Adding modern Capacitive Switches to your HMI design.
You know that a device that contains no moving parts will benefit the life expectancy of a product. Also, limiting user connectivity through a defensive layer adds extra component protection. If you are considering using capacitive switches as part of your design, we can assist with your decisions.
Often your solutions may be simple, like a standard graphic overlay may be all that is needed to position over a customers PCB. Perhaps an overlay layer needs laminating to a printed silver circuit? Alternatively, if you require a total solution including all the sensing electronics, we can also source this need and offer options to match your device requirements.
Activation by proximity or touch
Capacitive switches are activated when a user either places a finger close to the device or touches the overlay. This interactivity allows the controller to work whilst mounted behind glass or decorated plastic, and can even apply to curved surfaces offering a cost-effective solution for sleek modern product design.
Endure harsh and outdoor environments • Vandal-resistant • Easy to clean • No moving parts • Slider or Wheel controls • Creatively backlit
How does a capacitive switch work?
You operate a capacitive switch by your touch. Your touch generates a change in capacitance which is detected, triggering the required response.
Most capacitive switches are designed in three layers:
- an upper graphics overlay layer
- a circuit layer (flexible printed circuit or printed circuit board)
- a backer layer (if required)
Typically, the overlay layer is constructed from a durable material like plastic or glass. It is the ability to sense through heavy and thick overlay materials that can make capacitive switch interfaces the right choice if the intrusion of dirt, dust or moisture is a concern. The interface will also be easy to clean and can be made vandal resistant. We can also supply low cost printed silver sensing layers to plug into your electronics.
There are multiple types of interfaces that capacitive switches work with, including buttons, sliders, wheel controls, touch-pads and proximity sensing. These allow for modern-day smart operations to include swiping and dragging.
Every day we encounter capacitive switch technology with our use of;
- Smartphones & tablets
- Vending machines
- Household appliances
- Exercise equipment
- Digital cameras
- Automotive controls
We can offer a range of backlighting solutions for your capacitive switch control panels; including light guide film (LGF) and LEDs. We will consider the requirements of your application such as thickness preference, shape, environmental exposure, and other unique specifications, and help you design the backlighting option that is the best for your product.