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by liudr
Tue Jul 26, 2016 7:22 pm
Forum: Beginners
Topic: Pi Zero Analog Audio
Replies: 11
Views: 4246

Re: Pi Zero Analog Audio

Yes, the circuit is needed for better sound quality. Try results without the circuit with a head phone. I didn't construct this myself so I'm thinking theoretically that it would sound awful without the circuit.
by liudr
Tue Jul 26, 2016 4:21 pm
Forum: Beginners
Topic: Wrong place, wrong question? GPS dongle/SW?
Replies: 7
Views: 1510

Re: Wrong place, wrong question? GPS dongle/SW?

FYI, this one I bought from ebay works out of the box with gpsd (had to uninstall it from systemd though, and manually start it): http://www.ebay.com/itm/Ublox-Gmouse-Glonass-GPS-USB-Receiver-Locator-Windows-10-8-7-vista-Google-Earth-/152017177167?hash=item2364ee0a4f:g:YGQAAOSwoudW-5Ox It gets decen...
by liudr
Tue Jul 26, 2016 3:43 pm
Forum: Beginners
Topic: Pi Zero Analog Audio
Replies: 11
Views: 4246

Re: Pi Zero Analog Audio

The jacks on your picture are too fuzzy to tell if they have plug insertion detection. If they only have 3 metal tabs, then no. If they have 5 tabs, then yes. Go back to the adafruit tutorial that fruitoftheloom posted: https://learn.adafruit.com/introducing-the-raspberry-pi-zero/audio-outputs The c...
by liudr
Tue Jul 26, 2016 3:08 pm
Forum: Beginners
Topic: Basic questions to OS
Replies: 9
Views: 1681

Re: Basic questions to OS

Which script on what web page?
by liudr
Mon Jul 25, 2016 3:47 pm
Forum: Off topic discussion
Topic: ArduCAM with Broadcom BCM2835 SoC
Replies: 40
Views: 7553

Re: ArduCAM with Broadcom BCM2835 SoC

It would be interesting to see someone de-solder the SoC :shock: It is not all that difficult but a soldering iron does not come in handy. Have in mind you are de-soldering in the hope to not damage it and resolder it to another board (after cleaning and reballing). It is fairly doable only to thos...
by liudr
Mon Jul 25, 2016 12:04 am
Forum: Beginners
Topic: raspberry pi 2 B model + RPI GSM ADD-on v2.0
Replies: 7
Views: 2983

Re: raspberry pi 2 B model + RPI GSM ADD-on v2.0

I have not done SMS myself (maybe sometime soon) but there should be some online tutorials if you search the right keywords. For now, you need a cheap SIM card for your purpose. It depends on your area. Do some search around and find something you can easily afford (best to have some google hits wit...
by liudr
Sun Jul 24, 2016 7:28 pm
Forum: Beginners
Topic: Compass + GPS Module Interference?
Replies: 6
Views: 1784

Re: Compass + GPS Module Interference?

drgeoff wrote: Probably not a problem in the specific case queried by the OP but not a reliable rule everywhere.
Just to correct me I guess, with a missing "only"?!
by liudr
Sun Jul 24, 2016 6:11 am
Forum: Automation, sensing and robotics
Topic: Cellular & GPS Enabled Pi Zero: Fona + Pi Zero
Replies: 1
Views: 1237

Re: Cellular & GPS Enabled Pi Zero: Fona + Pi Zero

I've thought about using FONA myself but it needs a lipo battery and more programmingis really more convenient to use a 3G dongle and a GPS dongle. It will need a USB hub though.
by liudr
Sun Jul 24, 2016 1:20 am
Forum: Troubleshooting
Topic: Problem with apt-get. HELP!
Replies: 7
Views: 1281

Re: Problem with apt-get. HELP!

Do you have an Internet connection?
by liudr
Sun Jul 24, 2016 12:47 am
Forum: Beginners
Topic: TFT LCD Screen Drivers
Replies: 2
Views: 574

Re: TFT LCD Screen Drivers

Find a good video explaining how to connect and lcd_clear to raspberry pi model B. That will tell you how to make the connection.
by liudr
Sun Jul 24, 2016 12:40 am
Forum: Beginners
Topic: Compass + GPS Module Interference?
Replies: 6
Views: 1784

Re: Compass + GPS Module Interference?

No. They both receive signals so no interference.
by liudr
Sat Jul 23, 2016 9:18 pm
Forum: Beginners
Topic: raspberry pi 2 B model + RPI GSM ADD-on v2.0
Replies: 7
Views: 2983

Re: raspberry pi 2 B model + RPI GSM ADD-on v2.0

Provide a link to the GSM add-on and each sensor. Are you sure that you only want to SMS to a server instead of doing regular http etc?
by liudr
Fri Jul 22, 2016 3:07 pm
Forum: Beginners
Topic: USB Scale reading
Replies: 4
Views: 1507

