Dec 3, 2018 - MiniNodes says it will use the carrier board to engineer a five-node. The cluster board supplies power and connectivity to five Raspberry Pi 3.
Today’s post is about my successfully interfacing a UV5R Baofeng with a Raspberry PI 3 running Svxlink. Primary use is for an Echolink node connecting to a local repeater.( Updated Jan3, 2018 – Some reports that not all variants of the UV5R work as described below. I have used the UV5R+ and UV5RV2+ successfully. )My primary goal was to NOT use VOX to trigger the push to talk but to use a COS or Carrier Operated Switch.is a powerful software program that can be used as a repeater controller, a simplex link. Supports networked multiple receivers and transmitters. It also has an Echolink module.is a popular system that allows two or more nodes to connect over the internet.I wont discuss the installation or setup of Svxlink as that is covered many times. Svxlink has built in support of the GPIO (General Purpose Input Output) pins on a Raspberry PI.During my research time and time again I found reference to a hardware modification for the UV5R where you solder a wire to pin 2 of the audio amplifier in the UV5R.The final audio amplifier’s supply voltage is removed when no signal is present and supplied when signals are received.
This mod which connects to that supply Vcc was fairly easy and can be found.However I noticed on the schematic of the UV5R that there is no dc blocking capacitor on output to the speaker and external speaker jack. The output goes to about 3 volts when the amplifier is enabled.
To zero when no signal is received. Why then do I need to open the case? UV5R audio output sectionIt is not necessary. Note the connection from pin 1 to the external speaker jack.
Seems like a poor design to me to keep the internal speaker inline? (I wont go into the point of C158 and R192 in series with ground connect at each end? The schematic.must. be wrong. At least their is 3 volts on the external speaker output when a signal is presentI can work with that!!Here is the interface I built which works fine.
It expects the PTT control signal from the GPIO pin to go high (3v) to trigger the ptt output which grounds the PTT line from the UV5R. And the COS signal to go hi (3v) from the RX when a signal is received.
The output will also go hi when is connected to one of the GPIO pins on the Raspberry PI.I decided to use 2 1:1 isolation transformers for the audio to minimize hum. I also am using two pc817 opto isolators instead of relays for outputs for the COS signal and PTT.There are three adjustments. RX audio level, TX audio level and the COS/COR threshold. I made that variable so it can be used on other systems if desired. Completed interface board.The main take-away here is NO NEED to MODIFY the UV5R.This circuit can also be used to interface with a PC serial port.however. you might want to add a diode on the PTT input to prevent rs-232 negative voltages. And you don’t have to use 3.3v unless you are interfacing with logic that requires 3.3v.I hope this helps some struggling Amateur.
Feel free to use/modify etc to suit your purposes.All parts were ordered on Amazon and the total cost is about $10. Hard to tell as I purchased the parts in lots of 10 or more.73 WB5HUP. Your audio circuits have blocking capacitors on both sides of the transformers; is that not redundant? I was thinking that any DC bias is removed on the input side, and only audio AC is presented on the output of the transformer. Therefore, no DC block should be necessary on the output side of the transformers. If the caps are more for filtering, I would think that this would provide the same frequency range on either side of a 1:1 winding, so still one is redundant.Am I missing something?.Joe onJanuary 2nd, 2019 12:18 pm.
This is a great post, I will bookmark this one as I’m also running a UV-5R using CM108 on rpi svxlink so far it’s working really great no complain at all. But, for now, I don’t use the COS of the radio, I just set the configuration settings of svxlink.conf to detect rx using VOX method. I want to utilize the radio COS because I have read that’s more precise control of incoming signal than vox from svxlink itself.I found out that on my UV-5R pin 2 of the TDA chip, when it receives a signal it goes from 0 to 8.2v.
This is same voltage VCC of the radio. I wonder why you have said, that on your radio – The output goes to about 3 volts when the amplifier is enabled.onFebruary 25th, 2019 12:41 pm.
Get started with and Get started with Raspberry Pi 3 and Node.js IntroductionIn this guide we will build a simple Node.js web server project on a Raspberry Pi 3. At its most basic, the process for deploying code to a Raspberry Pi 3 consists of two major steps:. Setting up your Raspberry Pi 3 with balenaOS, the host OS that manages communication with balena and runs the core device operations. Pushing your Node.js project to the balena image builder, which pulls in all necessary dependencies and creates the container image for your application.Once these steps are finished, your Raspberry Pi 3 will download the container image, kick off your application, and begin sending logs to your balena dashboard! What you will need. A. See our for other boards.
A 4GB or larger microSD card. The of the card also matters - class 10 card or above is the way to go. A micro USB cable.
Optional An ethernet cable. Optional A. A.Need help?If you find yourself stuck or confused, help is just a click away:. The section of the forums is where our engineers address any issues you may be having with balena. You can read more about our approach to support.Account setupIf you don't already have a balena account, make sure to. Adding an SSH KeyBalena uses git to push code from your computer to a dedicated repository. As part of the account creation process, you will be asked to add a public SSH key.
