A user interface is like a joke. If you need to explain it, it’s not that good. Martin Leblank
What to use and why
- Pressure sensitive materials
- MEMS (MicroElectroMechanical System)
- Usually 3 Degrees of Freedom (3DOF)
- Measures acceleration, usually in ”g”
- 1g = 1 standard, sea-level gravitational pull towards earth.
- Weight = Mass X Acceleration (from gravity) (w=ma) (you have the same mass on earth and the moon but weight more on earth) Gravity is ~ 9.8m/s2
- Cheap (Roughly 3.50)
- Reasonably accurate (Roughly 3mm)
- Good range (5m) • May suffer from noise issues
- Especially when using multiple
- Work as fast as trigger to receive time
- Distance = travel time / 2 * Speed of Sound (343m/s)
- Subject to ambient light issues
- Cheap units have low “resolution” of colour spectrum.
- Good single sensor choice for multiple object detection in controlled environment.
- Fast • Variable range / function
- Beam break
- May be Subject to interference
- External sources
- Other devices
- Ambient conditions
Reflectance (Sensing distance)
- Light or Infra Red
- Can be used to sense distance
- Subject to interference
- Can be very accurate
- Lasers can be used
- Time of flight measurements
Velostats and Stretching things
- Velostats are conductive materials made of polymeric foil and carbon black.
- Originally used as anti-static packaging
- Great for prototyping
- Workable (cut to size)
- Easy to read (use in a resistor bridge)
- Great for clothing and flexibility
- Surprisingly strong
- Check Adafruit, core-electronics, etc.
This week the team regrouped and looked at the feedback that the client had supplied us with and looked at the concepts that were chosen. One of Asas’ designs, a moving focus pad machine was chosen and one of mine, a interactive workout mat was chosen.