WirelessMicrophone.ino

For Arduino Due

Simple Wireless Microphone:

Demonstration of a single wireless microphone/recording via ADC

The outgoing audio format is 8bit, mono, 16khz
NRF24L01+ radios can support around 16-44khz sample rate w/12-bit samples, 88khz+ with 8-bit samples

Note

This code depends on radio.h located in the same directory.

/*
    AutoAnalogAudio streaming via DAC & ADC by TMRh20
    Copyright (C) 2016  TMRh20 - tmrh20@gmail.com, github.com/TMRh20
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
  Auto Analog Audio (Automatic DAC, ADC & Timer) library
 
  Features:
  1. Very simple user interface to Arduino DUE DAC and ADC
  2. PCM/WAV Audio/Analog Data playback using Arduino Due DAC
  3. PCM/WAV Audio/Analog Data recording using Arduino Due ADC
  4. Onboard timers drive the DAC & ADC automatically
  5. Automatic sample rate/timer adjustment based on rate of user-driven data requests/input
  6. Uses DMA (Direct Memory Access) to buffer DAC & ADC data
 
  Auto Analog Audio Library Information:
  http://github.com/TMRh20
  http://tmrh20.blogspot.com
 
  Audio Relay & Peripheral Test Example:
  This example demonstrates how to manage incoming and outgoing audio streams using
  the AAAudio library and nrf24l01+ radio modules on Arduino Due.
 
  1. This example uses the onboard ADC to sample audio/analog data via pin A0
  2. The data is then sent via radio to another device
  3. Audio is captured in 8-bit,mono,16khz.
 
  Library supports 8,10,12-bit sampling at various sample rates.
 
*/
 
 
#include <AutoAnalogAudio.h>
#include "myRadio.h"
 
AutoAnalog aaAudio;
 
/*********************************************************/
 
void DACC_Handler(void) {
  aaAudio.dacHandler();   //Link the DAC ISR/IRQ library. Called by the MCU when DAC is ready for data
}
 
/*********************************************************/
 
void setup() {
 
  Serial.begin(115200);
  Serial.println("Analog Audio Begin");
 
  aaAudio.begin(1, 0); //Setup aaAudio using ADC only
  aaAudio.autoAdjust = 0;
  aaAudio.adcBitsPerSample = 8;
  aaAudio.setSampleRate(16050);
  setupRadio();
}
 
/*********************************************************/
 
uint32_t dispTimer = 0;
uint8_t channelSelection = 0;
 
void loop() {
 
  //Display the timer period variable for each channel every 3 seconds
  if (millis() - dispTimer > 3000) {
    dispTimer = millis();
 
    TcChannel * t = &(TC0->TC_CHANNEL)[0];
    TcChannel * tt = &(TC0->TC_CHANNEL)[1];
 
    Serial.print("Ch0:");
    Serial.println(t->TC_RC);
    Serial.print("Ch1:");
    Serial.println(tt->TC_RC);
  }
 
  // With autoAdjust disabled, getADC() will block until the ADC data is ready
  aaAudio.getADC(32);
  radio.writeFast(&aaAudio.adcBuffer, 32);
}
 
/*********************************************************/