All Questions

0
votes
1answer
13 views

Can't trigger GPIO control via executable run through php's exec function

/var/www/html/index.php <?php exec("./on"); shell_exec("/var/www/html/on"); on.cpp #include <string> #include <getopt.h> #include <cstdlib> #include <sstream> #include &...
-1
votes
1answer
20 views

GPIO solution to power Pi

Looking for a GPIO solution to power a Pi 3 B+. Basically, trying to bypass the Pi micro USB connector. Also, any suggestions on hardware to build a compact, inverted, USB male right-angle ribbon ...
0
votes
1answer
20 views

Butal error on apt-get

pi@raspberrypi:~ $ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done 0 upgraded, 0 newly installed, 0 to ...
0
votes
0answers
9 views

libnfc emulating tag not working on raspberry pi and pn532 module

I am trying to get nfc (NDEF) tag emulation on pn532 board hooked up to a raspberry pi via i2c. The scanning works perfectly, but when I try to emulate a tag, for example using the libnfc's example ...
0
votes
1answer
21 views

Compatibility With GSM/GPRS A6

I'm working with an A06 V2 connected to a Pi zero. Using AT commands to send SMS functions correctly. I try to send MMS using CMMSXXXX commands There is problem. The first commande must by AT+...
0
votes
1answer
24 views

Can I use the Raspberry Pi as a Soundcard

I have an HifiBerry AMP2, which is a RPi hat that lets the RPi act as an audio amplifier. Now I want to connect my PC (Mac) to the RPi, but it does not have a line- or mic-in. So I am wondering if I ...
2
votes
2answers
17 views

Minimum Pulse Width for asynchronous Interrupt

Does anybody know what is the shortest pulse width that the Raspberry Pi (any model) GPIO interrupt pins can detect? I have a project in mind, but the pulses would be between 5 & 17ns wide.
0
votes
0answers
15 views

What's a decent overclock for RasperryPi 3B+ with added heatsink at these temps?

So I've been bench-marking my 3B+ with sysbench and i've been thinking of adding an overclock, but i don't want to over do it, what is a decent overclock with these temps (47.2'C is average idle temp) ...
0
votes
1answer
30 views

“push” physical button on a remote

I have a remote for my kitchen fan where I can turn on the fan and toggle to light. This remote says on the back to be using 433MHz so I bought a receiver and transmitter for my Raspberry Pi in hopes ...
0
votes
1answer
40 views

WLAN connected but no internet

I already tried dist-update and this post I have a Raspberry Pi 3 B + and my operating system is "Raspbian GNU/Linux 9 (stretch)" I am connected to it using a Lan cable and use ssh or Remmina to ...
0
votes
1answer
22 views

Designing of Auto following cart

what method can i use sense movement of a person to design an auto following cart for supermarkets.? i need to follow a specific person can i use the WiFi or BLUETOOTH signal strength of consumer's ...
0
votes
0answers
14 views

Trouble Connecting Bluetooth Keyboard After updating and upgrading Raspbian

I recently updated and upgraded my raspberry pi 3 b+, and now my Logitech keyboard K480 will not connect. It was working fine until this happened. I'm looking for any tips to see what I'm doing wrong/...
0
votes
0answers
14 views

UV4L - USB Camera: Device not detected

need some help on what I'm doing wrong. Cannot run uv4l --driver uvc --device-id 1415:2000 due to following error messages: <notice> [core] Trying to loading driver 'uvc' from built-in ...
1
vote
3answers
42 views

can't install opencv on my pi

I'm an absolute Raspberry Pi newbie. My intention is to get some camera vision project working for which I need OpenCV3.3's dnn Python module. I've found here a description of how OpenCV can be ...
0
votes
1answer
27 views

How to change keyboard layout on terminal based os?

I cannot type (-) on my raspberry pi with omv os installed. I know I could before
2
votes
0answers
25 views

Programming bluetooth module of RPi 3 B

I'm trying to scan the invironment of the Pi for active bluetooth devices. I'd like to have MACs, names and signal strength. Of course I can run bluetoothctl in the shell and then use scan on command ...
1
vote
0answers
8 views

Live video streaming over bluetooth

I'm currently making a little project, and i need my Raspberry Pi 3b to transmit an USB webcam stream trough Bluetooth to display to an Android smartphone or any other portable device (like another ...
0
votes
0answers
9 views

Record video and audio from framebuffer

I'm trying to record in a video the actual content of the framebuffer along the audio currently outputted (alsa). For the video I'm using the following command: ffmpeg -y -f fbdev -i /dev/fb0 -vsync -...
-2
votes
0answers
38 views

IOT create application package in Visual Studio [on hold]

How to create an application package or exe Windows IOT file?
-1
votes
0answers
13 views

KNACRO 4-Channel DC 5V Relay Module - What is the 'com' that is on the GPIO side?

