CTRL-m (capacitive touch response latency measure) is a device used to calibrate the refresh rate of a touch screen, improving the accuracy of data capture for cognitive alertness tests used by NASA research labs.

The device triggers a fake human touch when a flash on the screen is registered. It uses an LDR to complete the circuit, sinking the capacitance from the surface with a copper pad. This test can then be performed thousands of times a minute.

It can be made using a simple microcontroller and a 3D printer - allowing researchers all over the globe to improve the accuracy of their data capture. Our initial tests saw an improvement from ~120ms to 7ms.

Project completed at:

NASA Ames Research Centre


Kenji Kato


Research and Development



3 months, 2018



Douglas Mann

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