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Last activity 2017-05-24 10:44:26 +0200 by stefano.luna

beacon for nrf52

Hello!

I have to sample audio signal from a microphone (MAX 9814 adafruit) with the nrf52 board. I use the saadc and then I perform a FFT of the data using the sdk 13 examples. My idea is to sample ... (more)

127
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Last activity 2017-05-16 10:16:09 +0200 by stefano.luna

From NRF52 to pcb beacon with solar panel [closed]

Hello! I have to connect some microphones (adafruit MAX9814) to a nrf52 board and I have to choose some beacons. My idea is to have a tiny solar panel that charges a capacitor in each beacon (maybe together with a ... (more)

133
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3
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Last activity 2017-05-11 10:02:50 +0200 by Jørn flag of Norway

I2S does not work as expected on nRF52832

Hello,

some time ago I was struggling with interfacing an I2S microphone with the nRF52832. That remained unsuccessful. My conclusion back then was that the selected I2S microphone and the nRF52832 were incompatible (the mic wanted 32-bit word size, which ... (more)

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1
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Last activity 2017-04-18 15:56:40 +0200 by stefano.luna

How can I sample audio and send data via ble on nRF52?

Hi, my setup is:

  • nRF52 DK PCA1040 v1.0.1;
  • Adafruit MAX9814 electret microphone amplifier;

My project concerns about:

  1. Sampling audio from the board with SAADC. A starting point could be, for example, 1s audio record every 15 seconds with ...
(more)

38
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Last activity 2017-03-30 05:28:55 +0200 by Albert

can nRF24L01+ be used on wireless microphone TX/RX?

I'm working on a 2.4GHz wireless microphone (2T1R) project now. I'm wondering can I use nRF24L01+ as the core of transmitter and receiver? Also can it be configured into 2T1R? For the Nordic website, I found the ... (more)

871
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1
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Last activity 2017-02-17 12:50:54 +0200 by Ole Bauck flag of Norway

PDM microphone (02730A0019 or AKU242) electrical connection to nRF52832

Hi,

I am connecting the AKU242 straight to our microprocessor. It is a PDM interface so it has a SELECT, DATA, CLOCK, VDD and 5 GND signals. On the datasheet, there are two identical PDM microphones with one SELECT connected ... (more)

138
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1
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Last activity 2017-02-01 16:31:59 +0200 by Ole Bauck flag of Norway

nRF52840 I2S consumption

What is the most energy efficient microphone input method, PCM via I2S or PDM. Does the SoC have a special HW handling of the PDM format for converting to PCM? Does the filtering of the 1 bit conversion compete with ... (more)

296
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1
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1
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Last activity 2017-01-26 13:06:20 +0200 by Sigurd flag of Norway

nrf52 microphone : SAADC, PDM or I2S ?

I'm starting a new design on nRF52 and I need to connect a microphone on it. Reading the datasheets and questions here, I found there's 3 solutions for the type of microphone and interface to nRF52 :

  • Analog microphone ...
(more)

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6
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3
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Last activity 2016-08-11 13:34:38 +0200 by newtom

i2S digital microphone with nRF52832

I am using a digital microphone using i2S interface with the following signals: BCLK (bit clock), WS (word strobe), SELECT (select for Left/Right) and SDOUT (digital data output).

On nRF52 there are five main signals for i2S including MCLK ... (more)

472
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1
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Last activity 2015-02-23 13:57:35 +0200 by Asbjørn flag of Norway

Digital MEMS microphone interface with nRF51822

I'm looking to integrate a digital (PDM/I2S) MEMS microphone into my nRF51822-based design. I'd like some pointers to reference designs or other information -- the ones that seem relevant on the Nordic site (nRF6929) are locked :(

Has anyone ... (more)

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