technology has revolutionised the way we use electronic devices and relate to environments around us. Two of the most widely used methods of interaction are capacitive technology and infrared technology. Both technologies have their own unique characteristics and uses. It’s important to understand their differences in order to choose the right one for different projects. In this blog, we will look at both capacitive technology and infrared technology, as well as their strengths, weaknesses, and applications.
How does capacitive technology work?
Capacitive technology is based on a system’s ability to store electrical charge. In capacitive systems, one electrode usually acts as an insulator. When an object comes near or touches this electrode, the capacitance changes. That change is registered by the presence or touch detection system, triggering the desired action.
Advantages of capacitive technology
- Greater precision: Capacitive touch screens typically offer greater precision compared to infrared technology, making them ideal for applications that require precise touch control.
- Quick response: Capacitive systems provide rapid responses when they detect presence or touch, improving the user experience.
- Works with thin surfaces: Capacitive technology also works through thin materials such as glass or plastic, enabling attractive design options.
- Energy efficiency: Capacitive systems consume less power than infrared technology, and are therefore well suited to wireless applications.
CDVI products with capacitive technology
Capacitive technology offers many advantages. One of the benefits that is most appreciated by installers is the significantly longer battery life. Our TTHS radio transmitters are a popular wireless solution for an exit trigger device. They come in black and white, and the touchless function improves hygiene.
The TTHS transmitters are wall-mounted with one transmission channel. The device is mounted in an enclosed box and is activated completely without touching at a distance of up to 4cm. It’s perfect for controlling gates, automatic door operators, and automatic gates. In addition, the TTHS are well suited to installations in private homes as well as in industrial environments. The transmitter’s communication is encrypted with 64-bit KeeLoq® Hopping Code, offering a very high level of security.
Weaknesses of capacitive technology
- Sensitive to moisture: Capacitive technology can be sensitive to moisture and liquids, which can affect its performance. We recommend that the TTHS buttons are installed indoors to reduce this risk.
How does infrared technology work?
Infrared technology uses invisible infrared rays to detect the presence or movement of objects. Sensors emit infrared rays and measure the reflection of the rays bouncing back from objects to determine their presence or position.
Advantages of infrared technology
- Works at a distance: Infrared technology detects objects from a distance without the need for them to come into direct contact with the sensor. This means it’s well suited to certain applications, such as triggering an automatic door at the front of a shop. However, in other environments, this feature might be considered a disadvantage, if greater precision and security is required.
- Less sensitive to moisture: Infrared sensors are usually less vulnerable to moisture compared to capacitive systems, making them suitable for outdoor applications. However – always check the specifications of individual products to assess suitability for outdoor installations.
- More robust: Infrared technology can be more robust in environments with dust, dirt, or other contaminants.
CDVI products with IR technology
RTE-WIR
This contactless exit device is surface mounted and looks very sleek. The activation distance can be adjusted between 3-15cm. In addition, the RTE-WIR can be connected to an access system or directly to a lock, thanks to its right-facing and reverse-facing lock function.=
RTE-AIR
This compact, surface mount contactless trigger device is ideal for projects with a narrow architrave for installation. The activation distance can be adjusted between 3-15cm. In standby mode, the button lights up blue. When activated, it lights up green. The button has one NO/NC output with an adjustable opening time from 0.1-30 seconds.
Weaknesses of infrared technology
- Lower precision: Infrared technology can sometimes offer lower precision compared to capacitive technology, which can be a disadvantage in some applications that require precise interaction. In other cases, this can be an advantage. For example, if you want to make entry for lots of people at the same time smooth and easy.
- Sensitive to sunlight and reflections: Because infrared sensors use infrared rays to detect the presence or movement of objects, strong sunlight or other light sources that contain infrared light can interfere with the sensors’ operation. Therefore, when sunlight or other light sources hit IR sensors, it can lead to incorrect readings or signal interference. Therefore, it is important to consider the installation environment and possible interference from ambient light sources when using infrared technology. This is particularly advisable in outdoor environments where sunlight can be particularly strong.
- Limited functionality due to thick obstacles: Infrared sensors can be limited by thick obstacles or materials that block infrared rays, which can affect their performance. When installing, take this into account!
Capacitive vs infrared technology: which one where?
Both capacitive and infrared technologies have their unique strengths and weaknesses. Choosing between them depends on the specific requirements of each individual project. Capacitive technology offers high precision and fast response times, while infrared technology is more suitable for distance detection and robustness in various environments. By understanding their differences, installers can select the right technology to optimise the user experience and improve the performance of different systems and devices.