Go to advanced search

by rzusman
Sun Apr 24, 2016 4:30 pm
Forum: Python
Topic: Break error
Replies: 6
Views: 900

Re: Break error

Are you indented correctly?
by rzusman
Sat Apr 23, 2016 3:38 pm
Forum: General discussion
Topic: Choosing the correct DIGI+ Board. HifiBerry interrupting.
Replies: 22
Views: 4058

Re: diy powersupply interrupting

It's NOT the power supply dropping out!

I don't understand why everyone is focused on that - if the power supply was dropping out, the Pi would reboot or hang.
The OP has already stated that this isn't happening.
by rzusman
Fri Apr 22, 2016 11:49 pm
Forum: Advanced users
Topic: How is 3V GPIO usable?
Replies: 13
Views: 3915

Re: How is 3V GPIO usable?

You need to use a transistor or a FET to drive the relay from the port pin.
There are a million posts on this subject - search for it.
by rzusman
Fri Apr 22, 2016 7:41 pm
Forum: General discussion
Topic: Choosing the correct DIGI+ Board. HifiBerry interrupting.
Replies: 22
Views: 4058

Re: diy powersupply interrupting

Ive had off-the-shelf 5V 2A psu, and it did the same. Thats why I tried the DIY way. The pi has a HiFiBerry Digi+ connected and its streaming to DAC via coaxial connection. The interruptions last maybe 1 seconds, and then it resume playing music. no reboot. The pi is playing from USB stick atached ...
by rzusman
Thu Apr 21, 2016 10:20 pm
Forum: General discussion
Topic: Choosing the correct DIGI+ Board. HifiBerry interrupting.
Replies: 22
Views: 4058

Re: diy powersupply interrupting

Does the Pi actually reboot?
by rzusman
Mon Apr 18, 2016 11:04 pm
Forum: Python
Topic: Why is python loop so slow comparing to arduino main loop?
Replies: 15
Views: 3408

Re: Why is python loop so slow comparing to arduino main loo

You shouldn't be using a loop for precise timing anyway...
by rzusman
Sun Apr 17, 2016 7:22 pm
Forum: C/C++
Topic: C programming Language before C++
Replies: 19
Views: 2959

Re: C programming Language before C++

What do you want, exactly?
by rzusman
Fri Apr 15, 2016 6:29 pm
Forum: Advanced users
Topic: Cross-compiling the Kernel from Mac
Replies: 9
Views: 3185

Re: Cross-compiling the Kernel from Mac

A friend of mine has developed an Xcode cross-complier toolchain for the Pi,. which I am using to do my Pi Compute Module development on.
It works great, but I'm not sure what wrinkles compiling the Kernel throws in.

It's based on the this:
http://www.jaredwolff.com/toolchains/
by rzusman
Fri Apr 15, 2016 12:49 pm
Forum: Compute Module
Topic: Making a custom 'motherboard'
Replies: 19
Views: 5163

Re: Making a custom 'motherboard'

sonium wrote:Are there also any through-hole mounted ZIF connectors for the camera cable?
I really doubt it.
by rzusman
Thu Apr 14, 2016 4:44 am
Forum: General discussion
Topic: Shift register
Replies: 14
Views: 2737

Re: Shift register

Just read the data sheet:
https://www.nxp.com/documents/data_shee ... HCT595.pdf

A rising edge on STCP with /OE low and /MR high clocks the data in the shift register to the outputs.
by rzusman
Thu Apr 14, 2016 4:29 am
Forum: General discussion
Topic: Shift register
Replies: 14
Views: 2737

Re: Shift register

Just look for a shift register with a strobe, like so:
http://www.ti.com/lit/ds/symlink/tlc6c5912-q1.pdf (they call it a "Register Clock" here).
by rzusman
Thu Apr 14, 2016 3:32 am
Forum: Beginners
Topic: How does some one become a competent programmer?
Replies: 73
Views: 11098

Re: How does some one become a competent programmer?

Depends on what you are doing. Honestly, you've raised so many threads about what language go learn etc., just do it! Learn Python. I have nightmares when these trisisters get put in CPU's . ?10 how the heck do you program that? Only thing I can think of would be a 3 option case statement in assemb...
by rzusman
Thu Apr 14, 2016 1:46 am
Forum: Compute Module
Topic: HELP! RPi-Compute won't boot after downgrading Firmware!
Replies: 6
Views: 1694

Re: HELP! RPi-Compute won't boot after downgrading Firmware!

