Arduino Nano Ble Sense Microphone - Help - Edge Impulse Forum

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Help ChristoMa September 15, 2021, 10:19am #1 Hi everyone, I’m having issues trying to create a ML with the arduino nano ble sense…I have successfully connected the board to edge impulse, and using the microphone at the frequency of 16000Hz. The issue is that the noise that I’m trying to sample, is over 100db, and when I sample it, I just get nothing from it, like a deaf sound… Is there any possibility to increase the sensibility of the board? jenny September 15, 2021, 10:34am #2 Hi @ChristoMa here’s the datasheet for the microphone on the Arduino Nano 33 BLE Sense: https://content.arduino.cc/assets/Nano_BLE_Sense_mp34dt05-a.pdfHere’s a nice tutorial I found that explains how you can increase the sensitivity of the microphone on the board with a MAX9814 Electret microphone amplifier: https://create.arduino.cc/projecthub/javagoza/sound-spectrum-visualizer-with-arduino-nano-33-ble-3c6261 jenny September 15, 2021, 10:37am #3 You can also manually change the PDM gain in the Edge Impulse SDK by following the instructions in the firmware for Arduino Nano 33 BLE Sense repo here: https://github.com/edgeimpulse/firmware-arduino-nano-33-ble-sense/#edge-impulse-firmware-for-arduino-nano-33-ble-senseAnd associated microphone file: https://github.com/edgeimpulse/firmware-arduino-nano-33-ble-sense/blob/master/src/sensors/ei_microphone.cpp#L335

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