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by Ferdinand
Thu Jul 30, 2015 3:42 pm
Forum: General discussion
Topic: Wireless Dongle For Raspberry Pi
Replies: 2
Views: 537

Re: Wireless Dongle For Raspberry Pi

Hi thegr8one,

I use a WiPi dongle.
Ralink Technology Corp. RT5370 wireless adapter. It works out of the box.
by Ferdinand
Thu Jul 30, 2015 11:26 am
Forum: Beginners
Topic: Failed to bring up wlan0
Replies: 25
Views: 24361

Re: Failed to bring up wlan0

Hi avalloneandrea, -Did you test your dongle in an another computer? -Test your sd card if it is not faked. Search for fake sdcard. -use an another usb port or better use a rpi certified powered usb hub (~2 amp) -reinstall your image and log every step -disconnect eth0 cable if not in use!! -see las...
by Ferdinand
Wed Jul 29, 2015 10:57 pm
Forum: Beginners
Topic: Failed to bring up wlan0
Replies: 25
Views: 24361

Re: Failed to bring up wlan0

Hi,

The settings are ok.
I think that you installed a wrong or an outdated driver for your dongle.
Did you install new drivers?
Please send model/type of your dongle.
by Ferdinand
Wed Jul 29, 2015 10:53 am
Forum: Beginners
Topic: Failed to bring up wlan0
Replies: 25
Views: 24361

Re: Failed to bring up wlan0

Hi avalloneandrea,

Replace wireless/power by wireless-power or disable this option by placing a # in front off a line.
by Ferdinand
Mon Jul 27, 2015 6:02 pm
Forum: Troubleshooting
Topic: Wi-Fi drops when ethernet unplugged
Replies: 2
Views: 502

Re: Wi-Fi drops when ethernet unplugged

Hi tommylovell,

Try this:
Replace wpa-conf by wpa-roam.
by Ferdinand
Sun Jul 26, 2015 9:53 am
Forum: Automation, sensing and robotics
Topic: Sensing a Human
Replies: 5
Views: 1746

Re: Sensing a Human

Hi tomtalk24, You can use a strain gauge weight detector used in bathroom scales see: https://www.sparkfun.com/products/10245 Place the sensor under a bed leg and use an analog to digital converter to measure the force if you in or out of the bed. You can also use a co2 sensor (tgs2600) to measure t...
by Ferdinand
Sun Jul 26, 2015 8:24 am
Forum: Troubleshooting
Topic: Wireless Adapter
Replies: 4
Views: 689

Re: Wireless Adapter

Hi Kevinbaines, Buy an approved Raspberry Pi adapter such as a WiPi dongle. It works out of the box. If your dongle does not work you will have to install drivers. And that's the hard way. A good starting point is: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=44044&sid=06f6500e842ab33eda6...
by Ferdinand
Sat Jul 25, 2015 9:02 am
Forum: Advanced users
Topic: Detect USB amp
Replies: 5
Views: 924

Re: Detect USB amp

Hi Polvo, You said that the amp is powered by 2 power wires. The pam8403 is not a usb device, so lsusb does not work. You can control your amplifier by a voltage regulator or 'power fet' in front off your power amp. The regulator / power fet can be controlled by your Pi. Another methode is; monitor ...
by Ferdinand
Mon Jul 20, 2015 6:36 am
Forum: Advanced users
Topic: Backup from a USB card reader
Replies: 6
Views: 1112

Re: Backup from a USB card reader

Hi Dragon12,

You will find all answers here:
http://softwarebakery.com/shrinking-images-on-linux
by Ferdinand
Tue Jun 09, 2015 6:51 pm
Forum: Beginners
Topic: Programming- Detecting Current Through Circuit
Replies: 6
Views: 2410

Re: Programming- Detecting Current Through Circuit

Hi,

Instead of measuring a current you can measure a voltage.
Perhaps the link below will help you a little bit.

viewtopic.php?f=91&t=74914
by Ferdinand
Wed Jun 03, 2015 1:41 pm
Forum: General discussion
Topic: Restoring microSD
Replies: 7
Views: 1591

