What is it?

Another version of my best seller developing board ESP32-ADB, with ESP32-WROVER, which has larger PSRAM (4MB). The fundamental configuration is same as the original ESP32-ADB, which consists of high-resolution DAC (PCM5102A), OLED display, USB-UART, and Lipo charger.

Why did you make it?

I've known the existence of this big brother, ESP32-WROVER but eventually, I bought several ones and wanted to tackle with this new monster.

What makes it special?

As same as original ESP32-ADB

• On-board USB-UART interface (CP2102)

• big (1.3 inches) and clear OLED display (128x64 pixels)

• Professional grade high-resolution DAC TI's PCM5102A is on-board, connected through I2S with WROVER

• Lipo charger onboard. Lipo operation or USB bus power operation is switchable by the onboard jumper.

NEW

• ESP32-WROVER, 4MB flash with 4MB PSRAM is backside mounted

FAQ about this item

• Which should I select? ESP32-ADB or this item?

MCU of original ESP-WROOM-32 and ESP32-WROVER are the same one. (ESP32-D0WDQ6), meaning same computation power and the same code/binary can be executed. Just difference is the amount of main memory. If you have experienced a shortage of memory or have some ambition to make wonderful something, ESP32-WROVER can be the candidate. BUT, if you want to enjoy just web-radio, Bluetooth speaker or even Alexa, ESP-WROOM-32 (original version) is still a better choice.

• How can I access PSRAM?

When we just compile at esp-IDF or even Arduino IDE without the option, the code will run over SRAM inside ESP32-D0WDQ6 (512kB). Latest esp-idf has 4MB PSRAM option in menuconfig and we can activate PSRAM. Indeed I am also beginner of PSRAM usage and you will find good information at ESP32 forum and also we can ask question there. Several details can be found at this link.

• Why so expensive compared to the original ESP32-ADB?

This is simply due to the price difference between WROVER and WROOM of my purchase. Sorry about that...