To stay "connected and connected," consumers increasingly rely on their portable devices, ranging from smartphones, personal media players and digital cameras to emerging solutions such as notebook co
Add an emergency button to the Android phone to achieve special functional requirements. Does anyone have any good ideas? Android phones only have USB or Bluetooth for peripheral expansion. Let's see
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How to drive a 5V relay with 3.3V level? I am using optocoupler isolation to directly add 5V power to both sides of the relay coil, but it doesn't work. What should I do?