It has been a while that I wanted to leverage the power of ESP-8266 NodeMCU to monitor my aquarium. My first experiment is to read the water temperature every x interval and upload it to ThingSpeak. For this experiment, I need: ESP-8266 NodeMCU; DS18B20 waterproof sensors, which I bought from Amazon; 4.7kΩ resistor. The setup … Continue reading Simple Aquarium Temperature Sensor
Applying De Morgan’s First and Second Laws using digital TTL ICs
Today, we are going to carry out a simple experiment using logic ICs to apply De Morgan First and Second Laws. They state that: – the negation of a disjunction is the conjunction of the negations – the negation of a conjunction is the disjunction of the negations Wikipedia Let’s keep the theory in the … Continue reading Applying De Morgan’s First and Second Laws using digital TTL ICs
Creating a Policy with PowerShell
An easy way to create new Policies in Azure is to use the Portal and duplicate an existing policy. However, when working with Infrastructure as Code, using the manual process is not ideal as the new policy won’t be part of the code. An option would be to export the existing policy and update the … Continue reading Creating a Policy with PowerShell
BCD Switch
Last time we started to look into digital electronics. One handy building block for our experiments is the facility to provide input values to our circuits. An easy way to do is by using DIP switches but I find it always difficult to toggle the positions of the switches. Also, sometimes we want to provide … Continue reading BCD Switch
Electronics Cheat Sheet
One important beginner’s tool for his electronics lab is the cheat sheet. This is a double sided A4 page with the main references for your daily electronics need. Here is the one that Clounce prepared and uses during his experiments. Download your copy from my github repository. As described in the readme.md file in my … Continue reading Electronics Cheat Sheet