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by mikronauts
Mon Nov 18, 2013 9:39 pm
Forum: General discussion
Topic: Powering RPi AND extension
Replies: 1
Views: 434

Re: Powering RPi AND extension

Short answer - as long it can provide enough current for both your Pi and expansion board, yes. Long answer - relays, motors etc can cause significant disturbances to the shared 5V due to sudden large current draws. You can mitigate that to some extent with large capacitors and inductors, however if...
by mikronauts
Mon Nov 18, 2013 3:16 am
Forum: Staffroom, classroom and projects
Topic: Teaching BTEC Level 3 IT Computer Control Unit
Replies: 8
Views: 3591

Re: Teaching BTEC Level 3 IT Computer Control Unit

Hi, I am in the process of developing educational (hardware) products for the Pi, and as I am based in Canada I am not familiar with British computing / electronics courses. If you happen to have a pointer to a site where I can download descriptions of these courses, I'd really appreciate a link :) ...
by mikronauts
Mon Nov 18, 2013 2:49 am
Forum: Automation, sensing and robotics
Topic: Controlling motors and servos simultaneously
Replies: 8
Views: 2131

Re: Controlling motors and servos simultaneously

Hi, If you can control the two rear motors independently, you could use "skid steering" and replace the servo with a caster. I just built a small Pi robot with two continuous rotation servos and it works like a champ (with small casters), and I have built robots in the past using skid steering with ...
by mikronauts
Sat Nov 16, 2013 4:47 pm
Forum: General discussion
Topic: FPGA add-on
Replies: 8
Views: 2261

Re: FPGA add-on

Hi Tim,

Looks like a nice board; and I have been meaning to try the Lattice FPGA's.

Does that $22 for shipping cover shipping to Canada?

What kind of shipping is it? (ie how long would it take to arrive)

Thanks,

Bill
by mikronauts
Fri Nov 15, 2013 10:55 pm
Forum: Automation, sensing and robotics
Topic: PWM for servos, motors, and LEDs plus plus
Replies: 71
Views: 41238

Re: PWM for servos, motors, and LEDs plus plus

joan,

Thanks for pigpio.

I am using it on my Pi robots, and it works like a charm.
by mikronauts
Wed Nov 13, 2013 3:22 pm
Forum: General discussion
Topic: Let me get this straight about servos & motors...
Replies: 24
Views: 5533

Re: Let me get this straight about servos & motors...

No.

If you stop sending the control pulse:

- a standard servo will stay in the last position it was in (unless weight on the servo horn drags it down)
- a continuous rotation servo will stop turning
mrpi64 wrote:Do servos normally return back to their original position without prompt?
by mikronauts
Wed Nov 13, 2013 3:13 am
Forum: General discussion
Topic: Which Motor Controller should I buy?
Replies: 2
Views: 586

Re: Which Motor Controller should I buy?

Make sure your motor controller can handle the stall current of your motor.
by mikronauts
Fri Oct 25, 2013 4:36 pm
Forum: General discussion
Topic: Device which shuts down the Raspberry Pi if Voltage is low
Replies: 23
Views: 12787

Re: Device which shuts down the Raspberry Pi if Voltage is l

Exactly like that! I tend to use MCP3008 ADC's where I don't need more than 10 bits of resolution, and the MCP3208 where I do instead of the two or four input versions - more inputs never hurt :) Something similar to this? Controlled shutdown duration test of Pi model A with 2 cell lipo http://raspi...
by mikronauts
Fri Oct 25, 2013 12:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SPI driver latency and a possible solution
Replies: 241
Views: 136781

Re: SPI driver latency and a possible solution

This sounds great! I must admit that I am new to low level programming on the Pi, so I will likely ask a lot of elementary questions in the near future. Initially I will be using MCP3008/3208 and MCP23S17's, however other chips are on the horizon. I will be keeping a careful eye on this thread - tha...
by mikronauts
Thu Oct 24, 2013 11:59 pm
Forum: General discussion
Topic: Small Screen for Pi?
Replies: 5
Views: 10039

Re: Small Screen for Pi?

