A free app for Android, by EMonroy.
This is an application that allows you to control a relay via a serial port, which is an important component in many systems. It is used to switch a signal on or off, in this way, you can use it to control a fan, light, or other device.
If you are using an ESP32 or similar chip, the application will need the corresponding drivers, which you can download from the Play Store. You will need to install the driver for the module, which you can find in the same store.
The installation of the driver is very easy, you just need to select the corresponding module and install it.
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