KNACRO 4-Channel DC 5V Relay Module 30A DC 30V/AC 250V connected to a Raspberry PI 3 B+. 3 channels will work but 1 won't. I'm assuming is a 3.3 vs 5v issue. It doesn't matter which 3 I use they all ...
0
votes
2answers
40 views

Python button script stopped working

I have this script which runs a motor until a button is released. It was working fine up until making some changes to the setup earlier but now the motor doesn't stop when the button is released - ...
0
votes
1answer
34 views

Connect 6 accelerometers to Raspberry Pi

I need to connect 6 LIS3DH Accelerometers to a Raspberry Pi. Is this possible, and how would I do this? Do I need to use I2C or SPI? Or do I need something like an I2C multiplexer? (If another type ...
0
votes
0answers
17 views

What is the maximum usable SPI frequency for Raspberry Pi 3 Compute Module?

I have checked What SPI frequencies does Raspberry Pi support? question, anyway its subject is RPi, not RPi Compute module. Also, I want to check for usable frequency, not theoretical. Limitations ...
1
vote
0answers
46 views

SD Card Copier - Space lost on backup

I'm making backups of my SD card as a preventative measure using the desktop tool "SD Card Copier". Whenever I make a backup using this tool, I end up with 2GB less free space ("Available") reported ...
-1
votes
0answers
17 views

Raspberry Pi + L293D to switch 12V solenoid valves

I am porting an Arduino project to Raspberry Pi. On the Arduino I switched two 12V solenoid Valves with the help of a L293D IC. It worked perfectly. Now I am porting this system to a Raspberry Pi. ...
1
vote
1answer
24 views

Rpi not Accepting default password when connected via ssh

I was trying to setup a ssh connection to my pi 2 (model B, i.e., no inbuilt wifi) in headless mode from my ubuntu machine. I do not have a router. After multiple attempts of flashing and tweaking, ...
0
votes
0answers
18 views

Problem with interfacing ds18b20 and mcp3208 simultaneously

In my project i am trying to interface both DS18b20 and MCP3208. When i interface both any one interface only working but not both(spi and 1-wire) not working simultaneously. For ds18b20 i am using ...
1
vote
2answers
28 views

software solution for non-blocking UART communications

For UART communication on Raspberry Pi one can write a program in Python with the pyserial package or a program in C. Pyserial requires Threading for non-blocking UART, while C libraries allow to use ...
0
votes
2answers
20 views

Set for Graphical WLAN and static (bridged) br0 and eth0

I'm using the latest (Stretch) version of Raspbian (2018-11) on both Raspberry PI 2B and 3B hardware, one with working WLAN dongle and the other with internal WLAN. For the last three weeks or so I'...
0
votes
1answer
16 views

Synergy closing immediately

So I'm running raspbian stretch on a raspberry pi 3 and just installed synergy to run as the client. (installed via terminal "sudo apt-get install synergy") It was working yesterday, but now, when I ...
0
votes
2answers
38 views

Uploading a file via SFTP from a raspberry pi to a remote server. From the command line

I need to upload files from a headless raspberry pi to a remote server. A simpfied example: The file to transfer /tmp/test.html Remote location: something.com Port 22 Username: user1 Password: ...
1
vote
0answers
15 views

Raspberry Pi Audio Bridge

I would like to connect audio from a TV to be received into a Raspberry PI and then be transmitted via Bluetooth to a wireless Bluetooth speaker, is that possible? If so, how? Audio card?
1
vote
1answer
34 views

Raspberry PI not accessible without HDMI plugged in

I have a Raspberry Pi 3. For whatever reason, it doesn't seem to boot up if the HDMI cable is not plugged in. I am running the latest "stretch" desktop version. Steps taken: 1) Plug in AC adapter. ...
1
vote
2answers
41 views

Raspbian passive data consumption

I'm using raspberry Pis with raspbian lite for a project that requires them to be out in the streets with a 4G dongle to get internet access. As you can imagine, I want to keep the device's data ...
0
votes
1answer
31 views

Cluster as individual Pi's

I have built a Pi cluster (4 boards) rather than using them as a "super computer" can I use the cluster as four individual boards? e.g. one as an Internet Dropout, one as a mail server, etc? Thanks ...
0
votes
0answers
18 views

My rotary encoder is missing pulses - what are some potential solutions?

