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by mikronauts
Thu Jan 23, 2014 1:32 am
Forum: Scratch
Topic: Which Scratch is easier to extend?
Replies: 16
Views: 5491

Which Scratch is easier to extend?

Hi, I've never used Scratch, but I want to add to it so it supports my upcoming Pi products. From reading the forum, it seems there are two different versions of Scratch for the Pi: http://cymplecy.wordpress.com/scratch-raspberrypi-gpio/ and "a new Scratch" http://www.raspberrypi.org/phpBB3/viewtopi...
by mikronauts
Thu Jan 23, 2014 1:19 am
Forum: General programming discussion
Topic: RPi.GPIO-like module for i2c?
Replies: 6
Views: 1765

Re: RPi.GPIO-like module for i2c?

http://wiringpi.com/

supports MCP23017
by mikronauts
Wed Jan 22, 2014 5:34 pm
Forum: Automation, sensing and robotics
Topic: Coming soon - a new robot controller for Pi
Replies: 0
Views: 523

Coming soon - a new robot controller for Pi

I am expecting the production PCB's to arrive by the end of the month.

Until then, here is a nice photo of RoboPi stacked on top of a Model A Raspberry Pi:

Image
(Right-click View Image for a larger photo)
by mikronauts
Tue Jan 21, 2014 4:42 pm
Forum: Raspberry Pi OS
Topic: Help with Apricot on APC 8750
Replies: 4
Views: 1940

Re: Help with Apricot on APC 8750

See https://groups.google.com/forum/#!forum/apc-pico-itx-boards I'm trying to work with the Apricot image on an APC 8750 - and it seems like all the Apricot files have disappeared off the Raspbian site. Specifically I'm looking for the kernel patch that used to be here: http://www.raspbian.org/Apric...
by mikronauts
Mon Jan 20, 2014 8:09 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB to I2C breakout board??
Replies: 5
Views: 2901

Re: USB to I2C breakout board??

Ok, I now better understand what you want to do. Easiest path: Add a USB-serial converter to the Pi's serial port; plug the USB end into a PC, control the Pi with a simple serial protocol (that would in turn control your tuners) Sorry I should have mentioned this early but I've already done i2c work...
by mikronauts
Mon Jan 20, 2014 8:07 pm
Forum: General discussion
Topic: wifi dongle without powered hub?
Replies: 9
Views: 2401

Re: wifi dongle without powered hub?

Try the tutorial at http://learn.adafruit.com/adafruits-raspberry-pi-lesson-3-network-setup/setting-up-wifi-with-occidentalis Hi mikronauts Ive tried a 2A powersupply, but still cannot connect to my pi. Iv'e tried windows cmd using an ipconfig to see if it's on my network, but i cannot see it. I sea...
by mikronauts
Mon Jan 20, 2014 8:02 pm
Forum: HATs and other add-ons
Topic: EZasPi (B) - new prototyping board, stacks UNDER the Pi
Replies: 3
Views: 2201

Re: EZasPi (B) - new prototyping board, stacks UNDER the Pi

I've updated the product page at

http://www.mikronauts.com/raspberry-pi/ezaspi-b/

I added some simple assembly instructions, a few more photo's, and links to the Ebay auctions for samples.

Please do not hesitate to ask any questions you may have about EZasPi (B)!

Bill
by mikronauts
Mon Jan 20, 2014 7:59 pm
Forum: HATs and other add-ons
Topic: EZasPi - new prototyping board stacks on TOP of Raspberry Pi
Replies: 6
Views: 3785

Re: EZasPi - new prototyping board stacks on TOP of Raspberr

I've updated the product page at http://www.mikronauts.com/raspberry-pi/ezaspi/ I added some simple assembly instructions, a few more photo's, and links to the Ebay auctions for samples. Please do not hesitate to ask any questions you may have about EZasPi! Bill p.s. I built an extremely simple robo...
by mikronauts
Mon Jan 20, 2014 6:46 pm
Forum: Automation, sensing and robotics
Topic: Building a robot with Model A
Replies: 9
Views: 2446

Re: Building a robot with Model A

Sorry, there is not a free on-line version of the article on-line at this time. When submitting articles to most magazines, you have to give them an exclusive for a period of time. If TheMagPi is interested, I could do a follow up article for them - however I have not heard back from them; unless of...
by mikronauts
Mon Jan 20, 2014 4:24 pm
Forum: General discussion
Topic: wifi dongle without powered hub?
Replies: 9
Views: 2401

Re: wifi dongle without powered hub?

+1 on booting the Pi with the WiFi dongle already inserted.

You also need a good quality power supply for the Pi, I'd recommend 2A or more.

I've used the WF-2111 on my Pi's, without a hub, with great success.
by mikronauts
Mon Jan 20, 2014 4:22 pm
Forum: Automation, sensing and robotics
Topic: Building a robot with Model A
Replies: 9
Views: 2446

Re: Building a robot with Model A

I run the Pi of one of those "power banks" USB, and use 4xAA's for the servo. A voltage divider (2k4 to signal, 4k7 to ground, then to pi pin) works as an interface to 5V signals, and can drive the servo's signal pin. DO NOT power the Pi from the same supply as the servo's. LM7805's usually need at ...
by mikronauts
Mon Jan 20, 2014 4:16 pm
Forum: Automation, sensing and robotics
Topic: POLL: What protocol to use for new Pi robot controller?
Replies: 0
Views: 335

POLL: What protocol to use for new Pi robot controller?

Hi guys, I am getting close to releasing a new robot controller board, and I want to support PIGPIO, WiringPi and Scratch. (The prototype was 100% functional, and I expect my production run by the end of the month) What protocols would you all like to see for talking to the controller? The normal mo...
by mikronauts
Mon Jan 20, 2014 4:07 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB to I2C breakout board??
Replies: 5
Views: 2901

Re: USB to I2C breakout board??

