- Replace Raspberry Pi with Beagle Bone Black/Industrial Cards
- Map all Raspberry Pi GPIO pins to Beagle IO's
- Maps I2C, SPI and UART to corresponding Beagle Bone ports
- Brings out the Beagle Bone serial debug connector
- Includes 30 pin FFC connector for external display
- Runs all Raspberry Pi software: Command line, Python, Node-RED
- No SD-CARD needed! Runs Linux on internal flash.
- Beagle Raspberry Pi Emulator
Raspberry Pi Emulator using Beagle Bone Black
Raspberry Pi has been the flag-bearer of the low cost single board computers for many years. Except the last few years, of course.
Two years ago you could purchase a Raspberry Pi 3B+ for $35. Now you can buy it on Amazon for $150. If you are lucky. Mouser is quoting a ridiculous 78 weeks lead time.
On the other hand, Beagle Bone cards seem to be readily available, from $50 to $100. They have lots of GPIO pins, I2C, SPI and serial interfaces. The boards run Linux and Node-RED, and could run all Raspberry Pi software.
The Beagle-Pi is a passive adapter which maps all the Raspberry Pi GPIO pins to corresponding pins on the Beagle Bone Black interface. The I2C, SPI and serial ports are mapped to the identical interfaces. The other I/O pins are mapped 1 to 1. PWM pins on the GPIO connector are connected to PWM capable pins on the Beagle Bone.
The board plugs into the Beagle Bone Black board using P8 and P9 connectors, and emulates the Raspberry Pi GPIO connector J1. Any IO board designed for Raspberry Pi can be plugged into the Beagle Pi adapter. The adapter mounts on the Beagle Bone card using the four outside holes. Raspberry Pi HATs can be plugged into the J1 connector and secured using the four inside holes.
Connector J5 selects the source of power for the BeagleBone, from the barrel or the USB connector.
Connector J3 brings out the serial debug port, and J2 brings out the display port of the BeagleBone.
The tables bellow shows the correspondence between the Raspberry Pi GPIO pins and the Beagle Bone pins.
All the Sequent Microsystems drivers have been compiled for Beagle Bone and can be downloaded from GitHub. GPIO pin mapping commands will be available soon.
sudo usermod -a -G i2c node-red
config-pin p9.13 uart
When you purchase the Beagle Pi Raspberry Emulator you will receive the following items:
1. Beagle Pi Board
Sample applications coming soon. Cards are in production right now.
In a world where nothing really works as the marketing departments describe, what a surprise. Plug it in, that's it. Only one advice I did not follow, for I2C a simple command to make it work.
I’ve successfully used three of the Beagle-Pi emulators. They work well. But I have two suggestions:
1. For added insurance, I put a 3-to-5 volt level converter between the 3.3V BBB and the 5 volt devices. Arduinos and I2C LCD modules are 5 volt based. Some of the Sequent Microsystems boards are 5 volt based so you need to be careful not to fry the BBB. It would be nice if this level conversion circuit was designed into the Beagle-Pi board. https://learn.sparkfun.com/tutorials/bi-directional-logic-level-converter-hookup-guide/all https://www.adafruit.com/product/757
2. Version 2 schematics are available on the Sequent Microsystems site. However, the boards I received are version 3.0.