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…