Michael Frick asked 5 years ago
How can for example a set point be sent to to the client (ex. a set point set at the phone then sent to ESP32 similar to a high temperature set point that could be used to turn on the LED)? Also how could we read the condition of the LED (ON/OFF) on the ESP32 and send it back to the phone? Also, anything on using CSV to read/send data and ON/OFF control?
Thanks! Great course.
Rui Santos Staff answered 5 years ago
Hello Michael,
You need to create a new field in the BLE App that sends that value to your ESP32.
Basically, you need to create a new field and a unique CHARACTERISTIC_UUID_X that is connected to the app to receive that value when it changes. Then, your ESP32 code receives that value and stores it in a variable.
With some if/else statements, you should be able to use that value to either turn the LED on or off…
About the CSV, unfortunately I’ve never done anything like that… So I don’t have any examples or suggestions…
I’m glad you are enjoying the course. Thanks for your kind words!
Regards,
Rui
Michael Frick answered 5 years ago
So once you create a “Service UUID” you only need one Service but for each value you want to send or receive you need to create a “Characteristic UUID” for each one? Thanks!
Rui Santos Staff answered 5 years ago
Exactly, you only need one “Service UUID” that can have many “Characteristic UUID”.
Michael Frick answered 5 years ago
Here’s an interesting multiple LED control from both the Android device and push buttons on board.
http://www.martyncurrey.com/arduino-hm-10-and-app-inventor-2/#part3
Rui Santos Staff answered 5 years ago
You could also have just one “Characteristic UUID”, but depending on the message sent it can control mutiple LEDs. But a better approach is to create a “Characteristic UUID” for each LED.