Recently a user was trying to use http to post some audio to be played on a microcontroller with the help of my Audio Tools. This project contains some simple http server implementation, but only for playing audio that is generated by a microcontroller on a webbrowser. However, quite some Read more…
For quite some time I was looking for an easy way to send some audio to some mobile devices w/o having to write my own mobile application. That’s when I found VBAN. They have some free app (and some payed ones that are reasonably priced) and publish their protocol. So Read more…
This week I was looking into the FAAD AAC Decoder and tried to make it work on the ESP32. I was struggling quite a bit with the memory requirements and I could only make it work with a stack of 60k and by using PSRAM. So to fulfill the stack Read more…
Today I was receiving my ordered VS1053 MP3 Shield and I was curious about it’s integration with my Arduino Audio Tools Library using the Arduino UNO R4. MP3 Streaming The first thing I tried was the MP3 Streaming sketch. It was working – a kind of. Unfortunately the WIFI is Read more…
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 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 Read more…
Today I got very upset by a discussion where a user replaced the original question with a misleading conclusion that mixing an A2DP sink with a sine signal was not possible! Unfortunately he also ignored some helpful comments by some other users. So in order to avoid any confusion I Read more…
I was wondering how to use the timers in the new Arduino UNO R4. Unfortunately I did not find any documentation, so I decided to document my findings here. The UNO R4 has two timer peripherals: the General PWM Timer (GPT) and the Asynchronous General Purpose Timer (AGT). There are Read more…
In Arduino we can use the analogWrite(pin, value) method to create a PWM signal on the digital pins. The value parameter is used to change the duty cycle but the PWM frequency which is fixed at usually 490 Hz and can not be changed. Here is a simple example sketch 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 Read more…