Difference between revisions of "MakaPython Audio"

Revision as of 08:38, 2 July 2020

Introduction

The MakePython Audio board uses the uDA1334 digital to analog converter (DAC), which converts I2S (not be confused with I2C) audio to an analog signal to drive speakers. The I2S Audioboard converts the digital audio signals using the I2S standard to an analog signal.

Model: xxxxxxxx

Features

• NXP Low power Audio DAC: uDA1334
• Integrated digital filter plus DAC
• Supports sample frequencies from 8 to 100 kHz
• Automatic system clock versus sample rate detection
• Low power consumption
• I2S-bus and LSB-justified format compatible
• Digital de-emphasis for 44.1 kHz sampling rate
• Support Micro SD Card
• Working Temperature: -40 – 85℃
• Size: 70*32.6mm

Interface Function

①toggle switch
②toggle switch
③Audio IC:uDA1443
④D3: PWR LED
⑤microSD card
⑥D1:LED controlled by IO21
⑦audio jack(3.5mm)

Required Materials

1. Makepython ESP32
2. MakePython Audio v2.0
3. microUSB Cable
4. Speaker
5. PC
6. SD card

System diagram
Makepython Audio can’t worl alone, it need work with Makepython ESP32(Wrover).

Application

You can get Makepython ESP32(Wrover) from:
https://www.makerfabs.com/makepython-esp32.html

Note: Makepython ESP32 Wroom’s RAM is not enough for audio application, so you need Makepython ESP32(Wrover)

Usage

Warning: Don't operate when powered on in case of short circuit.
This guides help you how to use makepython Audio with Makepython ESP32 to fulfill text to speech(TTS). It’s very simple and easy to understand. It also can play music from SD card or Flash too.

Makepython ESP32(Wrover) used USB-to-UART(CP2104) to upload firmware, you can install the CP2102 driver from:
https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers

Indicator LED Status

Project_1: Text to speech

The example uses MicroPython programming, very simple and easy to understand.
MakePython Audio board cannot work alone. It needs a microcontroller like ESP32(Wrover) to drive it. With Makepython ESP32(Wrover) and Makepython Audio, they can be directly combined to fulfill various functions about audio.

You can get MakePython ESP32 from here: https://www.makerfabs.com/makepython-esp32.html

Hardware interface

ESP32 Booting Mode:

Note: when GPIO12 set to LOW, the internal LDO (VDD_SDIO) output 3.3V; when GPIO12 set to HIGH, the internal LDO (VDD_SDIO) output 1.8V, so it may get fails when you download the firmware if you had insert the Makepython Audio.

Step:
1. Connecting MakePython ESP32 to PC via microUSB cable.
2. Open flash_download_tools_v3.6.8，Select ESP32 DownloadTool

3. Select the related COM port, baud rate 921600，erase the ESP32 first.

Note: In my PC, there is COM272 that may different in your PC.
4. Find the firmware bin file esp32_tts.bin，address 0x1000

5. Click the START to download the firmware.

Wait until it finished.

6. Insert the ESP32 board to Makepython Audio

7. Open uPyCraft, select com port from Tools->Serial

8. Select esp32 from Tools->Board

9. Connect the Makepython ESP32 board.

10. Open main.py from File->Open， you can get the code from here: main.py

11. Click DownloadAndRun Button to download the main.py file to Makepython ESP32.

Input say("hello,world") it will speech hello world.

Or also, you can update the firmware via command terminal, such as:

esptool.py --chip esp32 --port COM272 erase_flash
esptool.py --chip esp32 --port COM272 write_flash --flash_mode dio -z 0x1000 esp32-tts.bin

Code Show：

from machine import I2S
from machine import Pin
import array
import speech


bck_pin = Pin(26)
ws_pin = Pin(25)
sdout_pin = Pin(27)


audio_out = I2S(I2S.NUM0,
                bck=bck_pin,
                ws=ws_pin,
                sdout=sdout_pin,
                standard=I2S.PHILIPS,
                mode=I2S.MASTER_TX,
                dataformat=I2S.B16,
                channelformat=I2S.ONLY_RIGHT,
                samplerate=16000,
                dmacount=16,
                dmalen=512)

a = bytearray(16000*8)
size = speech.say('Hello, wolrld', a)
audio_out.write(a[:size])

def say(text):
    a = bytearray(16000*8)
    size = speech.say(text, a)
    audio_out.write(a[:size])
    
    
def close():
    audio_out.deinit()

Resute:

Project_2: Play music from micro SD card(to be updated)

1. Copy the taunt-16k-16bits-mono-12db.wav file to the microSD card then insert to Makepython Audio.

2. Download the main.py file like previous.

3. Reset the board, Makepython Audio will make sound.

FAQ

You can list your questions here or contact with support@makerfabs.com for technology support.

Resources

• AT Command Set
• V1.0 Schematic