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    Question of the circuit to transmit external signal to a smartphone app

    Hi all,

    I have the following target to achieve and want to know what kind of circuit that I can use? Anything that can be purchased in the market directly is preferred. Thank you!
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    Re: Question of the circuit to transmit external signal to a smartphone app

    Hi,

    Look for bluetooth modules.
    Like HC-05 or similar.
    You may reprogramm them with Arduino iDE.

    Similar:
    ESP-1 or ESP-01 modules (WiFi)

    You could also use IrDa if your cellphone supports it.

    Klaus
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    Re: Question of the circuit to transmit external signal to a smartphone app

    +1 for Klaus.

    Personally I use ESP8266 or ESP32 modules for this because they are very inexpensive and you don't need an app on the phone, they can publish their own web page with your sensor information in it. If you link them to a Wifi router you can also make the link work over the internet so the phone doesn't have to be in close proximity.

    Brian.
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    Re: Question of the circuit to transmit external signal to a smartphone app

    Hi KlausST, if I decide to use a prox sensor to connect to a HC-05 module +Arduino like this https://create.arduino.cc/projecthub...arduino-e0ca81, how can I find the reference design to start to let HC-05 transmitted the detected information from prox sensor to the smartphone? I am very new to Arduino and do not know what I can play with by adding new components to the existing design.

    Thank you!



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    Re: Question of the circuit to transmit external signal to a smartphone app

    Hi,

    The linked site tells you everything you need to know.

    What additional information do you need?

    Klaus
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    Re: Question of the circuit to transmit external signal to a smartphone app

    Quote Originally Posted by KlausST View Post
    Hi,

    The linked site tells you everything you need to know.

    What additional information do you need?

    Klaus
    Hi Klaus,

    I want to know in addition to that design, if I add a prox sensor circuit to output "1" or "0", how can I connect it to the Arduino and modifying the firmware, thus the BLE can output a control signal to tell the app what is the signal generated by this prox sensor. I only know some hardware and do not know what can I start to modify the Arduino code.

    Thank you!



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  7. #7
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    Re: Question of the circuit to transmit external signal to a smartphone app

    Hi,

    You give more riddles than informations.

    Define:
    * proximity sensor
    * Arduino
    * modifying the firmware
    * control signal
    * what you want to achieve at all

    Use pictures, diagrams, clear descriptions....

    Klaus
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