I am still not sure if you are looking for NTSC/PAL or flex cable LCD. For NTSC/PAL, look on ebay for NTSC montor or security monitor. For flex cable LCD, we have to wait for the foundation or someone to figure out what LCD's are compatible. Of course I was wondering where I could find one of these ...
by mikronauts
Thu Oct 24, 2013 3:10 am
Forum: General discussion
Topic: Q: List of recommended sensors?
Replies: 2
Views: 2364

Re: Q: List of recommended sensors?

Before you can read the sensors, you will need an analog to digital converter. You can use a Gertboard, Arduino, or many other solutions. I want my Raspi to process data from several sensors, such as temperature , brightness , uv-light intensity , air humidity and so on. Those sensors should be conn...
by mikronauts
Thu Oct 24, 2013 3:05 am
Forum: General discussion
Topic: Device which shuts down the Raspberry Pi if Voltage is low
Replies: 23
Views: 12787

Re: Device which shuts down the Raspberry Pi if Voltage is l

Instead of monitoring the Pi's 5V or 3V3 rail, I'd monitor the raw battery voltage (divided down to something an analog input on an ADC or microcontroller can read) and write a daemon to do a shutdown when the battery voltage drops too low. Well, to be honest, in my project I don't need a big accura...
by mikronauts
Thu Oct 24, 2013 2:59 am
Forum: General discussion
Topic: Small Screen for Pi?
Replies: 5
Views: 10039

Re: Small Screen for Pi?

Do you mean the flex cable connection? I am not aware of support for that yet.

Many have used the Pi with small NSTC/PAL and hdmi monitors.
by mikronauts
Sat Sep 07, 2013 12:56 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Can we come up with a Standard Plug/Socket for I2C
Replies: 27
Views: 5775

Re: Can we come up with a Standard Plug/Socket for I2C

The I2C pin out I use on my existing (and future) products is: 3v3 SDA SCL GND A number of people are developing I/O devices - some directly using I2C straight out of the GPIO pins but others are building boards and then expsoing I2C pins so that further devices can be added. I was wondering if we c...
by mikronauts
Mon Jun 10, 2013 6:33 pm
Forum: HATs and other add-ons
Topic: "official" dimensioned drawing
Replies: 4
Views: 5432

Re: "official" dimensioned drawing

Thanks Jon!

PM sent...
by mikronauts
Mon Jun 10, 2013 4:09 pm
Forum: HATs and other add-ons
Topic: "official" dimensioned drawing
Replies: 4
Views: 5432

Re: "official" dimensioned drawing

Thanks Jon! I checked the RS Components site - a lot of good information there. I did not explore that site before as I am in Canada and buy Pi's from Element14/Newark. Unfortunately the files for the proto board are off-line. I found some Eagle files on Adafruit, however they cannot be read by my E...
by mikronauts
Sat Jun 08, 2013 11:22 pm
Forum: HATs and other add-ons
Topic: "official" dimensioned drawing
Replies: 4
Views: 5432

"official" dimensioned drawing

Hi Guys, I've been having a blast with my Pi's, and it is time for me to make some boards for the Pi... After quite a bit of Googling, I've found some unofficial dimensions, png's, etc., and an official schematic... BUT I can't seem to find an official dimensioned drawing showing "official" mounting...
by mikronauts
Thu Feb 14, 2013 2:34 pm
Forum: General discussion
Topic: RaspBerry Pi(e) Model C (imaginations & wants)
Replies: 431
Views: 150700

Re: RaspBerry Pi(e) Model C (imaginations & wants)

Regarding a possible model C, the cost should be kept low, which limits what can reasonably be added I've been having a blast playing with my pi's, but I have run into some limitations - which could easily be solved with more USB ports. 1) Lack of WiFi: it is easy to add a dongle, but that leaves on...
by mikronauts
Sat Jan 05, 2013 7:44 pm
Forum: User groups and events
Topic: Vancouver Canada
Replies: 17
Views: 15537

Re: Vancouver Canada

I am located in Langley, BC :D

Just received my pi's yesterday, so I have been downloading today... and joining the forum.

I wanted to try the pi's as tiny, low power Linux boxes.

Bill
http://Mikronauts.com

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