Category: Examples

Wire IoT devices

Smart environments use a lot of servers, containers, and devices. Sometimes you need a lightweight system to connect and monitor these devices. IoT devices offer multiple open systems, but how can you wire them? Node-Red [1] is an open-source system based on NodeJS that fulfills this requirement. IBM initialed Node-Red. One year ago, I was […]

NextCloud on Raspberry Pi

Last year I decided to test Nextcloud [1] on a Raspberry Pi II. Before this installation, I had gained experience with ownCloud on the Raspberry Pi. However, I found the setup of the webserver, database and in-memory cache and message broker complicated. As a solution, I found NextCloudPi [2]. NextCloudPi provides virtual machines and docker […]

ERC-721 Star Notary Service Arc42 (DE)

1.0 Einführung und Ziele Star Notary Service erlaubt es, Sterne mit Koordinaten in der Ethereum Blockchain zu speichern. Diese Applikation ist eine Demoanwendung, welche die Funktionsweise einer DApp demonstriert. Es wird die Funktionsweise von Solidity und Interaktion mit Javascript vorgestellt. 1.1 Aufgabenstellung Die Anwendung implementiert den Ethereum ERC-721 Token Standard als Solidity Smart Contract. Der […]

Ethereum ERC-721 Star Notary Service

Star Notary Service allows you to create stars with coordinates in the Ethereum Blockchain to save. This application is a demo application, which the functionality of a DApp demonstrated. The functionality of Solidity and interaction with Javascript. The application implements the Ethereum ERC-721 Token Standard as a Solidity Smart Contract. The web frontend uses Javascript. […]

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