2015-09-28 (M) Wrist Mounted Chording Keyboard

Code started on 2015-09-25 (F) was fixed. This code was previously posted and since it was updated code shown in both locations was working. Code fixing actually took place over the weekend rather than a single day but resulted in successful tests. Video and images were taken which shows the operation of the servos with a simple switch substituting for a hand operated switch.

Google has made many poor attempts at animating photo bursts but the result from 80+ pictures was a nearly perfect loop which showed the switching being used to move both servos forward and backward simultaneously. There was no need to reverse the frame sequence. A tripod was used to hold the phone steady while the switch was activated.

Loop of servos moving synchronously

Video was taken which also demonstrated the movement but also showed that the switch was not being held at any point but was instead pressed and immediately released. Holding the switch would negate any movement on the part of the servos, motion only begins with the release of the switch. This also ensures there is not erratic movement if the switch were held indefinitely. If immediate reaction is desired the debouncing code in the readHandSensor() function could be removed.

Video demonstration of servo control

Downloadable Files:
To do:
  • Wrist mount
    • Servo arms
      • Bend around spacers
    • Terminal board
      • Input voltage
        • USB
        • 6-15volts
    • Make base for keyboard
    • Integrate:
      • Enclosure for each controller
        • Potentiometer access
      • Activation switch
      • Power connection
    • Debug 
    • Test
    • Refine
    • Repeat
  • Write instructions
    • Compress and link to all files
      • OpenSCAD files
      • STL models
      • Arduino code 
    • Make diagram with every part labeled 
    • Schematic for servo controller

The rest of the posts for this project have been arranged by date.

First time here?

Completed projects from year 1.
Completed projects from year 2

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2015-09-27 (Su)