New features versus previous version V1.0 Rev1.1:
- Added LDO (TPS73633DBVR SOT23-5) to convert 5V(VUSB) to a clean VCC (+3.3v) for ESP32 and which can be enabled by an HydraBus Pin or with a JUMPER on J7 (which connect +3.3V from HydraBus to EN of the LDO)
- Added VCC connector in order to measure ESP32 current/power consumption (if not used to measure current just add a JUMPER on VCC to power the ESP32)
- Added J6 connector to have access to ESP32 SPI FLASH IOs (now all pins are available)
The HydraBus board is a small (60mm x 37mm) and low cost, multi-tool extensible board with STM32F405 Cortex M4F 32bits MCU @168MHz with a fully open source firmware hydrafw and full online documentation hydrafw wiki
The ESP32 is a low-power 32-bit 240 MHz dual core MCU Wi-Fi+BLE combo module that highly integrates TCP/IP network stacks, 12-bit ADC and HSPI/SDIO/UART/PWM/I2C/I2S interfaces. See Espressif ESP32 Overview
Design based on official esp_wroom_32_datasheet_en.pdf (August 8, 2016)
OSH Park Link: https://oshpark.com/shared_projects/dgKJqznH