Board/SSL/SSL1027-dat/SSL1027-dat.md
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* make sure VCC and GND is not reverse
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* Use adjust resistor, make sure the indicating LED off and then start to use, since there is noise in the environment, so you have to set the noise to a small frequency area.
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+## Use Guide
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+
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+1. Power up, power LED up
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+2. Choose and use a fixed voice source, which is the one for identifying, keep it continuously output. use phone app, recommanded 500KHZ, less noise to ear.
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+3. tuning trim pot, until singal indication LED on
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+ - counter clockwise turn for high HZ, clockwise turn for low HZ
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+ - the trim pot has no stop, and reach limit after 15 turns, so when you turn 15 turns, try reverse direction.
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+ - trim pot only reach the frequency in a very small range, and LED on
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+ - Do not turn too fast, and keep close to sound source, otherwise can miss the frequency.
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+ - keep microphone board close to sound source
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+4. turn off sound source, Signal indicating LED off, now the calibrating is finish.
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+
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+Note: Suggest to use the software called
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+* audioSCSI which can output a fixed frequency on PC end
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+* Audio test ton generater or frequncy sound generator on android.
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+
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## Schematic
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## Demo
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-
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+- https://www.youtube.com/watch?v=ChL9mMirgk4
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- https://twitter.com/electro_phoenix/status/1497890295253389314
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- https://t.me/electrodragon3/215
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