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 […]
Category: Examples
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. […]
myStarBlockchain a Ledger in Javascript
This Example implements a HapiJS Restful Services that register coordinations of stars. The services run on a NodeJs Services and use LevelDB to persist data. A simple massing Blockchain Services entirely in Javascript. myStarBlockhainJS
Organic Oil Manufacturer
Organic oil manufacturer Ethereum Dapp example. It illustrates the supply chain from the farmer to the customer as a smart contract. Business Story The organic farmer Bob produces exclusive rapeseed oils. Bob presses the oils in a nearby rapeseed mill. Afterward, he sells the oils at the farm shop. The oil is bottling in one-liter […]