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HOW TO USE DASHBUTTON'S JTAG PIN AS DIGITAL IO
2. Power with battery
1. Long press any one of the four key down, until the four leds light up white color.
2. Wait some time until the four leds turn red, it means dashButton connect to network successfully.
3. Then if you push one key down, the corresponding led will light blue, it means dashButton is communicate
with cloud server.
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