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by GerryG
Sat Sep 30, 2017 7:27 pm
Forum: General discussion
Topic: 8 pin ribbon cable to breadboard
Replies: 3
Views: 926

Re: 8 pin ribbon cable to breadboard

Thanks for the reply. I just found and ordered a connector from ebay. http://www.ebay.com/itm/1pcs-8-Pin-0-5m ... 2749.l2649
by GerryG
Sat Sep 30, 2017 6:44 pm
Forum: General discussion
Topic: 8 pin ribbon cable to breadboard
Replies: 3
Views: 926

8 pin ribbon cable to breadboard

I have a LiDAR unit that connects with a 0.5mm 8 pin ribbon connector. I want to connect the unit to a breadboard for testing. I have looked on-line for connectors but they are really small and not likely to connect to a jumper wire. How do I connect the 8pin ribbon cable to my Pi?
by GerryG
Sun Jun 18, 2017 4:10 am
Forum: Troubleshooting
Topic: Fixed IP Address on a Fixed Address Router.
Replies: 0
Views: 338

Fixed IP Address on a Fixed Address Router.

I use to be able to SSH and VNC into my Pi but then I got a new internet provider. The new internet provider had wireless/firewall setting that busted my ability to connect remotely to my Pi. The internet provider had me fix the IP address settings on my router to avoid the firewall problems. I can ...
by GerryG
Sun Apr 16, 2017 3:07 am
Forum: General discussion
Topic: Light a Flashlight Bulb?
Replies: 5
Views: 1862

Re: Light a Flashlight Bulb?

The bulb will draw way more current than a RPI GPIO can handle. Those bulbs probably use close to 300mA maybe more. While an LED only uses a few mA. Incandescent bulbs don't usually need a resistor even so do NOT connect that bulb directly to your RPi GPIO. Thanks for the advice. I didn't connect t...
by GerryG
Sun Apr 16, 2017 2:41 am
Forum: General discussion
Topic: Light a Flashlight Bulb?
Replies: 5
Views: 1862

Re: Light a Flashlight Bulb?

Bad! An old school bulb like that requires far more current that the gpio can supply. Think if it this way - a weedwhacker can make plenty if rpms, but wouldn't move you car 60mph. So you'll need to use the gpio to switch relay or transistor. The relay or transistor can handle the current a bulb re...
by GerryG
Sun Apr 16, 2017 2:03 am
Forum: General discussion
Topic: Light a Flashlight Bulb?
Replies: 5
Views: 1862

Light a Flashlight Bulb?

I can turn on an LED with a Raspberry Pi Model B, a 330 ohm resistor and some basic Python code via the GPIO pin 27. I have swapped out the LED with a Mini-Mag brand Xenon bulb which typically runs in a flashlight using 2 each 1.5 volt batteries. The bulb will not light and I do not understand why. ...
by GerryG
Sat Feb 11, 2017 10:25 pm
Forum: Troubleshooting
Topic: Install libfreenect (Kinect 360) on a Raspberry Pi Make erro
Replies: 9
Views: 5584

Re: Install libfreenect (Kinect 360) on a Raspberry Pi Make

ktb wrote:That message probably means that you're missing a required lib dev package.

Check if it's installed with this command:

Code: Select all

apt-cache policy libxi-dev
Install it with this command:

Code: Select all

sudo apt-get install libxi-dev
I installed libxi-dev and get the same error.
by GerryG
Thu Feb 09, 2017 8:05 pm
Forum: Troubleshooting
Topic: Install libfreenect (Kinect 360) on a Raspberry Pi Make erro
Replies: 9
Views: 5584

Re: Install libfreenect (Kinect 360) on a Raspberry Pi Make

I don't see errors in Fix the errors listed in /home/pi/src/libfreenect-0.5.5/build/CMakeFiles/CMakeOutput.log . I do see errors in "/home/pi/src/libfreenect-0.5.5/build/CMakeFiles/CMakeError.log". Specifically this error. CMake Error: The following variables are used in this project, but they are s...
by GerryG
Thu Feb 09, 2017 2:22 am
Forum: Troubleshooting
Topic: Install libfreenect (Kinect 360) on a Raspberry Pi Make erro
Replies: 9
Views: 5584

