IoT Sensors – Data Collection

In the first part I talked mostly about the sensors and the gateway so in this article I’ll show you how to collect, filter and store that data from the sensors. My setup is running locally on my LAN and uses a Raspberry Pi 3B+ to process the data. I’ll be using Node-RED to process …

How to use Amazon S3 from KNIME

This post follows on from my S3 post usng Node-RED so you can read that for a brief into to S3. Using S3 with KNIME is extremely easy as there is already an S3 node available to install. Amazon S3 Connection The only node that needs installing is the Amazon S3 Connection. All the other …

Format and Mount External Hard Drives in Linux

Assuming you’ve just bought a new external hard drive or you have one that’s already in use these are the steps you need to take to make it usable with Linux. ⚠️ Be aware that following these steps will reformat the drive causing all data to be permanently erased. You’ve been warned. First connect the …

IoT Sensors – Getting Started

Introduction I’ve been interested in setting up some home monitoring/automation since getting my first Raspberry Pi a couple of years ago. After using the device for various development projects I finally decided on my first project, try to make a basic home temperature/humidity monitor that cold measure both indoor and outdoors. The idea is to …

Recovering Node-RED Flows After Changing Hostname

I recently changed the hostname on my Raspberry Pi and was rather surprised (and initially worried) when the next time I started Node-RED all my flows has disappeared 😱 It turns out that the flows are connected to the computer hostname by their naming convention. Someone even filed a bug regarding this unexpected behavior. The …

Piping Bitcoin RPC Commands

If you want to get the block header of the latest block generated on the bitcoin blockchain using bitcoin-cli it’s a little tricky (and hard to say!). You need to first find the latest block number (height), then find the hash of that block and then get the header using the hash. Since the getblockheader …

IoT with Node-RED and Python

Now I have two Raspberry Pis running, one as a Bitcoin full node and the other mostly used as a dev/experimentation machine I decided it’s time to put the dev machine to some use. I’d also like to learn more about IoT (Internet of Things) and how they are wired together and communicate so this …

Introduction to Image Classification using UiPath and Python

After my previous post showing image classification using UiPath and Python generated many questions about how to implement the same I decided to expand upon the theme and give a more detailed description about how to achieve this. My starting point was thinking how I might integrate UiPath with python now that it’s integrated within the platform. I find …

How to use Amazon S3 from Node-RED

Amazon S3 (Simple Storage Service) is a very commonly used object storage solution that’s cheap to use and highly reliable. Think of it as a file system in the cloud with enterprise features that you can use to store almost anything. Amazon S3 This guide assumes you already have a working Amazon S3 account and …