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 */

    I do get this in the bela terminal when I run the I2CMPR121 on it's own:
    1 mode switch detected on the audio thread.
    Bela stopped
    Building project ...
    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
    output~
    error: ... couldn't create
    verbose(4): ... you might be able to track this down from the Find menu.
    0: bang
    1: bang

      Which basically says sound output - could not create
      --> What is verbose(4) and the Find menu?

        dywen --> What is verbose(4) and the Find menu?

        those are printouts by Pd

        dywen Which basically says sound output - could not create

        interesting! you must be screwing something up pretty badly!

        dywen I do get this in the bela terminal when I run the I2CMPR121 on it's own:

        which project is this?

        dywen /root/Bela/projects/Electret_test/render.cpp:343:3: error: no matching function for call to 'sys_doio'
        sys_doio(pd_that);

        fix this by removing pd_that from sys_doio(pd_that).

                  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

                  alt text

                  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)

                    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...

                    so it looks like your render.cpp file from here is missing these lines from the setup() function:

                    // start DSP:
// [; pd dsp 1(
libpd_start_message(1);
libpd_add_float(1.0f);
libpd_finish_message("pd", "dsp");

                    which are the equivalent of turning DSP on in Pd (i.e.: they are required to perform any audio processing), so without them it is normal that you won't hear anything.

                    Here is an attempt at integrating MPR121 into a modern version of Bela. Please try it and let me know how it goes

                      giuliomoro
                      yes, that did the trick! Very bizarre then that there is audio with the older IDE as it is logical to have to activate the dsp in PD. Non capisco - No lo entiendo - Ik begrijp dit niet - I don't understand.

                      I compared 'my render.cpp' a bit to the one for Trill (which can replace everything here.. and so it goes..).

                      Now the other work begins, making the interface and more complex and musical Pure Data Patches..
                      Thanks!
                      Ciaooo
                      w

                          dywen Very bizarre then that there is audio with the older IDE as it is logical to have to activate the dsp in PD.

                          yes indeed, who knows?