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Last active November 23, 2015 00:12
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writeup about finding electrical lag
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lag.md

Measuring lag on MR controllers

The important thing is remembering that what you want to measure is the time between pressing a button or joystick and the motor beginning to run. The best way to measure this is as follows (you need a digital oscilloscope):

  • Open up a Logitech joystick and solder in two little wires to the a button's pads so that you get a current when it's pressed. Wire these to channel A of an oscilloscope.
  • Attach a pair of leads to a motor controller. Wire these to channel B of an oscilloscope.
  • Write software to run the motor when the button is pressed. Make it as simple as possible.
  • Set the oscilloscope to trigger and acquire on channel A rise (or fall depending on the wiring). Then you can see the distance between the button signal's rising edge and the motor signal's rising edge.
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