Re: Install libfreenect (Kinect 360) on a Raspberry Pi Make

Here are the steps and the outputs as reported by the terminal window. Dougie, there is a cmake -L .. command before the make command. I added the log file output after the terminal window output and separated the log file with a line of ##### [email protected]:~ $ cd ~/src/libfreenect-0.5.5 [email protected]...
by GerryG
Wed Feb 08, 2017 4:49 pm
Forum: Troubleshooting
Topic: Install libfreenect (Kinect 360) on a Raspberry Pi Make erro
Replies: 9
Views: 5584

Install libfreenect (Kinect 360) on a Raspberry Pi Make erro

I am trying to install libfreenect on a Raspberry Pi using the instructions found here: http://blog.bitcollectors.com/adam/2016/01/kinect-support-for-raspberry-pi-using-libfreenect/ On step 4, line 8 when I run make I get the following error: *make: *** No targets specified and no makefile found. St...
by GerryG
Sun Oct 16, 2016 11:35 pm
Forum: General discussion
Topic: VNC Troubles
Replies: 3
Views: 722

Re: VNC Troubles

Try sudo netstat -tlnp | grep vnc and see what port it's listening on. [email protected]:~$ sudo netstat -tlnp | grep vnc tcp 0 0 0.0.0.0:5901 0.0.0.0:* LISTEN 2097/Xtightvnc tcp 0 0 0.0.0.0:6001 0.0.0.0:* LISTEN 2097/Xtightvnc [email protected]:~$ shows my Pi3B has a :1 session running. 5901 == :1 5902 ==...
by GerryG
Wed Aug 03, 2016 10:31 pm
Forum: Beginners
Topic: Reading a piezo sensor with Python
Replies: 3
Views: 8152

Re: Reading a piezo sensor with Python

While you can connect that device directly to a RPi GPIO configured as an output to produce vibrations (sound), I doubt you can use it as an input device without putting some electronics between it and the RPi. It is even possible it could cause fatal damage to a RPi if connected directly and expos...
by GerryG
Wed Aug 03, 2016 7:35 pm
Forum: Beginners
Topic: Reading a piezo sensor with Python
Replies: 3
Views: 8152

Reading a piezo sensor with Python

I have one of these piezo sensors (https://www.adafruit.com/product/1739). I would like to try to use it to detect whether water is flowing through a water line. The line moves a lot of water and you can feel the line vibrating. I am new to the Raspberry Pi (and Linux) but I have some Python skills....
by GerryG
Wed May 18, 2016 10:31 pm
Forum: Troubleshooting
Topic: Wifi trouble - wpa_supplicant help
Replies: 3
Views: 619

Re: Wifi trouble - wpa_supplicant help

Follow-up.
The dongle was not being recognized, updating the OS and using a new WiFi dongle solved the problem.
Thanks for everyone's suggestions.
by GerryG
Fri May 13, 2016 5:05 am
Forum: Troubleshooting
Topic: Why is config.txt being rewritten?
Replies: 2
Views: 499

Why is config.txt being rewritten?

I altered the overscan values on the /boot/config.txt a few days ago. I have had the Pi on and off a few times.
Today the overscan values are commented out and the the values are back to the default 16. Why did this happen?
by GerryG
Thu May 05, 2016 6:21 pm
Forum: Troubleshooting
Topic: Wifi trouble - wpa_supplicant help
Replies: 3
Views: 619

Wifi trouble - wpa_supplicant help

I have a Raspberry Pi B running Wheezy. The installation via NOOS is fresh, new, and updated. I have an official Raspberry Pi WiFi dongle connected to the rPi (that works fine in my 2B+). When I try to connect to WiFi I see that I get a "could not get status from wpa_supplicant" message in the WiFi ...
by GerryG
Thu May 05, 2016 4:34 pm
Forum: General discussion
Topic: Pi Camera Aerial Photograph Pixel Resolution Question.
Replies: 2
Views: 898

Re: Pi Camera Aerial Photograph Pixel Resolution Question.