Re: Restoring microSD

Hi DRD,

Use your camera or cellphone to format your micro sd card.
by Ferdinand
Sat Dec 27, 2014 12:06 pm
Forum: Bare metal, Assembly language
Topic: assembly language programming
Replies: 7
Views: 3861

Re: assembly language programming

I use Midnight Commander and it contains an editor. Why do you use an assembler for? If you are an assembler goeroe then go for it, otherwise coding is very hard. For (complex) functions you can better use c/c++. Its is better to maintain and it is part of the raspian wheezy image. If speed is not r...
by Ferdinand
Tue Nov 18, 2014 3:57 pm
Forum: Gaming
Topic: Cloning an SD card Image
Replies: 7
Views: 1131

Re: Cloning an SD card Image

by Ferdinand
Fri Nov 07, 2014 1:06 pm
Forum: Automation, sensing and robotics
Topic: Problem with LIRC
Replies: 5
Views: 1081

Re: Problem with LIRC

Hi Guussie, Is the frequency of 38 KHz, receiver and IR diode, OK? No broken parts? Did you update your software / kernel? Do the components match eachother? Current flowing through IR diode? See links below: http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=83452 http://www.raspberrypi.org/for...
by Ferdinand
Mon Nov 03, 2014 11:26 am
Forum: Beginners
Topic: C code to read GPIO input
Replies: 7
Views: 6937

Re: C code to read GPIO input

Hi Kiloleader, As you already know, C is 1000 times faster then Python. I had more or less the same problem with the DTH11 humidity sensor. You have to modify the code for your application, but it is a starting point. Do not run this program for your application, because I use the gpio pin for readi...
by Ferdinand
Mon Oct 27, 2014 2:09 pm
Forum: Beginners
Topic: Sensor not working on startup
Replies: 9
Views: 1468

Re: Sensor not working on startup

If the distance between the rpi and tx23 is a couple of meters than consider the use of a thri state line driver or open collector integrated circuit. A line driver 'eliminates' the cable capacitance. A short pulse will not distort. Use a real oscilloscope to see shape/timing differences between sho...
by Ferdinand
Mon Oct 27, 2014 1:25 pm
Forum: Beginners
Topic: Sensor not working on startup
Replies: 9
Views: 1468

Re: Sensor not working on startup

Hi Pattagghiu, It looks like a timing problem. A timing problem can be caused by a long cable. For testing: connect the rpi with a short cable ~50 cm to the tx23 and watch with an real oscilloscope the start signal (to the tx23) and data signals (from tx23). Then use a long cable ~10 m, and watch sp...
by Ferdinand
Fri Oct 17, 2014 10:32 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: two IR sensors using I2c to pi
Replies: 5
Views: 2196

Re: two IR sensors using I2c to pi

Is it possible to connect 2 IR sensors to the pi, with the same I2C address ? Yes it is possible according AN262: I2C Multiplexing - Some specialized devices only have one I2C or SMBus address and sometimes several identical devices are needed in the same system. The multiplexers and switches split ...
by Ferdinand
Thu Oct 16, 2014 10:10 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: two IR sensors using I2c to pi
Replies: 5
Views: 2196

Re: two IR sensors using I2c to pi

Hi Bobdxcool,

You have to use a multiplexer in this case. See this link:
http://blogs.msdn.com/b/laurelle/archiv ... etter.aspx

There is also an application note available, google on AN262.

Succes with your project,
...fjk
by Ferdinand
Tue Oct 14, 2014 8:19 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C project with multiple slaves
Replies: 1
Views: 779

Re: I2C project with multiple slaves

Hi DakByte, All your questions can be found in this pdf file. http://www.nxp.com/documents/application_note/AN10216.pdf See slide 33 and further. The command sudo i2cdetect -y 1 shows all connected devices / slave controllers. If you have any questions I will watch your post. Succes with your projec...
by Ferdinand
Wed Oct 01, 2014 9:17 am
Forum: Other projects
Topic: RPI as a Telemetry unit
Replies: 3
Views: 1443

Re: RPI as a Telemetry unit

Hi Ctopliff,

I found an article in Raspi magazine about a drone.
The name of that article is: "how to program a drone".
Just google raspi magazine. It's a e-magazine found in the AppStore.

Succes with your project.
...fjk

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