Error 503: not a valid mac adress (arduino +HC05 + App inventor)

MIT App Inventor Help
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Hello everyone,

I try to make this application:--> sending a value from a potentiometer via bluetooth-module HC-05 to android phone by following this tutorial:
http://electronoobs.com/eng_arduino_tut20.php

In a first atempt, I made the app myself. When downloaded to my android phone, I received the error 503: the specifeid address is not a valid bluetooth MAC address.

Because I couldn't solve this error with the help of internet, I downloaded the completer project directly from the electronoobs website and Installed it with the MIT app to my phone. And again I receive the error 503 again!
The error occurs when I click on the button to connect bluetooth in the app itself.

MIT App blocks:

screenshot
screenshot1455×869 93 KB

Arduino code:

screenshot 2
screenshot 2482×552 34.1 KB

I don't find many solutions on the internet. It seems I am doing something very wrong but without any idea what it could be.
Can you help me with this problem?
thanks
Pieter

2

Do you understand the English words "after picking" and "before picking"? If you know what this means, take a look at your blocks and think about their use.

1 Like
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You dont have to be so mean. He missed a small mistake thats it

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