I am interested in using the Raspberrry Pi and the Pi camera to collect aerial photographs from a fixed wing airplane. I want to get an idea of what the pixel resolution will be at different altitudes using a Raspberry Pi camera. For example, if I capture an image using a Pi camera at 305 meters of...
by GerryG
Wed May 04, 2016 4:31 pm
Forum: General discussion
Topic: Pi Camera Aerial Photograph Pixel Resolution Question.
Replies: 2
Views: 898

Pi Camera Aerial Photograph Pixel Resolution Question.

I am interested in using the Raspberrry Pi and the Pi camera to collect aerial photographs from a fixed wing airplane. I want to get an idea of what the pixel resolution will be at different altitudes using a Raspberry Pi camera. For example, if I capture an image using a Pi camera at 305 meters of ...
by GerryG
Mon May 02, 2016 6:35 pm
Forum: General discussion
Topic: Need High Accuracy Electronic Target using triangulation
Replies: 44
Views: 9411

Re: Need High Accuracy Electronic Target using triangulation

I don't see how this computer vision approach is more feasible than the audio DSP thingy ... ghans I guess it depends on your skill levels but this is strait-forward raster (matrix) math. I thinks all the functions are available in Python via Numpy. Take a picture of the target, shoot, take a pictu...
by GerryG
Thu Apr 28, 2016 11:12 pm
Forum: General discussion
Topic: Need High Accuracy Electronic Target using triangulation
Replies: 44
Views: 9411

Re: Need High Accuracy Electronic Target using triangulation

How about pointing a camera at the target and using image change detection to determine the position of the most recent pellet strike? That might be easier that working out the triangulations from sound. The sound of the pellet strike could trigger the change detection.
by GerryG
Wed Apr 27, 2016 3:07 pm
Forum: Troubleshooting
Topic: HDMI to VGA Adapter troubles
Replies: 2
Views: 472

Re: HDMI to VGA Adapter troubles

B.Goode wrote:I think it is worth considering the possibility that you may have a power supply problem that is interacting with your display issues and causing you confusion.

This is also covered in the troubleshooting link already referenced.
I get a random blink on ACT and a steady light on PWR.
by GerryG
Wed Apr 27, 2016 3:02 pm
Forum: Troubleshooting
Topic: Edit Config.txt on Ubuntu Permissions problem
Replies: 3
Views: 1315

Re: Edit Config.txt on Ubuntu Permissions problem

Please clarify whether the Operating System for your RPi was installed on the SD card using the NOOBS Installer, or by directly 'flashing' an image? The specific answer to your question will depend on what choice you made at that stage. I purchased/used an official Raspberry Pi SD card with Noobs. ...
by GerryG
Wed Apr 27, 2016 5:40 am
Forum: Troubleshooting
Topic: Edit Config.txt on Ubuntu Permissions problem
Replies: 3
Views: 1315

Edit Config.txt on Ubuntu Permissions problem

I want to alter the contents of the config.txt file but my rPi is AFU and I cannot see the desktop on the rPi anymore (the monitor does not display anything past the rainbow boot-up screen). I understand that there are lines in the config.txt that may hold the key to getting the display to work agai...
by GerryG
Wed Apr 27, 2016 3:22 am
Forum: Troubleshooting
Topic: HDMI to VGA Adapter troubles
Replies: 2
Views: 472

HDMI to VGA Adapter troubles

I recently switched to a VGA monitor. I have been using an HDMI to VGA adapter with my 2B+. Since using this adapter I have had (progressively) intermittent luck getting the desktop to display on the monitor. Sometimes during boot I get to the desktop, sometimes I have to reboot- unplug the cable an...
by GerryG
Tue Apr 26, 2016 5:23 pm
Forum: General discussion
Topic: Sense HAT wiring help-What GPIO pins go where?
Replies: 9
Views: 3113

Re: Sense HAT wiring help-What GPIO pins go where?

Aydan wrote:The HAT also needs PINS 27 & 28 for the HAT ID EEPROM, so that's 2 I2C buses.

Regards
Aydan

Thanks, Aydan,
For clarity-I should be able to run the SenseHat sensors and LEDs via a breadboard by connecting 5v, ground, i2C(SDA), i2C (SCL), and pins 27(EPROM), and 28 (EPROM)?

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