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by BAStumm
Thu Dec 18, 2014 10:26 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi Thermostat
Replies: 19
Views: 5006

Re: Raspberry Pi Thermostat

Man, you Brits can't have any fun can you... :lol: For what it is worth... I did state that no high voltage need connected in my example to demonstrate the switching of the SSR assuming the SSR chosen has a status LED to indicate on/off. I build industrial ovens for a living so I get to play with th...
by BAStumm
Tue Dec 16, 2014 9:39 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi Thermostat
Replies: 19
Views: 5006

Re: Raspberry Pi Thermostat

A solid state relay (SSR) can be switched directly from the Pi's 3v3 GPIO pins. By adding a temperature measuring device (for example a thermocouple or thermistor via i2c bus) you can turn the RPi into a thermostat and control a furnace (on/off) via the GPIO pins and the SSR. Many SSR's have an LED ...
by BAStumm
Fri Dec 05, 2014 9:31 pm
Forum: C/C++
Topic: Read a file and do somethings
Replies: 4
Views: 2657

Re: Read a file and do somethings

I thought beer was a universal language. ;)
by BAStumm
Mon Oct 20, 2014 11:22 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: How to protect GPIO from 12v Short?
Replies: 1
Views: 834

Re: How to protect GPIO from 12v Short?

Optocouplers.
by BAStumm
Mon Oct 20, 2014 4:45 pm
Forum: Automation, sensing and robotics
Topic: Pi in Industrial Applications
Replies: 8
Views: 4021

Re: Pi in Industrial Applications

I just shipped an industrial, conveyor oven that uses an RPi for I/O, I2C communication to heater controllers and a 20 inch touch screen for human interface. We plan to move to the compute module and build our own custom I/O+Relay+otherstuff type board for it to mount to. Touchscreen used is Dell E2...
by BAStumm
Fri Oct 17, 2014 2:59 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi K type Thermocouple intermittent wrong temps?
Replies: 8
Views: 2210

Re: Raspberry Pi K type Thermocouple intermittent wrong temp

I build industrial ovens and all we use is ungrounded. The problem is not just the sheath, if the braided insulation touches metal you get the same result with bad reads.
by BAStumm
Fri Oct 17, 2014 10:15 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi K type Thermocouple intermittent wrong temps?
Replies: 8
Views: 2210

Re: Raspberry Pi K type Thermocouple intermittent wrong temp

Grounded vs ungrounded thermocouples... you need ungrounded.
by BAStumm
Fri Oct 17, 2014 12:51 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi K type Thermocouple intermittent wrong temps?
Replies: 8
Views: 2210

Re: Raspberry Pi K type Thermocouple intermittent wrong temp

One other thing... 110C is 230F. Perhaps you are sometimes getting the temperature back in the wrong unit? I see the software for that device can return the value in either unit of measure.
by BAStumm
Fri Oct 17, 2014 12:46 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi K type Thermocouple intermittent wrong temps?
Replies: 8
Views: 2210

Re: Raspberry Pi K type Thermocouple intermittent wrong temp

Bad read of the T/C or noise on the I2C bus perhaps? I'm working on a similar project using the olimex mod-tc-mk2-31855 which also is accessed via I2C (From an RPi). I also get random values that I know are wrong. You can try to improve communication but at the end of the day you will likely need to...
by BAStumm
Wed Oct 15, 2014 5:56 pm
Forum: Automation, sensing and robotics
Topic: Protect GPIO Inputs and Outputs
Replies: 1
Views: 745

Re: Protect GPIO Inputs and Outputs

In my opinion, something lacking in add-on boards for RPi is optocoupling for the GPIO pins. I realize it is hard to envision what one might do with the RPi P1 Header pins but having protection via an addon board for at least some of the pins makes sense to me. Other things you might consider are an...
by BAStumm
Wed Oct 15, 2014 3:15 pm
Forum: C/C++
Topic: GLib-GObject-WARNING
Replies: 6
Views: 8531

Re: GLib-GObject-WARNING

Guess I better stick with my previous version for now. Has there been any word at all about fixes and timing?
by BAStumm
Tue Oct 14, 2014 7:30 pm
Forum: C/C++
Topic: GLib-GObject-WARNING
Replies: 6
Views: 8531

GLib-GObject-WARNING

I just downloaded the latest September 9 2014 Raspbian image. Prior to this I have been using a version from January 7 of 2014. I have an application I wrote that uses Gtk+-2.0 and now I am getting many warnings that I did not get previously. Nothing in my software changed. I notice I now have a new...
by BAStumm
Wed Oct 08, 2014 3:14 pm
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 186518

