Hello please I would like an example of an Android application to control Arduino via a Bluetooth HC05 or Wi-Fi ESP32 module
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Hello Ancien
By "control" what exactly do you mean? Tell us about your project.
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Dear @Ancien_EMESSIENE,
a quick search in the community will lead you to a huge amount of examples as per your request.
Moreover, you can find many "ready to use" app's on @ChrisWard's (https://www.professorcad.co.uk/) and on @Juan_Antonio's (http://kio4.com/) web sites.
In those sites you'll find both AI2 app's and Arduino +HC05/06 (but also ESP32) complete codes.
Starting from a simple character exchange up to servo motors control.
Give it a sight !
Rgds.