Have a Raspberry Pi 4 with 4GB or 8GB of RAM and want to run the popular noSQL database, MongoDB? Read on for installing and running the latest 64-bit versions of MongoDB and Ubuntu 20.04.(more…)
Category: Raspberry Pi
View your Raspberry Pi (Zero, 2, 3, 4) display on-the-go without VNC or prior configuration. Great inexpensive device for your toolbox! Laptop required 🙂
I have a bunch of R-Pis of various flavors. I also use R-Pi cameras (regular, IR and HQ) on a regular basis. I don’t always know the WiFi or network config for where I’m going. Sure, you can change files on your SD Card to configure things for WiFi or connect to a laptop via VNC (if you know about access point configs or know the network ahead of time). A GREAT tool I’ve added to my toolbox is an inexpensive video encoder – also known as an HDMI Video Capture USB Device. I picked up 2, at different times, off eBay for about $15/each. They are very small and light – about 2″ x 1″.
I was prompted to write this as I saw an Adafruit Tweet that mentioned their (new) product, “USB 2.0 to HDMI Video Capture Adapter.” A good deal at $20 with HDMI cable. All you do is plug your video-out from an R-Pi into the HDMI input and plug-in the adapter to a USB port. It then acts like a webcam in that you can use apps to view the R-Pi display on Mac, PC or Linux laptop (or desktop). This is an awesome, easy way to view video to focus a camera or preview an image or video stream – without stutter or dropped frames – that you get using VNC.
This is yet another take on how-to create a time-lapse video. In my case, a website updates a photo of the sky on a regular basis. I wanted to turn that into a time-lapse video and deploy to another, or possibly the same, website. I decided to use a Raspberry Pi 4 that was “sitting around.”
My project evolved as I tried different techniques and apps. I ended up creating a couple of bash scripts to do the job. I used the “ffmpeg” audio/video framework as it was bash command line friendly. I have tested my scripts on my Raspberry Pi 4 with Raspbian OS as well as on different Linux boxes running Ubuntu and Debian.
For how-to scripts with instructions, click on “more“(more…)
CouchDB also has Fauxton, a native web-based interface built into CouchDB. It provides an interface to the majority of the CouchDB functionality, including the ability to create, update, delete and view documents and configuration parameters.
I’ve already written a blog post for installing CouchDB 2.0 under Rasbian Jessie for Raspberry Pi. I’m updating my instructions for CouchDB
2.1 2.3 and Raspbian Buster (in addition to Stretch and Jessie). I’m presenting this “how-to” in cookbook form — i.e. just type in the commands as presented and you should end up with a functional CouchDB install. For more background and info, check out my previous blog post.
[Updated 10 July, 2019] Continue for detailed instructions
[UPDATED 05 Jan 2020] There is now an official Ubuntu 18.04 LTS image for Raspberry Pi 3. Install the arm64 image following instructions on the Ubuntu Wiki. You can then install MongoDB 4.2.x per this blog entry. NOTE that I still recommend adding swap space – as mentioned below.
[UPDATED 03 Nov 2019] Looking to run MongoDB 4.2.x on a Raspberry Pi 4? Check out this post. It is also possible to run Ubuntu 18.04.2 (ARM 64-bit) directly on the Raspberry Pi 3. You can read more about this and get SD Card images from the Ubuntu wiki. I am using the server version of “Ubuntu Classic” as opposed to the new “Snappy Ubuntu Core.” MongoDB has an official release of MongoDB
4.0.6 4.0.11 for “Ubuntu 16.04 Linux 64-bit ARM 64.” I will show how to install this version of MongoDB under Ubuntu 18.04 on the Raspberry Pi 3B+. These instructions should work for any version of R-Pi 3 but I have only tested on my Raspberry Pi 3B+.
[Updated: 28 Feb 2019] Time to lose this post! The MongoDB 3.4 binaries have vanished from the Debian buster ARM repository BUT I now have MongoDB 4.0.6 running under Ubuntu 18.04 on a Raspberry Pi 3B+ Check out this new post!