Only if you know exactly what you are doing. Right now, the standard way of getting an OS onto the Compute Module is to use 'dd' to copy if block-by-block. If you knew exactly where the OS ended (and none of your apps/data resided in those low blocks), you could just dd that amount of data onto it. ...
by rzusman
Thu Apr 14, 2016 12:46 am
Forum: Compute Module
Topic: HELP! RPi-Compute won't boot after downgrading Firmware!
Replies: 6
Views: 1694

Re: HELP! RPi-Compute won't boot after downgrading Firmware!

Firmware?
The compute module gets flashed with an OS, like Raspbian.
Just download a suitable OS, and flash it to the CM - I use Minibian (it's lightweight, so it doesn't take forever to download or flash).
by rzusman
Tue Apr 12, 2016 6:04 pm
Forum: Raspberry Pi OS
Topic: No such File directory (MAC os)
Replies: 4
Views: 2669

Re: No such File directory (MAC os)

OP - Did you know that the Terminal supports drag-and-drop in OS X?
If you can SEE the file, just drag and drop it onto the terminal window after "if=" and it will fill the path in for you.
by rzusman
Tue Apr 12, 2016 5:30 am
Forum: General discussion
Topic: Pressure Detection System
Replies: 3
Views: 832

Re: Pressure Detection System

You need an Analog to Digital converter. There are many of them. One that is popular around here is the MCP3008: https://www.adafruit.com/product/856 The simplest way to convert 4-20mA to a voltage that the A/D can read is to pass it through a resistor - 100Ω will give you .4V-2.0V, which is a reaso...
by rzusman
Mon Apr 11, 2016 2:58 am
Forum: Automation, sensing and robotics
Topic: Land line call log
Replies: 5
Views: 2112

Re: Land line call log

by rzusman
Mon Apr 11, 2016 2:54 am
Forum: Advanced users
Topic: Detecting power down sequence end
Replies: 15
Views: 4894

Re: Detecting power down sequence end

For Jessie put an executable file in.. /lib/systemd/system-shutdown/ It will get executed at the end of a system shutdown. The shutdown 'type' will also be passed as the first argument to this script.. "poweroff" or "halt" etc... if needed by your script. I use this method to tr...
by rzusman
Sun Apr 10, 2016 5:28 pm
Forum: General discussion
Topic: stepup vs stepdown regulators?
Replies: 4
Views: 1508

Re: stepup vs stepdown regulators?

That's only because the batteries have less capacity.
In general, buck converters are slightly simpler and more efficient than boost converters, but the choice will depend on your situation.
by rzusman
Sun Apr 10, 2016 4:55 pm
Forum: Troubleshooting
Topic: Lirc problem
Replies: 18
Views: 3206

Re: Lirc problem

create rc_log in root (touch /root/rc_log) then try adding echo "About to start irexec\n" > /root/rc_log before /etc/init.d/lirc irexec -d /root/.lircrc and echo "Finished launching irexec\n" > /root/rc_log after and see if both commands end up in the log. You can also add: exec ...
by rzusman
Sun Apr 10, 2016 4:20 pm
Forum: Troubleshooting
Topic: Lirc problem
Replies: 18
Views: 3206

Re: Lirc problem

Hang on.

Is your listing of rc.local a full listing?

Because, if so, it's not a valid script.

It's missing
#! /bin/sh -e

as the first line.
by rzusman
Sun Apr 10, 2016 3:53 pm
Forum: Troubleshooting
Topic: Lirc problem
Replies: 18
Views: 3206

Re: Lirc problem

Are you sure rc.local is being executed?
Test it.
Is it marked as executable (chmod +x)?
by rzusman
Sun Apr 10, 2016 3:13 pm
Forum: Troubleshooting
Topic: Lirc problem
Replies: 18
Views: 3206

Re: Lirc problem

is 'root' an actual directory? (Neither of my Pis have a /root directory)

Where is .lircrc located?
by rzusman
Sun Apr 10, 2016 2:23 am
Forum: Troubleshooting
Topic: Lirc problem
Replies: 18
Views: 3206

Re: Lirc problem

What does your rc.local look like?
by rzusman
Sat Apr 09, 2016 4:59 pm
Forum: C/C++
Topic: One thread got stuck
Replies: 12
Views: 2257

Re: One thread got stuck

is readWifi() thread safe?

Where is this defined?

Go to advanced search