Why not simply use the Pi's I2C ports? rev1 Pi's have one I2C port on the 26 pin header rev2 Pi's have two I2C ports, one on the 26 pin header, one on the P5 header (on the bottom of the board) I've used the top port with great success, and I even designed a Pi prototyping board so I could use the b...
by mikronauts
Sat Jan 18, 2014 3:52 am
Forum: Camera board
Topic: Still confused, whats the diff between these 2 cameras?
Replies: 11
Views: 2736

Re: Still confused, whats the diff between these 2 cameras?

fyi,

Shipping from the US and Canada is expensive. You can go to usps.com and canadapost.ca to check rates.

Shipping from Asia and even the UK is FAR cheaper.
by mikronauts
Thu Jan 16, 2014 2:10 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 'Interference' between UART and I2C
Replies: 8
Views: 2240

Re: 'Interference' between UART and I2C

Best guess: You are drawing too much power from the 3v3 supply. Measure the 5v and 3v3 rails.
by mikronauts
Tue Jan 14, 2014 9:59 pm
Forum: General discussion
Topic: Why mix arduino with raspberryPi
Replies: 20
Views: 5902

Re: Why mix arduino with raspberryPi

- analog inputs - more PWM - more digital I/O Hey guys ! As a beginner, I noticed many people mix arduinos and RPi, but I don't understand what does the arduino givess that the RPi doesn't have. It might sound like a stupid question to many, but well, I don't know the answer to it :D Thanks in advan...
by mikronauts
Wed Jan 08, 2014 6:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Serial Connection between Pi and Arduino
Replies: 11
Views: 3205

Re: Serial Connection between Pi and Arduino

Connect Arduino Tx to a 2k4 resistor, other side of that resistor to Pi Rx and a 4k7 resistor to ground. You can connect the Pi Tx to the Arduino Rx directly (an in-line 2k4 resistor won't hurt, but skip the resistor to ground) Above circuit was tested with 5V sensors on my SPRITE robot. thank you. ...
by mikronauts
Sat Jan 04, 2014 2:36 am
Forum: RISCOS
Topic: Ultrasonic rangefinding with Ping
Replies: 3
Views: 4038

Re: Ultrasonic rangefinding with Ping

Hi! I see that pigpio can handle this sort of thing based on William Henning's SPRITE article in the Jan 2014 Servo magazine. I hope you found my article useful. I was able to use the Sparkfun ultrasonic sensor easily with pigpio, the only gotchas involved not limiting the driving current too much a...
by mikronauts
Sun Dec 29, 2013 5:15 pm
Forum: Bare metal, Assembly language
Topic: XMOS multicore microcontroller dev board giveaway
Replies: 14
Views: 7918

Re: XMOS multicore microcontroller dev board giveaway

I received mine as well.

Looks like a nice board; it has I/O's that connect to most Pi I/O's (I think except #24 and #25 which are nc)
by mikronauts
Sun Dec 29, 2013 5:04 pm
Forum: General discussion
Topic: Raspberry Pi Expansion for Robot
Replies: 4
Views: 1356

Re: Raspberry Pi Expansion for Robot

Check out my article in the Jan 2014 Servo - I had a simple Pi robot in it, including obstacle avoidance. I am looking to integrate my Pi into a small wheeled robot I am working on. This would involve controlling some motors and receiving input from a number of sensors dedicated to object avoidance....
by mikronauts
Sun Dec 29, 2013 4:50 pm
Forum: Automation, sensing and robotics
Topic: Driving multiple servos from the RaspberryPi
Replies: 212
Views: 114949

Re: Driving multiple servos from the RaspberryPi

I've had great success with using the pigpio library to drive multiple servos - I used three in my SPRITE bot (Servo Jan.2014)
by mikronauts
Tue Dec 24, 2013 7:35 pm
Forum: Advanced users
Topic: Power from battery pack
Replies: 8
Views: 2788

Re: Power from battery pack

FYI,

I used a Patriot Fuel+ 5200 mAh pack to power a Rev.2 Pi + WiFi + robot controller wit great success (see SPRITE, Servo Jan.2014). The servos were powered off a different 4xAA battery pack.

The Pi ran for >3h with WiFi in this configuration.
by mikronauts
Sat Dec 21, 2013 9:24 pm
Forum: Beginners
Topic: More sensors running on Raspberry Pi
Replies: 4
Views: 1692

Re: More sensors running on Raspberry Pi

You need to add some digital I/O expanders and some analog to digital converters. Currently a Gertboard or Gertduino would be a good place to start, or a prototyping board with dip chips. Hello! I'm software developer and for the last two years I follow what's going on with Raspberry Pi. I've ordere...
by mikronauts
Sat Dec 21, 2013 12:50 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Driving 2 DC motors using L293D
Replies: 35
Views: 36787

Re: Driving 2 DC motors using L293D

WiringPi also has a soft PWM that can control multiple pins; I used it last week with a L293D - it would also work with the L298 How do you use the L298N H-Bridge to control two motors from one PWM pin on RPi ???? I probably wouldn't - see below. The little buggy in the picture is using an Arduino N...
by mikronauts
Sat Dec 21, 2013 12:42 am
Forum: Automation, sensing and robotics
Topic: SPRITE Pi based robot - cover + article in Jan 2014 Servo
Replies: 0
Views: 826

SPRITE Pi based robot - cover + article in Jan 2014 Servo

Hi, You may be interested in the Raspberry Pi based robot I wrote about in the January 2014 edition of Servo. I got the digital edition today, the dead-tree version should be hitting shelves right about now. Sprite is uses continuous rotation servos for locomotion, and an ultrasonic sensor for obsta...

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