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espBerry - ESP32 Extended Functionality through Raspberry Pi HATs
The espBerry DevBoard combines the ESP32-DevKitC development board with any Raspberry Pi HAT by connecting to the onboard RPi-compatible 40-pin GPIO header. The purpose of the espBerry should not be perceived as a Raspberry Pi alternative but as extending the ESP32’s functionality by tapping into the vast offerings of RPi HATs in the market and taking advantage of the multiple and flexible hardware options. The espBerry is the perfect solution for Internet of Things (IoT) applications, especially those requiring wireless capabilities. All open-source code samples take advantage of the popular Arduino IDE with its excellent programming capabilities.
Unleash the powerful ESP32 hardware capabilities to easily connect two CAN ports to Bluetooth, BLE, WiFi, USB, etc.
espBerry Features
- Processor: ESP32 DevKitC
- 32-Bit Xtensa dual-core @240 MHz
- WiFi IEEE 802.11 b/g/n 2.4 GHz
- Bluetooth 4.2 BR/EDR and BLE
- 520 kB SRAM (16 kB for cache)
- 448 kB ROM
- Programmable per USB A/micro-USB B cable
- Raspberry Pi Compatible 40-pin GPIO header
- 20 GPIO
- 2 x SPI
- 1 x UART
- Input Power: 5 VDC
- Reverse polarity protection
- Overvoltage Protection
- Power Barrel Connector Jack 2.00mm ID (0.079″), 5.50mm OD (0.217″)
- 12/24 VDC options available
- Operating Range: -40°C ~ 85°C
Note: Most RPi HATs operate at 0°C ~ 50°C - Dimensions: 95 mm x 56 mm – 3.75″ x 2.2″
Complies to Standard Raspberry Pi HAT Mechanical Specifications…
Dual Isolated CAN Bus HAT
The Dual Channel CAN Bus expansion HAT, designed for the Raspberry Pi, supports the full CAN2.0 Standard, and it features multi onboard protection circuits, high anti-interference capability, and reliable operation. As a result, it suits applications such as automotive devices or industrial automation.
The HAT is well documented, and there are multiple code samples using the C programming language under the Arduino IDE. More Information...
Features
- Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards
- Adopts MCP2515 and SN65HVD230 dual chips combined solution, allows 2-channel CAN communication
- Integrated power isolation, providing stable isolated voltage, requires no extra power supply for the isolated terminal
- Onboard digital isolator, signal isolation makes the communication more safe, more stable, and better anti-interference
- Onboard TVS (Transient Voltage Suppressor) diode, provides ESD protection and transient peak voltage protection
- Onboard voltage translator, select 3.3V/5V operating voltage by jumper
- Onboard 120Ω terminal resistor, configured by jumper
- Breakout SPI control pins, for connecting with host control boards like STM32/Arduino
- Comes with development resources and manual
Software
We are using a modified version of the MCP_CAN Library for Arduino by Cory Fowler. The modifications were applied to match CE0, CE1, INT0, and INT1 signals. Please refer to the library information to perform functionality such as loopback, sleep, etc.
See our post ESP32 Sketch: espBerry with Dual MCP2515 CAN Bus HAT...
Note: The module comes with the demo software installed and tested.
Application Examples
- CAN Repeater - See section "Development Resouces" below...
- Baud Rate Converter - See section "Development Resources" below...
- SAE J1939 250/500k Baud Rate Converter - In Preparation...
- Two Channel CAN to USB Gateway - In Preparation...
- Two Channel CAN to Bluetooth Gateway - In Preparation...
More Resources
- espBerry Data Sheet (PDF)…
- espBerry User Manual (PDF)...
- Dual Isolated CAN Bus HAT - Schematics (PDF)...
Development Resources
- ESP32-WROOM-32D & ESP32-WROOM-32U Data Sheet (PDF)...
- ESP32 Application: Galvanically Isolated CAN Bus Repeater and Baud Rate Converter...
Programming Support
Bluetooth & BLE Information
- Adafruit - Bluetooth & BTLE...
- Exploring Bluetooth 5 - Going the Distance...
- The Basics of Bluetooth Low Energy (BLE)...
- Understanding Bluetooth Range...
Electronics Projects with the ESP8266 and ESP32: Building Web Pages, Applications, and WiFi Enabled Devices
Copperhill Technologies highly recommends using this book for your wireless application projects. Yes, many good books and free online resources are available these days, but this is the book we are using. It made our approach to Bluetooth, BLE, and WIFI a breeze. Programming wireless applications without hassles was fun, and we will share them on this web page.
Projects throughout the book utilize the wireless functionality and processing power of the ESP microcontrollers. Projects are built in the Arduino IDE, so you don't need to download other programming software. In addition, mobile apps are now ubiquitous, making the app build projects of the book very relevant, as are the web page design projects.
In Electronics Projects with the ESP8266 and ESP32, you'll see how easy and practical it is to access information over the internet, develop web pages, build mobile apps to remotely control devices with speech recognition, or incorporate Google Maps in a GPS route tracking app.
