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VTG led turn red

what does it mean the VTG led turn red ? but it has no bad effect to my project. In addition, I find a strange phenomenon. I use three 1.5v battery to power my board. The APK in my phone still can scan the Nordic BLE device and can connect it when I turn switch s9 to off on the the motherboard nRF6310

0 Asbjørn over 10 years ago

Normally the red light means that you have battery and USB connected at the same time and the S8 switch is in Vsupply position. Could this be what is happening on your board too?
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0 xiaoxiao over 10 years ago in reply to Asbjørn

Thank you for your attention, I have resolved this problem. The board's batteries have dead! what a *** thing, I had changed the batteries a week ago.
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