When the marriage of hardware and housing, as well as the external components, had passed, we find the following picture inside the prototype and everything works, lights up, listens, can be turned and plugged in. I think it’s an all-round success, so I’ll now give you some impressions of the individual components after they have been fitted with ugly but functional housings. (I’m not a product designer!) 😊
The control box in calibration mode:
Control box with MEMS microphone (left) and phototransistor (right):
An impression of the prototype during one of the first measurements:
The microphone is eavesdropping on the mouse, the control box is ready to calculate and the light sensor has found its place on the monitor. On the screen we see the app changing from black to white and next to it the serial monitor with the measured values.
Summary, licensing and conclusion
Today’s project description summarizes the development of a prototype with which the real latency time of peripheral devices can be measured non-invasively and with high precision. The starting point was the desire to create a future-proof alternative to NVIDIA’s discontinued LDAT without having to laboriously open and re-solder keyboards or mice. This was achieved by combining a MEMS microphone for sound detection with an ultra-fast phototransistor for detecting screen changes. Processing is handled by a Teensy 4.1 microcontroller with ARM Cortex M7, which provides results in real time on an OLED display, via COM port and also as a CSV file on an SD card. LEDs and a potentiometer ensure simple calibration and immediate feedback, while sophisticated voltage stabilization ensures reliable operation.
In addition to the functional implementation, the modularity should also be emphasized: interchangeable components, clean PCB layout and an overall robust design make the prototype suitable for practical use. The tests confirmed reproducible and stable measured values that can be determined without invasive intervention in the hardware.
We offer interested parties and replicators the opportunity to license the implementation and the associated software. On request, we can also supply completely manufactured and tested devices so that they can be used immediately without any development or soldering work.
This project provides a mature, future-proof and practical solution for latency measurements. It combines simple handling with high precision and makes measurements independent of proprietary special solutions. This closes a gap created by the end of NVIDIA’s LDAT and provides users with a tool that is just as convincing in everyday editorial work as it is in their own research or development.






































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