We can try to use a “Bar Chart” to display the result of FFT or the volume, so it is time to have a look at the built in LED Matrix. The basic API to update an LED is as follows: The LED API – Introduction #include “Arduino_LED_Matrix.h” ArduinoLEDMatrix matrix; uint8_t frame[8][12] = {0}; void setup(){ matrix.begin(); frame[7][0] = true; // acivate LED at 0,7 (left lower corner) matrix.renderBitmap(frame, 8, 12); } void loop(){} I have Read more…

In my Arduino Audio Tools library I am providing a common API to do FFT against different implementations. I was already testing some of the implementations. On ARM microcontrollers we can use the CMSIS DSP library which usually comes automatically with the Arduino Core. This is not the case for the Arduino UNO R4, but we can install the Arduino CMSIS DSP library with the Arduino library manager. Here is the adapted test sketch that Read more…

The easiest way to “record” audio with an Arduino UNO R4 is by using an analog microphone which can be connected to any analog pin. For my test I was using a MCP6022 Microphone Sensor. Arduino Sketch There are no surprises here because we can use the AnalogAudioStream as audio source: #include “AudioTools.h” AnalogAudioStream in; AudioInfo info(8000, 1, 16); CsvOutput<int16_t> out(Serial); // ASCII output stream StreamCopy copier(out, in); // copy i2sStream to CsvOutput // Arduino Read more…

This week I received a brand new Arduino UNO R4 in my mail.It uses a Renesas 32 bit microprocessor and has 256 kB Flash and 32 kB RAM. It provides 1 DAC and 6 PWM pins. I got the version which also provides WIFI and a LED matrix. Unfortunately there is no I2S support, but nevertheless I was wondering if I could get some audio from it. I extended my AudioTools Library by implementing a Read more…