My Project is failed

[zidanjulio]

hello bro I made a design using, Pro micro usb, AD9833, PAM8403, 40Khz. but my project was not successful I want to ask:

1. I did not find pins 11 and 13 on my pro micro module, then I searched the internet about the pro micro schematic. and I replaced them with pins 14,15 as sck and miso. Am I wrong / right?

2. Is there a positive and negative transducer? how to distinguish it, any solution?

[mcore1976]

First of all please use 25kHz transducers not 40KHz. Also please use TPA3116D2 based audio amplifier not PAM8403 (this one is to o weak).

1. For "original" Arduino Pro micr module here is the link : https://learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide/hardware-overview-pro-micro
   You can find there that it Serial bus uses pins : 15 SCK, 14 MISO, 16 MOSI, for CS you can use any other pin like A10 for example, but you have to declare it in the source code here : https://raw.githubusercontent.com/mcore1976/antispy-jammer/main/mic-jammer-ad9833-new-version2.ino
   // Definition of FSYNC , CHIP SELECT pin in Arduino board
   #define FNC_PIN A10

2. Yes, the transducers do have polarity. The isolated pin is "+", the one connected to the housing is "-". In general it does not matter but in this case all transducers need to have same pin selected as "+" otherwise the air audio wave will cancel itself due to the phase mismatch