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发表于: 20-08-2021 14:27:41
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I just built myself an add-on board for my CT-3 to test the quality (resistance) of USB cables - it will do A-mini, A-micro, A-C and C-C cables. I also thought that using the internal load would be nice, but having a load resistor on my board makes more sense as it's at the "far end" of the cable allowing a true 4-wire test to be carried out (I'm using DP & DM to detect voltage drop across the Vbus & ground lines). I'm going to write a Lua script which will detect when a cable is plugged in, prompt for cable length from a list, then, once the button on the board is pressed for a second or 2, will cause the cable to be graded from 1 (garbage) to 5 (fantastic).. Here's a link to some photos and schematic: https://drive.google.com/drive/f ... DDh0zao?usp=sharing |
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