First-time configuration of the monitors is accomplished through the Yo-Yo WiFi Manager library. It’s a captive portal system, not unlike the popular WiFiManager library, but in this case it has the ability to push the network configuration out to multiple devices at once. This MIT-licensed library, which [David] has been developing with [Mike Vanis] and [Andy Sheen], should be very helpful for anyone looking to bring multiple sensors online quickly.
We’re also very interested in what [David] calls the Approximate library. This allows an ESP8266 or ESP32 to use WiFi signal strength to determine when its been brought in close proximity to particular device, and from there, determine its IP and MAC address. In this project, it’s used to pair the “Device Wheel” monitor with its intended target.
Once locked on, the monitor’s black and white wheel will spin when it detects traffic from the paired device. We think this library could have some very interesting applications in the home automation space. For example, it would allow a handheld remote to control whatever device the user happens to be closest to at the time.
Whether you follow along with the instructions and duplicate the meters as-is, or simply use the open source libraries that power them in your own project, we think [David] has provided the community with quite a gift in these unique gadgets.
[Zak] wanted to keep tabs on his network connection without needing to log into his router. Since his router was a PC running Debian Linux, he rigged up a Bluetooth Network Monitor to display the information.
The monitor is based on a ATMega328P that reads data from a Bluetooth serial connection and displays it on the TFT screen. It uses a low cost Bluetooth module to receive data from a router. A shell script fetches the data and formats it into a string that can be sent over the Bluetooth link.
A USB connection with a desktop computer is used to power the device, but [Zak] also added USB support using V-USB. He plans to use it to get data from the desktop. For example, he could display CPU load and temperature data.
Overall, this is a nice project for fetching data wirelessly and displaying it on your desk. [Zak] has provided the code and Eagle files with his write up for anyone interested in building their own.
One of the benefits of working in IT is that there is typically a healthy supply of miscellaneous, half-functioning equipment to mess around with. [Vittore] had an old laptop with a busted LCD sitting around (Google Translation), so he figured he might as well get it to do something useful. With a spare desktop LCD panel and some software tweaking, he built himself a slick network monitoring panel that hangs in his office.
He stripped the laptop down to the bare essentials, and mounted it along with an LCD screen in a plexiglass enclosure. He has Nagios running a server in his office, and with the help of a few plugins, he created a simple web interface that show him the topology of his entire network. The panel itself runs a live version of Debian, which he configured to load up his Nagios web page each time it is started.
While having the ability to view the status of every network-connected device in an instant is great, he didn’t stop there. While browsing around online, he found diagram for a simple USB-based performance monitor that uses a PIC to drive a pair of VU meters. He hooked the meters up to a router monitored by Nagios, so he can watch office’s bandwidth usage in real time.
If you’re interested in seeing how it was built, be sure to check out the Flickr photo set put together by [Vittore’s] co-worker [Matthew].