Re: USB Scale reading

You may be out of luck with the USB scale. The only thing I could find in its manual is that it sends POS style messages. When you plug the scale in your raspberry pi, do "lsusb" and see what shows up. Also do "ls /dev/tty*" to see if it emulates a serial port.
by liudr
Thu Jul 21, 2016 10:49 pm
Forum: Beginners
Topic: HDMI Display Settings - 800x480
Replies: 7
Views: 18985

Re: HDMI Display Settings - 800x480

I am using a custom hdmi mode and it works well.
https://learn.adafruit.com/adafruit-5-8 ... -pi-config
by liudr
Thu Jul 21, 2016 8:49 pm
Forum: Off topic discussion
Topic: ArduCAM with Broadcom BCM2835 SoC
Replies: 40
Views: 7553

Re: ArduCAM with Broadcom BCM2835 SoC

I think that pretty much covers it! (Not sure about the legendary bit though) That was the joke :) The Pi, great piece of hardware though it is, isn't exactly competing for the top position at CPUboss. This board combines all its weak points with none of its advantages. I don't see being low power ...
by liudr
Thu Jul 21, 2016 3:50 am
Forum: General discussion
Topic: How does rpi decide time between ntp and rtc etc?
Replies: 5
Views: 3081

Re: How does rpi decide time between ntp and rtc etc?

GPS or NTP is more accurate than a RTC (GPS driving NTP gives you a stratum 0 time source), so you should frequently use sudo hwclock --systohc to re-sync your RTC. Either I don't have the proper software or my gps is too cheap, I couldn't make my gps an ntp source. I disconnected network and had m...
by liudr
Wed Jul 20, 2016 7:52 pm
Forum: General discussion
Topic: How does rpi decide time between ntp and rtc etc?
Replies: 5
Views: 3081

How does rpi decide time between ntp and rtc etc?

I'm not sure how the system determines time. I followed this tutorial to install a DS3231: http://www.raspberrypi-spy.co.uk/2015/05/adding-a-ds3231-real-time-clock-to-the-raspberry-pi/ It works but it also makes me think about how to make the best use of various time sources, ntp, DS3231, and gps. T...
by liudr
Wed Jul 20, 2016 7:02 pm
Forum: Other projects
Topic: Looking for a small screen
Replies: 3
Views: 1008

Re: Looking for a small screen

Some sparkfun single color ones I wonder if it is what you want:

https://www.sparkfun.com/search/results?term=oled
by liudr
Wed Jul 20, 2016 5:06 pm
Forum: General discussion
Topic: Motion detection activates audio
Replies: 4
Views: 1287

Re: Motion detection activates audio

The sensor set looks good. It will work with the raspberry pi. The kit looks decent too. If you don't have any circuit stuff yourself, it is a good value to you. If you have power supply and a decent sd card, you can just get the picture instead of the kit.
by liudr
Wed Jul 20, 2016 6:08 am
Forum: Off topic discussion
Topic: ArduCAM with Broadcom BCM2835 SoC
Replies: 40
Views: 7553

Re: ArduCAM with Broadcom BCM2835 SoC

I frankly think that linux/computer geeks worldwide made rpi boards success, not the foundation's goal to teach kids programming.
by liudr
Wed Jul 20, 2016 3:19 am
Forum: General discussion
Topic: How do I cut power in the raspberry pi pins?
Replies: 13
Views: 2305

Re: How do I cut power in the raspberry pi pins?

Try an actual screen. That's the only way to tell if your pi has an under-voltage issue already, before you connect the servo. What do you have on its USB ports? A cheap microUSB cable could be the culprit. Your understanding of how power flows into electronics makes no sense. Never connect LEDs dir...
by liudr
Wed Jul 20, 2016 2:55 am
Forum: General discussion
Topic: UART Raspberry Pi 3
Replies: 7
Views: 1909

Re: UART Raspberry Pi 3

I recommend you to get a sparkfun xbee explorer (or a knockoff) and connect it to a USB port on raspi. No serial console issue or baud rate issue (soft serial for 3B) and your project looks neat. Unless C/C++ is a required aspect of your project, use python instead. Your C lacks proper indentation. ...
by liudr
Wed Jul 20, 2016 2:45 am
Forum: General discussion
Topic: How do I cut power in the raspberry pi pins?
Replies: 13
Views: 2305

Re: How do I cut power in the raspberry pi pins?

How are you connecting the servo? It sounds like the servo has drained enough power to reset rpi. When you are NOT connecting the servo, do you see rainbow box on your screen's top right?
by liudr
Wed Jul 20, 2016 2:43 am
Forum: General discussion
Topic: Motion detection activates audio
Replies: 4
Views: 1287

Re: Motion detection activates audio

Sure. You can use a transmissive sensor like a garage door sensor. One emitter on one side and one sensor on the other side. Playing audio is easy. You can use aplay command with the name of the sound file (.wav format).
by liudr
Tue Jul 19, 2016 10:12 pm
Forum: Troubleshooting
Topic: Periodic noise on MCP3008 ADC connected to Pi 3
Replies: 14
Views: 4089

Re: Periodic noise on MCP3008 ADC connected to Pi 3

The 3.3V rail can only supply 50mA. What is the resistance of your ptc? Are you connecting a serial resistor and if yes what value?

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