![5 Node Raspberry Pi 3 Com Carrier Board 5 Node Raspberry Pi 3 Com Carrier Board](/uploads/1/2/4/1/124152566/110765364.jpg)
The SSH key secures your connection to our server, letting us know you have the authority to make changes to the repository.Note: You can click Skip to move past this step for now, but you will not be able to push code to your Raspberry Pi 3 until you have added a public key to your account. This can be done at any time from the page on the dashboard.If you have a public SSH key, simply paste it into the box provided and click Save Key:You can also import your key from GitHub. If you choose this option, you will be asked to enter your GitHub username: Don't have an SSH key?If you are unfamiliar with SSH keys, we recommend you take a look at GitHub's. This will walk you through everything you need to create a key pair. Window's user? Be sure to check out.
Create an applicationAn application is a group of devices that share the same architecture and run the same code. When you provision a device, it is added to a specific application, but can be migrated to another application at any time.To create an application, select the Raspberry Pi 3 device type, select an, enter a name, and click Create new application:Note: To create an application with multiple containers, you'll want to use the starter or microservices application type. The starter applications are full-featured and free for all users, with a limit of up to ten total devices across all starter applications.This will take you to the dashboard for your newly created application, where you can manage your whole fleet of Raspberry Pi 3s. Add your first deviceTo connect with balena, your Raspberry Pi 3 will need a balenaOS image that is configured for your device type, application, and network. Start by clicking Add device in your application dashboard:For most applications, you will have the option to select a device type. By default, the device type you chose when you first created the application will be selected.
Applications can, however, support any devices that share the same architecture, so you can choose another device type if needed.After selecting a device type, you will see a list of available balenaOS versions. In general, the most recent version is recommended. You can also select whether you would prefer a Development or Production edition with the respective toggle:Note: When you're first getting started, a Development image will be most useful, as it permits a number of testing and troubleshooting features. For production use, be sure to switch to a Production image. More details on the differences between Development and Production images can be found.A toggle is also used to select whether your network connection will be through Ethernet Only or with the option for WiFi + Ethernet.
Selecting Wifi + Ethernet allows you to enter a WiFi SSID and WiFi Passphrase:Clicking Advanced presents the option to select the rate at which your device checks for updates and the option to download just a configuration file ( config.json) rather than an entire image:Once you have finished your image configuration, click the Download balenaOS button. When the download completes, you should have a zipped image file with a name like balena-FirstApp-2.3.0+rev1-dev-v6.1.3.img.zip, where FirstApp is the name you gave your application on the dashboard.The next step is to flash the downloaded image onto your SD card using, a simple, cross platform SD card writer and validator. Once you have Etcher installed, start it up. To give Etcher access to your SD card, your system may prompt you to grant administrative privileges.To create a bootable balenaOS SD card follow these steps:. Click Select image and find your application's balenaOS image file. If you haven't already done so, insert your SD card into your computer.
Etcher will automatically detect it. If you have more than one SD card inserted, you will need to select the appropriate one. Click the Flash! Button.Etcher will now prepare a bootable SD card and validate that it was flashed correctly. This can take roughly 3 or more minutes depending on the quality of your SD card. You'll get a little ping when it's done, and Etcher will safely eject the SD card for you.Note: You can burn several SD cards with the same image file and all the devices will boot and provision into your application's fleet.
You can also disable the auto-ejecting or validation steps from the Etcher settings panel. Provision your deviceInsert the SD card into your Raspberry Pi 3 and connect the ethernet cable if necessary.
Now power up the Raspberry Pi 3 by inserting the micro USB cable.It will take a minute or two for the Raspberry Pi 3 to appear on your balena. While you wait, the balenaOS is expanding the partitions on your SD card to use all available space, installing a custom Linux environment, and establishing a secure connection with the balena servers.You should now be ready to deploy some code!Note: Class 4 SD cards can take up to 3 times longer so it's well worth investing in the fastest card you can find. My device won't show up.If your device still hasn't shown up on your dashboard after a few minutes, something is definitely wrong. First check that you entered the WiFi credentials correctly and ensure that your network meets these.
It may also be worth checking theIf you still can't get your device online, come on over and talk to us on our.Note: If you have an HDMI screen attached, you should see 'Booted - Check your balena dashboard.' On the screen when the device boots. If instead you see rainbow colours or a black screen with 4 raspberries on it, it could mean that the SD card was not burned correctly or is corrupted. Deploy codeNow that we have a device or two connected to a balena application, let's deploy some code and actually start building something.A nice first project to get your feet wet is a simple web server which will serve a static page on port:80. All the project source code can be found.To clone the project, run the following command in a terminal or your preferred git client: $ git clone This project runs an application in a single container.