Tutorials, tips, tricks and knowledge around the Internet of Things and Embedded Systems. The goal of this blog is to explain not only how to implement a solution in code. I also explain important details about the wireless protocols or technologies. Choose your desired topic and get started!

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Arduino
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Latest Posts

  • Raspberry Pi 4 – Blinking patterns of green ACT LED

    On a Raspberry Pi 4, the green “ACT” LED indicates boot errors using certain blinking patterns. The following table shows what the different patterns mean (source of the table is the official documentation). Hint: In case your LED does not flash, or turns completely of after some flickering, your EEPROM bootloader might be corrupt. InContinue reading “Raspberry Pi 4 – Blinking patterns of green ACT LED”

  • DIY Temperature Logger

    DIY Temperature Logger with DS18B20 and ESPHome / HomeAssistant

    I needed a simple way to measure and log the temperature of the heating pipes in our house. The DS18B20 is a well-known and commonly used temperature sensor, and I already have Home Assistant running. So in this post, I want to guide you through the build of a temperature data logger that can easilyContinue reading “DIY Temperature Logger with DS18B20 and ESPHome / HomeAssistant”

  • Setting up Home Assistant with two MQTT brokers (using MQTT bridge)

    Home Assistant only supports subscribing to one MQTT broker. This is a problem, if you get sensor data from multiple different brokers and want to display them in your dashboards. So in this post, I will show you a solution on how to configure one of the brokers as an MQTT bridge. By doing this,Continue reading “Setting up Home Assistant with two MQTT brokers (using MQTT bridge)”

  • vmware esxi to proxmox

    Migrating a simple server from VMware ESXi to Proxmox PVE

    I just migrated a rather small server from VMware ESXi 7.0 to Proxmox 8.1.3 hypervisor. The server had two virtual Windows 10 machines. I document the steps here, in case it might be helpful to someone in the same situation. Step 1: Install a new, empty drive Insert a fresh SSD in the server andContinue reading “Migrating a simple server from VMware ESXi to Proxmox PVE”

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