Some months ago, Espressif announced the production of a new chip, named ESP32-PICO-D4.
It’s a complete SiP (System in Package), that is a chip which integrates the esp32 microcontroller, a 4Mbit flash memory, a crystal oscillator, filter capacitors and RF matching links. The chip datasheet is available on the official website.
Using this chip, it’s possible to create very small modules. I recently received one of those from Aliexpress:
To better understand how small it is, let’s compare its size with a “classic” ESP-WROOM-32 module and with a 1 euro coin:
The module includes a chip antenna; it’s also possible to connect an external antenna thanks to the presence of an I-PEX connector.
In conclusion, the availability of the ESP32-PICO-D4 SiP makes it possible to use the esp32 chip in applications where the available space is very small…
For some time, on different chinese webstores (for example Banggood) there is a module called JQ6500 for sale:
it’s often described as a voice sound module or as an MP3 player sound module.
Actually JQ6500 is the name of the main chip hosted on the module:
The chip is manufactured by a Chinese company named JQ. A datasheetfor the chip is also available, unfortunately only in Chinese (but Google Translate can help to understand what it contains).
On the other side of the PCB, the module houses two additional integrated circuits:
a 16Mbit flash memory (25L1606E)
a 3W audio amplifier (HXJ 8002)
When you connect the module to your computer via USB, it is detected as a CDROM drive. If you browse the content of the CD, you can find the MusicDownload.exe application that allows to upload audio files in the flash memory:
The software is in Chinese but its use is very simple: by moving to the second tab you can select the MP3 files to be uploaded. If you now move back to the initial tab, you can start the upload process clicking on the only available button. In the video at the end of this post you can see how it works…
You can control the JQ6500 chip in different ways. The easiest one is using external buttons connected to pins K1-2-3-4-5:
When you press a button, the chip plays the corresponding audio file. For example if you press the button connected to pin K1, the chip plays the audio file named 001.mp3.
The onboard amplifier (HXJ 8002) is a mono IC and its output is connected to pin SPK+ and SPK-. You can therefore connect to those pins a small speaker. If you want a stereo audio, you can instead use pins ADL_L (left channel) and ADC_R (right channel) and connect them to an external amplifier.
This module is an excellent and inexpensive solution to add audio to your projects. The use of an internal flash memory has the advantage of not requiring SD cards or other media to store your audio files; in contrast its capacity (16Mbit = 2MByte) makes it more suitable to reproduce sound effects / guide voices than to make a music player.
In the next articles I will show you how to interface the module with Arduino … meanwhile here is a video showing my first tests:
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