I’ve been asked multiple times if MongoDB 3.2 (or greater) can run on a Raspberry Pi. The answer has always been “no” — as you need a 64-bit OS to run versions >= 3.2. Some 64-bit Linux OS’s are starting to become available for R-Pi that, in theory, could run 64-bit MongoDB. I finally found a configuration that was easy to install and use. I now have MongoDB 3.4.18 running under Debian buster on a Raspberry Pi 3 — with a few caveats 😉
The Debian buster release for Raspberry Pi 3 is NOT yet an official image. The hardware still needs the non-free R-Pi firmware to boot. NOTE: the latest image WILL work for the new R-Pi 3B+. There are a growing number of apps that run under buster 🙂 My install is strictly terminal based — or headless (via ssh). The MongoDB utilities are also (now) ported. You can run “mongod,” “mongos,” the “mongo” shell and utilities such as “mongoimport,” “mongodump,” and “mongorestore” from the local command line or via ssh.
Here is the how-to:
- get and install the Debian buster image on a microSD Card
- boot the R-Pi 3 under Debian buster
- update the OS via “update” and “upgrade”
- install MongoDB via “apt-get install”
- configure memory and swap
- test out your configuration
- put data into MongoDB database(s)
I had the need to embed a webcam image in a webpage. I did not want to stream video and did not want to view images directly on my Raspberry Pi. I wanted to take a picture every so often and upload the image onto a website. I also wanted the webpage to update with the latest image. One other requirement was for the webcam to (try to) survive power outages without file system corruption and with auto-start at boot/reboot. Yet another Raspberry Pi Zero project was born!
I will assume that you have setup a Raspberry Pi Zero W with an official camera module though other Raspberry Pi versions will certainly work. I am using the official Zero case with camera lid as it makes a nice small package and protects the camera. I recommend using the Raspbian Stretch Lite Operating System. Ensure that you configure WiFi and have internet connectivity where you plan to position the Pi/Camera. You will need terminal or ssh access to the Pi during the setup described here.
- Test camera and software configuration & prepare image for uploading
- Setup SSH keys for easy, hands-off image file upload
- Write shell script to take & upload image
- Create a start-up service to launch the script & recover from errors
- Create an environment where only RAM & not the SD Card is used
- Prepare the target server & webpage to receive & update image
Our garage has a ladder sticking out near where we park our car. We want to park close to the ladder leaving enough room to walk in front of the car and also allow room behind the car for the garage door to close. A typical solution to this need, and one we’ve used in the past, is to have a tennis ball on a string positioned such that the car window nudges the ball and shakes the string — so you know when to stop. A great analog solution! I, however, desired a digital solution that incorporates a Raspberry Pi.
OK, a digital solution should either have a sensor that is tripped by the car or, even better, something that could dynamically measure and show the distance from the car to the ladder. This would require some way to provide feedback to the driver. Hmmmm, feedback could be visual or maybe via sound. Yes, that’s it! I could have an R-Pi measure the distance and “talk” to the car driver. Another project is born 😎
The main operating system for Raspberry Pi, Raspbian, continues to evolve. The latest version as of August 2017 is “Raspbian Stretch” — based upon the current stable version of Debian 9. The previous version was known as “Raspbian Jessie”. One difference between versions is OpenSSL libraries. OpenSSL is a general purpose cryptography library that provides an open source implementation of the Secure Sockets Layer (SSL). My previous builds of MongoDB relied on the older library. As a result, my previous binaries for 3.0.14 and 3.0.9 do not run under Raspbian Stretch. Given this change as well as other changes to MongoDB source and newer compilers, I could no longer compile MongoDB 3.0.14 with SSL.
After a few source tweaks and use of various compiler flags, I have manged to compile MongoDB core apps and tools. These binaries do NOT support SSL and only run under Raspian Stretch on a Raspberry Pi 3. [UPDATE — 2018 Mar 22] I have confirmed that these binaries work on the latest Raspberry Pi 3 Model B+ with the March 2018 version of Raspbian.
The Apache Software Foundation has released CouchDB version 2.0. CouchDB 2.0, is a “distributed” version of CouchDB, a mature NoSQL, document-oriented data-store that is accessable via a RESTful JSON API. Developers can take advantage of CouchDB’s offline capability and reliable data sync for web, mobile and IoT apps at (any) scale.
[NOTE: September 2017 — CouchDB 2.1 and Raspbian Stretch have been released. Check out updated instructions in this blog post]
Current Raspbian (November 2016) can “apt-get install” version 1.4 and I have previously written about getting CouchDB 1.6 running on the R-Pi. I have now installed version 2.0.0 on an R-Pi 3 and am sharing the process. It is pretty straightforward to get CouchDB 2.0 running on the R-Pi. It takes a combination of the R-Pi specific 1.6 install and the “generic linux” 2.0 install to get things running.