New answers tagged pi-3
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Question
Rpi3B+ Stretch9 WiFi Station + AP IOT Hotspot Docker Setting Up Problem
Short Answer
1. WiFi Station + AP IOT Hotspot Based Config API Setup Notes V1.0
Now I am doing the first step of setting up - Installing the docker.
This setup step is summarized in Appendix H below.
Update 2019jun25hkt2104
Docker Hello World running OK, though I ...
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You could use PINN, which allows independent installation of multiple OS, and enables switching between them.
The latest version has options to clone an OS (although I have never tried this).
Another alternative is to have 2 root partitions. It is possible to switch between the 2 OS by a simple edit on cmdline.txt. This does require the OS to share a boot ...
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I hosted my personal blog in a Raspberry Pi. you can see the stats of this litte computer in this page
https://www.flopy.es/monitor/status.html
In the same raspberry I have my blog, my webpage (more serious), a mail server and a personal cloud made with Nextcloud.
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I was able to fix the problem by bumping up the GPU memory from 64 mb to 128.
https://www.raspberrypi.org/forums/viewtopic.php?t=236393
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Let's take a peek at the Pi 3B schematic. I'll assume you'll use the micro USB input.
Maximum reverse input voltage: 5V
Anything past -5V would probably result in catastrophic failure of the BCM857BS (V_EB absolute maximum rating violation on pins 2 and 1, but then, there are resistors.)
Absolute maximum input voltage without peripherals: 6V (but I wouldn'...
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Based on the answer by Ingo, I went and made a script to do this job.
https://github.com/Autodrop3d/raspiApWlanScripts
The gist is that there's one script to run that'll setup the Pi for reboot-less AP/STA switching and then there are helper scripts that'll actually do the switching for you.
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As many have already mentioned, do NOT use higher voltage. It'll fry your device. Rather try a charger/power supply that can power up to 3amps of current at 5V. You may have a hard time finding those, and even if you find, you'd see that most Chinese adapters are wrongly advertised, hence will not actually provide 3 amps. So unless you have a fast charger (...
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If you want an actual button pusher for educational/entertainment needs, then you can ignore this answer.
Given your description, I would assume that this physical button is a normally open push button (NOPB) with two wires going to it. In this case, I would think you could come up with a simpler solution that involves tapping one or both of those wires. ...
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The problem of building a proper power supply for the Raspberry has been discussed at lots of places, and the canonical answer is to buy the official Raspberry power adapter.
I just bought one myself, price was not too high, something like 14 euro, and this includes a contribution to some charitable projects. It is rated 5.1 V and 2 A, and has pretty thick ...
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The Raspbian project does not build nonfree packages. Some nonfree packages are available, but they're just the cross-platform ones imported from upstream Debian.
If you need to install it you'll have to build it from source.
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While the other Anwsers are correct as in 'you should not provide any higher voltage then 5.25V', the solution to your initial problem (yellow thunderbolt sign) is to use a power supply which provides a higher current. the official raspberry pi power supply is labeled at 2.5A
And in my experience (running a >100 RasPi research network) a 2A power supply is ...
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I will be customizing another power supply manually using voltage dividers
You can't do that. And this suggests that you're a novice with electronics.
Voltage dividers are fine for signal conditioning or creating a relative reference point for something, e.g. an A/D converter. They are not a way of regulating a power supply.
Any modern computer varies its ...
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No, you should not increase the voltage any further... and at least this answer linked in the question does not suggest to do that.
From Raspberry Pi Power Limitations:
Power sources SHOULD provide 5±0.25V ...
and:
The newer Pi(3/2/B+) have a voltage monitor chip (APX803) which triggers at 4.63±0.07V. The Pi3B+ uses a MxL7704 chip to manage power, ...
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The MAXIMUM is 5.25V, although this should NOT be the target. You should not apply more than 5.1V
That is not to say the Pi will be damaged by the higher voltage, because nothing uses 5V - the on-board regulator supplies the voltages used by the Pi. There is a point when the transient protection diode will trigger - causing the poly fuse to blow.
No one ...
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Nobody can answer that question as it will be down to the peculiarities of the components in each Pi.
As you know 5V +/- 5% (4.75 to 5.25 V) is the USB spec.
In your case I suspect your power supply claims more than it delivers. Try a better cable or known truthful supply.
That said I have powered higher at 5.8V without causing any known damage. However ...
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Problems are often occuring when using both bluetooth and wifi at the same time with both rpi 3 and zero.
In order to solve problem concerning the bluetooth (used for me to share audio content), I've found two solutions :
disabling wifi when bluetooth is used (which can disconnect you from the pi if you use ssh)
using a specific bluetooth adapter instead ...
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I also faced the same problem.
What I found is the data send by Arduino has difference in trigger clock when it reaches raspberry Pi. As a result we get garbage values.
To overcome this problem we can use an Arduino connected to the Pi through a USB cable and an nrf24l01 connected to the Arduino. Then use the master-slave procedure to get the receiver ...
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You need to pull the GPIO to either 3V3 or ground in each switch position.
If you connect one end of the switch to ground it would be normal to connect the other end of the switch to a GPIO with a pull-up to 3V3.
If you connect one end of the switch to 3V3 it would be normal to connect the other end of the switch to a GPIO with a pull-down to ground.
You ...
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Please look at the very last question: are you root?. That is what you get by prefixing your commands with sudo. So try your command with:
rpi ~$ sudo apt-get -f install
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It sounds like you have destroyed the Pi and will need to buy a new one.
The most likely explanation is you connected 5V to the Pi's 3V3 pin through the NRF24L01.
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You analysis shows that the PI is fast enough to transmit and receive the data.
The only conclusion left is that whatever you do in MATLAB is too slow. While the PI is not bad, it is no match for a somewhat recent PC.
