Hi adanlbenito I am interested in the Bela Mini footprint and symbol for Kicad! The only thing I have to solve if I use the mini instead of the bigger Bela, is the MicBias - but that should not be too hard..

giuliomoro An interesting application mentioned in the datasheet is that if you need programmable trimming of the voltage into MTSA, you could use one of Bela's analog outs instead of a resistor divider.

I know, it's with PWM, I believe. I chose the voltage dividers, because I have to figure out PWM with Pure Data...

London - cool, I'm listening to the Resonance fm Mixcloud now

Remork Perfect - confirming repetition is good
This chip has a whole boatload of spec sheets.. https://www.microchip.com/wwwproducts/en/MTCH101
Bedankt!

Hello, London (?) and Antwerp (cool!),

The reason why I'm asking is this:

5 volt makes the detection distance significantly larger. But indeed it's VDD that needs this! From one of the spec sheets (I realize now - - )

Figure 3 shows the relationship between detection distance and sensor size. Higher V DD voltage also extends the distance, because with higher V DD the sensor will generate stronger electric field for sensing.

@giuliomoro Where is

P9.07 ?

Here?

I'm trying with the potentiometer, but the sweet spot of activation is just so much further from the sensor with 5 Volt (which I now understand and did not before).
Thanks so much for thinking and reading along with me! First time I've used a smd sensor from scratch

Greetings from Brussels, where at this hour 'there ain't nobody here but us pigeons',
Delving deeper into the electronics universe..

Ciaooo - keep safe -
W

Hi,
I'm using a chip that needs 5 Volt to operate properly. 3.3 also works, but I lose a lot of range with only 3.3 Volt.
The Bela schematics explicitly state to not use 5V with the digital pins, but I did not find more information on this elsewhere.

This is how the Proximity sensor switch chip is connected to Bela - quick sketch:

So Pin 4 in this sketch goes to
- Digital in 2 of Bela (12 in Pure Data) (not GPIO8 as in the drawing)
- with a 4.7k resistor to 3.3 Volt (which I would like to be 5 Volt)
- to a resistor, followed by a Led to 3.3 Volt again
--> I want on this drawing all 3.3 Volt to be 5 Volt. I have been prototyping first with Arduino and the sensitivity is a lot better, also clear in the chip documents.

Question ====> Can I use the Bela 5Volt pin in this set-up?
----> Or should I include a step-up from 3.3 to 5 Volt?
----> or should I just get my 5 Volt elsewhere? Does this influence the Bela digital ins?

Thanks!
Greetings from a quiet Brussels,
Wendy

In August 2019 this render.cpp for the mpr121 Touch sensor worked.
--> So I have reverted back to the IDE that was available at that time: v0.3.6b
And guess what, I have sound

So in the rewrite of the IDE something happened that disables sound in the render.cpp I have.

This was a lot of unnecessary misery...

giuliomoro Which basically says sound output - could not create

interesting! you must be screwing something up pretty badly!

So, I added a |dac~| and the no sound output error disappeared
Late night forum posting
This is the Patch I'm using to test the MPR121

Output is perfect, a bang each time I touch the sensors:
Bela stopped
Building project ...
Building render.cpp...
...done
Extracting dependencies of library Midi
Extracting dependencies of library Scope
Extracting dependencies of library UdpServer
Linking...
...done
Build finished
Running project ...
Running Pd 0.48-2
No MIDI device enabled
bonk version 1.5
fiddle version 1.1 TEST4
pique 0.1 for PD version 23
sigmund~ version 0.07
0: bang
1: bang
2: bang
3: bang

-----> Back to post 1 in this Forum thread, still using these render.cpp and I2CMPR121 files: https://cloud.constantvzw.org/s/pNc45tZKRx2aRsQ
Which worked fine in August 2019, here's a video: http://www.wvanw.space/?p=322

(yesterday I worked with someone who's really good at pd, we have turned everything outside in)

I have now reverted to my old render.cpp, and the I2CMPR121 files, adapted the library paths and now I get this error:
no matching function for call to 'sys_doio' column: 3, line: 343
/root/Bela/projects/Electret_test/render.cpp:343:3: error: no matching function for call to 'sys_doio'
sys_doio(pd_that);
^~~~
/usr/local/include/libpd/s_stuff.h:168:6: note: candidate function not viable: requires 0 arguments, but 1 was provided
void sys_doio();
^
1 error generated.

make: *** [/root/Bela/projects/Electret_test/build/render.o] Error 1

Line 343 gives:
#ifdef PD_THREADED_IO
void fdLoop(void arg){
t_pdinstance pd_that = (t_pdinstance)arg;
while(!gShouldStop){
sys_doio(pd_that);
usleep(3000);
}
}
#endif / PD_THREADED_IO */