Hello friends,
normally we connect our mobile (or tablet) to Arduino, ESP8266, ESP32, Tiny85, ... by Bluetooth to control a device.
We are going to see how we can control a device using two Bluetooth mobiles, four LDRs and four relays.
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We will use a mobile and build an app to work as a Bluetooth Server. This app will have 4 buttons (up, down, left and right), it will send a number from 1 to 8 according to those buttons are TouchDown or TouchUp.
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Another mobile will be the Bluetooth Client, it will have an application with four circles, these circles will be filled with white or black depending on the button pressed on the Server.
- This tutorial in Spanish:
http://kio4.com/appinventor/9C2_bluetooth_LDR.htm