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CapSense™ based Joystick Eliminates Drift and Wear Issues

CapSense™ based Joystick Eliminates Drift and Wear Issues

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In the world of gaming, user experience is crucial and as a gamer myself, I know how important it is to have reliable game controllers that provide precision and accuracy. To ensure the best-in-class gaming experience, it is essential to have reliable game controllers but traditional joystick designs based on potentiometers are prone to "drift" and potentially face other reliability challenges that can lead to a poor user experience. However, the implementation of capacitive sensing technology (CapSense™) can solve these challenges and improve the joystick's reliability and on today’s blog, I’ll tell you how that is done and talk about Infineon's touch HMI solution. Let’s dive in!

The problem with potentiometer-based joysticks is that they rely on physical contact measurements, which are prone to wear, tear and drift. The root cause of this issue is that the joystick is based on a potentiometer, which measures the position of the joystick by sliding a metal contact along a resistor. The contact and the resistor eventually wear out, leading to drift and a degraded performance over time. The result is that the joystick will not work as intended, leading to frustration. We all know how frustrated gamers can get, don’t we? 😄

Figure 1. Joystick Game Controller

Nevertheless, to maintain the same user experience, a contactless measurement solution is required. CapSense™ is an ideal replacement for potentiometer-based joysticks, as it provides a non-contact measurement of the joystick's position. CapSense works by measuring changes in capacitance caused by a change in proximity between two conductive objects. In the context of joystick design, this means that the position of the joystick can be measured by detecting the proximity of two, or four, conductive "prongs" without any physical contact.


Figure 2. Passive “Prongs” and CapSense™ Position Sensor

Implementing capacitive sensing technology in joystick design requires no change to the existing mechanical structure of the joystick. The potentiometer is simply replaced with two, or four, passive "prongs" that are used to detect the joystick's position. These prongs are then connected to a differential capacitive sensor assembly that measures the changes in capacitance caused by the joystick's movement.


Figure 3. Contactless Position Measurement

CapSense™ is a superior technology for joystick design because it provides a contactless measurement that avoids wear and tear. It maintains the same user experience, and there is no need to change the joystick's mechanical design. Additionally, CapSense™ offers a one-chip solution for joysticks and push buttons, making it a cost-effective solution for game controller manufacturers.

 Captureh.PNGFigure 4. Performance Specifications

While it is known that game controller manufacturers face challenges in providing reliable and efficient joysticks that offer the best user experience, Infineon has the solution for this. Infineon's CapSense™ solution can replace traditional potentiometer-based joysticks, providing a contactless measurement that is not subject to degradation over time while maintaining the same user experience. Infineon is a top-tier supplier of touch HMI solutions with over 20 years of experience and 100+ touch patents. Infineon's solution is not only reliable and cost-effective but also provides a versatile and efficient solution for game controller manufacturers. With Infineon's capacitive sensing technology, game controller manufacturers can offer high-quality, reliable, and responsive joysticks, ultimately enhancing the gaming experience for users.



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