Mikronauts.com

Single Board Computers have been adopting the Raspberry Pi GPIO connector pin out – first with the 2×13 26 pin GPIO header of the original Model A & B, then with the 2×20 40 pin GPIO header of the Model A+, B+, and now Raspberry Pi 2 Model B.

I am pleased to add the Hardkernel ODROID-C1 to the list of single board computers supported by RoboPi and its easy to use libraries.

(click on image for larger version – RoboPi on a MIPS Creator CI20)

RoboPi Advanced Robot Controller features eight analog inputs, and 24 flexible digital I/O’s

Each flexible I/O can be configured from the RoboPi API as:

• digital input
• digital output
• servo output
• pwm output
• ultrasonic range sensor input

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Each flexible I/O pin configuration is independent, and may be used in any mix.

RoboPi Supported Platforms as of February 5, 2015 are:

• Raspberry Pi Model A
• Raspberry Pi Model B
• Raspberry Pi Model A+
• Raspberry Pi Model B+
• Banana Pi
• Banana Pro
• MIPS Creator CI20
• ODROID-C1

All of the above platforms support the C/C++ RoboPi API, and all except the MIPS Creator CI20 support the Python API.

Support for the new Raspberry Pi 2 Model B will be added as soon as possible after UPS drops off the new boards (ETA Feb.6/2015)

For more detailed information, including the downloadable User Manual, please visit https://RoboPi.com

For more information or support, please visit the Mikronauts forums at https://forums.mikronauts.com or email mikronauts (at) gmail.com

You can find a simple RoboPi project at https://www.mikronauts.com/robot-zoo/elf-2wd-pi-robot/

How does the MIPS Creator CI20 compare to the Raspberry Pi and Banana Pro / Pi?

Read Mikronauts MIPS Creator CI20 Review and find out!
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Plenty of photos, benchmarks and analysis for your reading pleasure.

https://www.mikronauts.com/reviews/mips-creator-ci20-review-first-look/

Touch screens are great. Keyboards are often necessary. But what if all you need is a numeric keypad?

(click on image for larger version)

In my latest article, I show you how you can easily add a 4×4 keypad to your Raspberry Pi using an MCP23017 I/O expander and Python.
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I also present a very easy to use Python library to read the keypad.

https://www.mikronauts.com/raspberry-pi/raspberry-pi-i2c-4×4-matrix-keypad-with-mcp23017-and-python/

ODROID announced a very interesting single board computer while I was fighting the flu… the ODROID-C1 for only $35

(click on image for larger version – image courtesy of hardkernel.com)

You can clearly see that the major features are very attractive:

• quad core Amlogic ARM6 Cortex-A5 (ARMv7) running at 1.5GHz
• Mali™-450 MP2 GPU (OpenGL ES 2.0/1.1 enabled for Linux and Android)
• 1GB DDR3 32 bit memory at 792MHz
• 40 pin GPIO header, 92.75% compatible with the Raspberry Pi Model A+ / B+ (37 of 40 pins)
• two 10 bit ADC channels (which along with 1.8Vref are the three different pins on the GPIO header)
• four USB2.0 host ports
• one micro USB OTG port
• 10/100/1000 Mbps Ethernet port
• eMMC4.5 HS200 Flash Storage slot
• UHS-1 SDR50 MicroSD Card slot
• on-board Real Time Clock (with battery connector)
• IR receiver
• DC adapter jack to support more current than micro USB
• Ubuntu 14.04 support
• Android KitKat (4.4) support

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Here is a block diagram:

(click on image for larger version – image courtesy of hardkernel.com)
Hardkernel ran a number of benchmarks comparing the ODROID-C1 to the Raspberry Pi, here is a summary of their results:

• 7.8x faster than Pi for Dhrystone-2
• 9.9x faster than Pi for double precision Whetstone
• 4.1x faster for file copy
• close to 600Mbps on a Gigabit network

(I plan on reviewing the ODROID-C1 in the near future, and I will put it through the wringer)

Basically up to eight times the floating point and integer performance – not too shabby!

In order to keep the price so ridiculously low, two Raspberry Pi features were dropped:

• there is no camera connector
• there is no LCD connector

Here is the back of the board – note the eMMC connector and uSD slot:

(click on image for larger version – image courtesy of hardkernel.com)

It will be interesting to see how the ODROID-C1 will do in the marketplace – it certainly has a lot of horsepower for the price.

The Raspberry Pi has about four million installed units, and an incredibly active user forum, serving educational users everywhere.

The ODROID-C1 is aimed more at technical users who need more “oomph”, and don’t need dedicated camera/lcd connectors.

I suspect the ODROID-C1 will find a niche – and supporting Ubuntu and Android 4.4 certainly give it different markets than Raspbian.

Related Links

• ODROID-C1 product page at hardkernel.com
• ODROID Magazine December 2014 issue – features the C1

I need to program a lot of  EEPROM’s. Frankly I got scared of the prices I saw for commercial gang programmers that could program the 24LC256 and 25LC512 EEPROM’s I use.

A bit of googling found software I could use to program EEPROM’s with a Raspberry Pi, so I made an eight EEPROM gang programming board!

(click on the image for a larger version)

A bit of wiring on a prototyping board, a new shell script, and typing

sudo ./blast.sh
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now programs eight EEPROM’s for me! No more programming them one at a time!

Follow the link below for the full article, including schematics, link to the software, gang programming script etc

Making a Raspberry Pi based I2C EEPROM Gang Programmer

Article Index:

1. Why am I building a gang programmer?
2. The Hardware
3. The Software