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Haptic Switch (MoJo 2)

MoJo 2 Application Example: 

Hypersensitive Switch with Haptic Feedback

  • Sub gram sensitivity
  • Auto zero
  • Auto sensitivity
  • Zero finger movement detection
  • No finger release from switch necessary
  • Haptic (vibration) or audio feedback


At its core, a MoJo is a hypersensitive measurement device that is capable of measuring sub gram forces. This can be fifty times more sensitive than the most sensitive of mechanical switches & buttons available today.   With such small pressures it is not possible for the user to know when a valid press has been successfully made, so a small haptic vibration device is built into the sensor indicating a successful press. Alternatively, a buzzer can be connected to indicate the same.

One of the challenges of extreme immobility is that the very limited muscle strength available can be below that necessary to actually move the finger at all.  Even touch sensors that require the user to lift a finger from the device can then prove difficult to use. 

The Mojo is  designed to overcome this by allowing the finger to always rest on the sensor.  The weight of the finger is always present.  The MoJo measures this constant weight and much like a kitchen weighing scale will tare this to zero.  Any tiny additional force is then detectable, even if this is lower than is necessary to move the finger and will then activate a relay (switch) output via a 3.5mm socket.

In addition, the MoJo measure the first trial ‘presses’ the user makes and auto adjusts the sensitivity to match the users capabilities.     For example, if the user can manage a maximum press of say 10g the MoJo will activate at 80% of 10g (adjustable)

Both the tare and sensitivity calibrations are automatic and take only a few seconds each time the device is set up.

The force sensor, called a zSensor is supplied on a small articulated arm mounted from a cushioned hand rest or an articulated arm.  This allows for any angle and position to be achieved to suit whatever convenient movement the user has.     


The zSensor could alternatively be mounted to detect controlled movement from any part of the user’s body such as toes or facial muscles. 


For more information please contact Celtic Magic