Analog Noise and RC filter

Following the posts about Botanix and Effectively killing a plant the project will use an analog soil moisture sensor. As the Raspberry Pi only has digital inputs conversion is needed – enter MCP3008. An Analog to Digital Converter (ADC), as the name suggests, converts analog signals – current levels – into digital values. The MCP3008 converts current…

Controlling Murphy’s Law

Watering plants with Botanix in-door requires certain precautions. To pump water to the plants I have a 12V pump that is going to be controlled by a relay connected to a GPIO on the Raspberry Pi – pretty straight forward. But as a firm believer in Murphy’s Law I am convinced that the computer will crash or…

Flash Grid Light Modifier

Rummaging through some old stuff I stumbled upon a flash grid I build out of straws a couple of years back. My interest in photography has evolved over the years and for the last couple of years been focused on flash and studio photography. Placing a grid on a flash will focus the light which…

AirPatrol

The goal of AirPatrol is to build a sensor array to monitor environmental parameters in my home. In a household with a 4 year old and a 6 year old a good way to engage them in the project is make sure they can relate. To achieve this the project naming was inspired by the…

Effectively killing a plant

Building a plant watering system it seems like a good idea to monitor soil moisture. Originally, I planned to use pretty standard moisture sensors and have bought a bunch of the LM393 based type shown above. However, after receiving the sensors I stumbled upon the article Sensing Soil Moisture: You’re Doing it Wrong. I decided to…

Botanix

I have a hard time keeping herbs alive in my windowsill and as a software engineer I have a deep felt love for automation. And I like designing and building stuff. So I would like to build an automated plant monitoring and watering machine for my kitchen windowsill. Hardware Requirements These are the requirements I…

First light

Welcome to my website! It has undergone a couple of re-boots by now. Hopefully now I have settled on a format and the content type that I want to focus on. Instead of spanning everything I might be interested in I will now focus it on the technical projects I tinker with in a blog…