Coding

I have for quite some time now been thinking about measuring the water temperature in Lake Vättern. One step on the way was the temperature sensor in the much smaller lake Rocksjön that's located in Jönköping. That was back in 2013-12 years ago-and I have not done anything since then relating to LoRaWAN and temperature sensing. But this summer, I got [...]

As previously mentioned I did som exploration of ESP32 mesh functionality and RGB leds for a project involving the local maker space where i failed to force mesh node status. After I gave up on that idea I managed to create som fun stuffs with the LEDs instead. The code is available here First iteration was to just have the LED blink in a chosen [...]

The local makerspace has a project for an upcoming light parade that will be held in the old ex-industrial area where we have our space. The idea is to have a bunch of ESP32 devices meshed together with RGB LEDs creating synchronized effects across the parade route. To make this work, I needed some nodes to always be root nodes (connected to the [...]

For several years now I have hade a string of Neopixel RGB Christmas lights in the Christmas tree that was controlled by an old Python script on a Raspberry Pi. Since I would forget how to set it up between Christmases I simply bundled the string and the RPI with the box and just started it up the next year. This year I got some extra Christmas [...]

I have previously posted texts regarding my adventures in RGB-panel land, first here, and then here. To make the office a bit extra Christmassy this year i decided that I wanted to display some scrolling text (no problem at all) with emoji (great problems). The fonts supported by drivers for these panels have letters, and just the boring ones, not [...]

To be able to measure the Wifi quality over time I created a small program for ESP32, probably works for ESP8266 also, that every five minutes reports the ping RTT to the local gateway and the RSSI to the connected AP. The idea is to get a handful cheap ESP32 boards and litter them around the house and send the data to influx-db to be able to create [...]

I have a handful of cheap ESP32 development boards, and some expensive, that all sometimes gives me the error A fatal error occurred: Could not open COM6, the port doesn't exist. But I have found a workaround. The simplest way I found is to start with opening the Serial Monitor (in Arduino IDE) to see the status of the com-port easily. Then unplug [...]

During this latest DreamHack event here in Jönköping (DHW23) I did some small updates to the Alertsquarer previously featured here. SG had bought some new hardware so instead of three 32x32 panels there was now two 64x32 panels. So while fixing support for this, and doing some minor adjustments I also added support for loading and displaying PNG-images. [...]

A friend at En Produktions Byrå was assigned to design a section of a Fagerhult exhibit for their permanent showroom located at the headquarters. The display consists of several clusters of buttons, resembling vintage radio buttons where only one can be active at a time in each group. A sophisticated display mounted on an adjacent wall is controlled [...]

A friend who works at Dreamhack asked me if I had any 24 led Neopixel-rings in my large store of good-to-have stuff. Unfortunately I didn't, I could only find 12 led ones. In the crew area for the tech/network crew at Dreamhack in Jönköping they have had a display that show the number of active alerts per team. So anyone easily could see if any area [...]

Waveshare RP2040-Lora adventure

Success with ESP32 Mesh

Problems with Forced Mesh Node Status in ESP-IDF

Xmas tree upgrades

LED-Scroller with Unicode support

Simple WiFi monitor with ESP32

Arduino – The port doesn’t exist

Alertsquarer v1.1

Buttons and LEDs

AlertSquarer for DH