HC-05 not connecting to MIT App (Error 507)

MIT App Inventor Help
1

IMG_3771
IMG_37711814×711 156 KB

I used NerdCave tutorial on youtube and when I tried connecting it to the phone it shows the Error 507: Unable to connect is the device turned on?

We already used different devices and it’s always says the Error 507

Please help. Thank you

BTW, I used RPi Pico for this

2

507 usually happens when you leave a Clock Timer enabled and it sends data without checking if it is connected yet.

Show all the blocks, and post an exported aia file too for good measure.

3

this is the .aia I used (from NerdCave)
Raspberry_Pi_Pico_Tutorial.aia (10.1 KB)

here is the screenshots of the blocks

IMG_3772
IMG_37721687×734 153 KB

IMG_3773
IMG_3773807×637 74.8 KB

IMG_3774
IMG_37741864×421 140 KB

IMG_3775
IMG_37751413×568 118 KB

IMG_3776
IMG_3776773×1196 104 KB

I was wondering if the problem is on the phones we used

4

I can't look at your aia till tomorrow

In the meantime, post your ino sketch file and try using a Bluetooth terminal app from the play store to test your sketch with out the AI2 app.

5

Since you're using a Raspberry and not a genuine Arduino with a HC05, how have you connected the HC05 to the RPi ? Can you post also (in addition to your RPi code, as @ABG has already asked for) the schematic diagram of the connection ?
Cheers.

6

I don't see any problems in your aia export that would cause a 507 error.
Try the other suggestions, the Bluetooth terminal app and posting the sketch code.