I have a rotary encoder with a very high resolution (5000 pulses per rotation). I've used several different python scripts to count and display the pulse count as I turn the encoder. The faster I turn ...
1
vote
0answers
19 views

How to login compute module via serial port?

I tried to login to compute module 3 io board from a USB serial port in my PC, but PUTTY just hangs there. Following procedures have been made: raspi-config -> interface options -> serial port -> ...
0
votes
0answers
19 views

How to auto power on SIM900A module with raspberry pi? [closed]

I have a SIM900A module .It is having a powerkey this needs to be pressed for 1 second to turn on i need to automate this process but I am not been able to find the power key pin in my evaluation ...
4
votes
1answer
836 views

Is it advisable to use an SD from Pi Zero in a Pi Zero W?

I have an SD card which was painstakingly set up with various functionality (e.g. necessary packages, settings, etc...) on a Raspberry Pi Zero. Now I want to replace the Zero with the Zero W (so I ...
0
votes
0answers
12 views

extra i2c bus and circuitpython lib(Raspberry Pi)

I'm a newbie to Ras Pi and I am having trouble with i2c sensors. I bought SHT31d from Adafruit Industries to measure Temp and Humidity in several spots in my house. I used to use DHT22 before, but ...
0
votes
2answers
72 views

Will adding RTC to a Pi make it more stable? [on hold]

I use my Pi 3 as a desktop machine and it generally does pretty good. Occasionally I run into the issue that if I use an application, mainly Firefox and sometimes Chromium, the application will either ...
0
votes
0answers
25 views

Trying to use Ethernet over Bluetooth between Pi boards

I'm trying to use SSH over Bluetooth via Ethernet over Blutooth. I've based my effort thus far on: Bluetooth PAN Network Setup with BlueZ 5.X I believe I have faithfully followed the instructions. ...
2
votes
1answer
31 views

tmux question - why can user “pi” attach to a tmux session, but not the other user?

My second user "robert" cannot attach to a tmux session, even when I used sudo. I type: sudo tmux attach -t ruby and I get the output of no current session. If I type tmux ls, I get no server running ...
0
votes
0answers
25 views

MQTT connection to broker

Hello I would like to configure paho mqtt but I am having trouble to get it to work properly. I am trying to connect my raspberry to external server where broker is up and running. Port and IP are ...
0
votes
2answers
48 views

Autostart a program comprising GPIO-commands

I am used to autostart with rc.local, after making my program called "test3.py" executable (sudo chmod a+x test3.py). I failed to get it autostarted, means as the first program which the Raspi-stretch ...
0
votes
3answers
43 views

How do I set up a OpenVPN tunnel for Raspberry Pi on LAN without internet connectivity?

My setup is described in the image above. I have a raspberry pi connected to a router via Wi-Fi and the router is connected to a host via a Ethernet cable. The router doesn't have a internet ...
0
votes
1answer
17 views

Raspbian and Netgear 779s LTE modem

I've been having trouble the last two days figuring out why my NetGear 779s modem isn't working fine with Raspbian. I installed NetworManager, and did sudo systemctl disable dhcpcd and sudo systemctl ...
1
vote
0answers
15 views

SPI access via C# .NET Core console app

I do not have much experience with C# or Linux/Raspbian so would like some advice/guidance please. Basically I need to write a C# .NET Core console app which will run on a Raspberry Pi Compute 3 ...
0
votes
0answers
20 views

Bluetooth Audio does not seem to work on Raspbian Strech

After installing Raspbian Strech from NOOBS_v3_0_0 on my Raspberry 3B I have observed that setting up Bluetooth is not a completely easy matter. Most helpful was the installation of the BT manager as ...
1
vote
3answers
64 views

How to choose a suitable display for pi 3 B+?

I'm currently looking for a display 5 inches or less for my PI, but there are a lot of information and since I'm quite new to the world of raspberry I'm looking for some help and guidance on where ...

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