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Brother QL-570 any paper hack
Build an Arduino based thermal scanner
Hi, I've hacked the same printer connecting only the emitter of the sensor to the ground of an oscilloscope. I also disconnected the sensor because it wasn't necessary. I don't understand yet why this happens because, if I connect the emitter to the printer's circuit ground, it doesn't work (I measured 1.6V of difference between this two connections).
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