So you may want to write the control program in a more efficient language, like C, or you can try to identify the parts that need the most ...
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What great timing! We are excited to announced our ALPR SDK on Raspberry Pi. Depending on the size of your project, you may be able to get away with our Free Trial. You can read more about our ALPR SDK for the Raspberry Pi) in our blog: https://platerecognizer.com/blog/alpr-on-raspberry-pi/. And from there, you can get the Free Trial to start your ...
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There is an option that the AEC you are trying to use is not capable of handling the echo tail in your system. I suggest to start by measuring the echo tail in your system. The following post will guide you how to measure the echo tail.
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I can confirm, after having used the Bela shield on top of a Beaglebone Black, that its latency is extremely low (<1ms) and quite capable of doing calculations on audio.
The normal shield has 2 jack microphone inputs and 1 jack stereo output.
Strictly speaking, you have to buy the version that comes with jack adapters, though.
I do believe more inputs/...
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After much strife, my issue was solved by installing blueman and using its wizard to pair the remote.
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Raspberry Pi 3B+ running Ubuntu 18.04.2
Hope this helps someone - I kept getting that long list of errors noted on this thread, I added this line to /boot/firmware/config:
dtparam=audio=on
rebooted and I can now generate a sound with
play -n synth 0.2 sin 440
I installed sox and alsa-utils and did this:
sudo modprobe snd_bcm2835
No idea what that ...
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arp -a prints a cached list of hosts/devices that have been talking to this host. Therefore if you see your smart plug and other devices appearing in the output, it's proof they were talking to this host since the last reboot of the Pi or restart of its' networking.
In a nutshell:
Your nmap is doing OUTWARD scanning of the specified subnet from the Pi ...
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Default config for a Pi is DHCP addressing. The router (or switch) assigning the IP to your Pi will assign one from a pool of addresses with an express lease time set for the IP address it assigned (mapped) to the mac address of your WLAN0 interface.
Think of this IP as "loaned" to you: it's not yours in perpetuity and the address can be chucked back into ...
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After using Ctrl+Alt+F1, try using Ctrl+Alt+F7. this should return you back to your normal screen.
If that doesn't work, return to first screen using Ctrl+Alt+F1, then type startx. Enter that and it should reboot normally
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That's exactly what interrupts do. In python there is a function RPi.GPIO.add_event_detect( GPIO_NUMBER, GPIO.RISING, callback=yourCallback). You then need to define a function yourCallback() where you manage whatever has to happen when the respective gpio senses a RISING edge. A websearch for "raspberry pi gpio interrupt" will reveal several detailed ...
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The 2.1A one will be the best. But it may not work and so you should test.
Many power banks and powered hubs are "too smart" (that is, spec compliant, which is good) and will not provide the extended current , above 500mA, without the proper USB PD requirements being satisfied.
In the vanilla case, pre usb pd this was an adhoc "standard" of a resistor ...
3
chrome is designed for ×86 processors only
the RPi is an ARM processor
but you can give chromium a shot.
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You can use lirc to achieve what you want. When you have installed it you can use its diagnose tool mode2 to get low level information about the signals that are received from the remote control.
Then you need a configuration file that maps the lirc pulses to the buttons of your remote control. On the internet there is a database with many config files for ...
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While answers which are mostly links are discouraged, IR is NOT simple enough to explain in a few paragraphs.
You seem well informed already acknowledging that each button has its own code. That is a little bit over simplified (depending on the "codes" being used), but you at least have a good grasp of it and what you want to do.
The Pi has a great IR ...
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Question
However, within the application launch bar editor, every time I try to
add an app, the editor crashes, and my toolbar disappears (making me
have to reboot).
Answer
Perhaps you forgot to tick the task bar in the panel apps menu before
closing. (See the highlighted option in the picture below)
I did find the menu design a bit confusing. ...
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Ah, you forgot to include the "cont_ad.h" file in your "sphinxbase" directory, therefore you compiler is not able to do its job. Perhaps you can give us the weblink to the installation guide you are following.
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Finally I was able to find a solution. I used the example 2 from this post posted in Arduino forum https://forum.arduino.cc/index.php?topic=396450.0. I have edited python code also.
Arduino code
// Example 2 - Receive with an end-marker
const byte numChars = 32;
char receivedChars[numChars]; // an array to store the received data
boolean newData = ...
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Copper heatsink if they are of similar dimensions. Generally, aluminium is about 60% of copper in terms of thermal conductivity, specific types vary but not much.
https://en.wikipedia.org/wiki/Copper
https://en.wikipedia.org/wiki/Aluminium
The fan will be the most important factor - speed, flow rate, pressure. And if using a case would be ventilation.
...
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I have been facing this issue for a while and finally I figured out. Here I just want to post my approach even if the question is old.
Let's clean some temporary files:
sudo apt-get clean
sudo rm /var/lib/apt/lists/partial/*
Then, we can uncomment some a line from:
sudo nano /etc/apt/sources.list
In my case, the file was like this:
deb http://raspbian....
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What do you mean by image is corrupted ?
If it's an installation issue with WIn32DiskImager, here's my experience:
I just installed Raspbian on an SD Card this morning and I got an error too but went to Raspbian official doc and found Etcher which work really well and even have a portable version !
Here's the release page of their Github, you'll find what ...
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It seems like Plex was doing something in the background and used way too much memory. I have reviewed every setting, removed automated preview/cover generation and automated library scanning. Since then I did not experience freezes like this.
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I am still using raspbian wheezy on one of my soho-servers because I don't want to go through all the tweaking and reconfigure tasks, because it took many months to fine tune it for my needs.
As you already know wheezy is outdated so I can't update/upgrade it, for now, and to avoid errors when trying to install packages, I needed to fix the source list to ...
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