Obsidian ESP32: An ESP32 in a Raspberry Pi Form Factor
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An ESP32-based Board in Raspberry Pi Form FactorObsidian ESP32 is an Espressif ESP32-based board in the familiar form factor of popular single board computers like Raspberry Pi. This allows you to use a wide variety of ready-made Raspberry Pi peripherals (or other peripherals) with the Arduino IDE, Espressif IDF, or MicroPython. The Raspberry Pi form factor also allows you to use cases and accessories that are already on the market. And you can do it all with low power consumption.
Latest Obsidian prototype.
Compatible with Espressif Arduino and MicroPythonLeveraging the strong open source software community around the ESP32, Obsidian ESP32 is compatible with the published Espressif Arduino core and MicroPython, as well as the Espressif IDF.
Low-power, Real-time AlternativeObsidian ESP32 consumes significantly lower power than typical Linux single-board computers because it uses a microcontroller running either user code on bare hardware or via a real-time operating system. This allows for a longer battery life and reduced operating energy footprint overall. It shares the form-factor with the popular Raspberry Pi and countless other single board computers, so the end-user can rest easy knowing their project has the flexibility to be easily ported to or from a Linux SBC as the need arises.
Open Source Board Designed with Open Source ToolsThe Obsidian ESP32 was proudly designed in KiCad and its design files will be released under the CERN OHL v1.2.
Features
Footprint-compatible with Raspberry Pi cases
40-pin GPIO compatible with popular expansion boards
3.3 V signalling
I²S for audio DAC
I²C and SPI
Serial UART available on header or via microUSB
I²C GPIO expander with interrupts
ESP32-WROVER-B
802.11 b/g/n
Bluetooth 4.2 / BLE
16 MB flash
8 MB PSRAM
Power Availability
Both 3.3 and 5 V on GPIO
MicroUSB connector
Additional 5 V input through 2 x 2.54 mm spaced holes on the board
I²C GPIO Expander
Allows full communication through the 40-pin GPIO header
Up to 1.7 MHz I²C communication
An interrupt for each of two banks of IO
Address is selectable via solder jumpers
Software Compatibility
ESP32 Arduino Core
MicroPython
ESP32 IDF
Hardware buttons for reset and a selectable boot option in parallel with USB controlled signals
Board Layout
A. Dual 3.3 V regulators for ESP32 and GPIO
B. ESP32-WROVER-B - 16 MB Flash
C. MicroUSB for power and programming
D. Analog inputs connecting to the ESP32’s SENSOR_VP and SENSOR_VN pins
E. TRS jack connected to ESP32 DACs
F. Remaining GPIO from I²C GPIO expander
G. Boot option and reset buttons
H. Address selection for I²C GPIO expander on "ID" line
G. 40-pin GPIO
40-Pin GPIO ConnectorThe high-speed GPIO interfaces (I²C,
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