In the human machine interaction, the button is a very common way, from the traditional mechanical buttons to the more popular capacitive buttons in recent years, like a keyboard, and any other operation panel of a variety of products such as household appliances or equipment which is a must have. But the above two kind of buttons still have some shortages; Shenzhen Ruihu Tech has developed a creative force-sensitive buttons can be targeted to overcome these problems. The following are some key features of the different button products.

In real life, mechanical buttons are susceptible to be damaged and capacitive buttons are susceptible to be interfered. For example, in the kitchen, wet finger is difficult to operate the capacitive touch panel of refrigerator hood. Small household electrical appliances such as electric kettle have a lot of capacitive buttons, once the water droplets in the above or when wiping with a wet towel are prone to mistakenly trigger buttons. But for force-sensitive buttons, the entire panel without holes, the sensor directly stick on the back of the panel with double-sided adhesive, as long as operator touch the button point on the front panel corresponding position, the button will be effective, waterproof and false triggers can be avoided . In addition to the electrical production process, panel doesn’t need opening holes as well as the capacitive button need to hollow out the metal panel and fill acrylic sheet, the cost reduction as process less. In real life there are a lot of outdoor panels, gate access, elevator, parking and toll gate in express way and it is a big challenge when using mechanical buttons due to its using life and not anti-dust and not waterproof, force buttons can solve such problems. In addition, with the development of society, people like the quality and pure metal panel more and more. So it is a good selling point to adopt the stainless steel or aluminum alloy panel  with force button to achieve functions while not destroy the integrity of the panel. In the actual project development, there are already top level customers in specific projects adopted the force button product of Ruihu Tech since they cannot get satisfied with the solution provide by the famous semiconductor vendors.

Ruihu Tech’s force sensor technology is to print the sensing material on the PCB substrate and already has owned a number of patents, but also the world's first company to adopt common PCB as a force sensor substrate. Ruihu Tech has the capability to design a force sensor mainly due to breakthrough the following four barriers. First, innovation of new sensing material, it can output high SNR signal. Second, the overall design of the sensor is a mechanical structure design, the optimized structure also plays a key role in enhancing the signal to noise ratio. We know that the pressure on the plane will produce deformation, for example, 150g force touches the panel with 0.8mm thickness, and deformation is generally only a few micro meters. How to effectively tranfer such a small deformation to the sensor also need to structural mechanics research, Ruihu Tech has successfully breakthrough it. Third, the sensor output signal is relatively weak, Ruihu Tech has a creative design of the front-end analog amplifier circuit, so that even if using a general MCU with built in 10bit ADC can easily handle the signal. Fourth, the intelligent algorithm is to ensure the effective identification of the keys and system reliability.

For more information, please contact us or purchase the relevant standard development kit.