Re: Touchscreens for Raspberry Pi

Plug and play. At least that is the case with Raspbian. Uses hid_multitouch driver.
by BAStumm
Sat Oct 04, 2014 1:15 am
Forum: General discussion
Topic: I2C on Raspberry Pi
Replies: 14
Views: 4002

Re: I2C on Raspberry Pi

I/O Pi from AB Electronics UK uses two mcp23017 chips (default 0x20 and 0x21) which is supported by wiringPi. I am using this board in my project and it works fine. My code is written in C. I've not had a seg fault ever and have been running for at least a month and at least 5 or more hours per day....
by BAStumm
Wed Oct 01, 2014 5:27 pm
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 186518

Re: Touchscreens for Raspberry Pi

You might see what dell is offering in that range. There are at least two of us using Dell e2014t touchscreen monitors and they work great. These are 19.5" though.
by BAStumm
Tue Sep 30, 2014 1:08 am
Forum: C/C++
Topic: wiringPiISR
Replies: 5
Views: 2842

Re: wiringPiISR

No change found based on your suggested code changes to wiringPi.c, I don't believe the two are connected. Bench testing does not generate the same results (ie it works on the bench) so I'm thinking this is a wiring or noise related problem for the real life version. There are many other things goin...
by BAStumm
Mon Sep 29, 2014 9:49 pm
Forum: C/C++
Topic: wiringPiISR
Replies: 5
Views: 2842

Re: wiringPiISR

Will test your changes soon and report back.
by BAStumm
Mon Sep 29, 2014 9:44 pm
Forum: C/C++
Topic: wiringPiISR
Replies: 5
Views: 2842

Re: wiringPiISR

Apparently this has been answered by Gordon before... // disable interrupts system ("/usr/local/bin/gpio edge pin none") ; // allow them again: system ("/usr/local/bin/gpio edge pin rising") ; But apparently my problem lies deeper. I'm getting thousands of false triggers per seco...
by BAStumm
Mon Sep 29, 2014 8:17 pm
Forum: C/C++
Topic: wiringPiISR
Replies: 5
Views: 2842

wiringPiISR

Hi, Question, how do you remove/disable wiringPiISR once created? Real Problem... Having a little trouble with a quadrature encoder. I am using wiringPiISR to register a function (same function) for both the A and B Pins. When the encoder is moving things are fine. When the encoder is stopped it can...
by BAStumm
Wed Sep 24, 2014 6:00 pm
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 186518

Re: Touchscreens for Raspberry Pi

I've still had occasional problems with the matchbox keyboard coming up very, very small... I've increased the sleep time to 5 in my bash script below. Hoping that helps. Initially I had some trouble with autostarting matchbox-keyboard after startx, the keyboard was TINY and not usable. I've worked ...
by BAStumm
Thu Sep 18, 2014 6:15 pm
Forum: Other projects
Topic: superhuman suit
Replies: 12
Views: 3424

Re: superhuman suit

This will TOTALLY be my next project... As soon as I finish my RPi based perpetual motion machine ;)
by BAStumm
Tue Sep 16, 2014 4:06 pm
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 186518

Re: Touchscreens for Raspberry Pi

I will explore this as soon as I have the ability. Right now I am unable to test. I can tell you that password fields in my proprietary software works as expected. My project does not require use of a web browser so I have no experience with the matchbox-keyboard and internet sites. Will update as s...
by BAStumm
Tue Sep 02, 2014 6:13 pm
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 186518

Re: Touchscreens for Raspberry Pi

The Desktop Login password field or a password you enter into the chromium browser? Matchbox-keyboard doesn't start until after the user has logged into the RPi based on the way I am starting it so no keyboard for desktop login.
by BAStumm
Wed Aug 20, 2014 4:31 pm
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 186518

Re: Touchscreens for Raspberry Pi

I can confirm same behavior here but have no answers unfortunately. Will investigate and report my findings.
by BAStumm
Tue Aug 19, 2014 5:31 pm
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 186518

Re: Touchscreens for Raspberry Pi

Initially I had some trouble with autostarting matchbox-keyboard after startx, the keyboard was TINY and not usable. I've worked around this by adding a delay to the start of the keyboard. Edit a file /home/pi/.config/autostart/matchbox-keyboard.desktop to have the following: [Desktop Entry] Type=Ap...

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