Afonso Duarte - Oráculo - Tech Blog

Afonso Duarte

Mifare 1k key recovery - with concealed reader

Hardware Hacks Featured

Mifare 1k key recovery - with concealed reader

I'm a practical learner and sometimes you learn by simply doing - sometimes you fail, sometimes you succeed. Today, I succeeded. This post is about NFC cards that need you can top up with some amount of money (for laundry, car wash, et al), then you simply insert

The Network Oracle - Automated network dependency discovery tool

The Network Oracle - Automated network dependency discovery tool

My take on a simple and fast network discovery tool that provides a layer 4 dependency chart.

Tutorial: OPNSense IPsec VPN to OCI (Oracle Cloud)

Tutorial: OPNSense IPsec VPN to OCI (Oracle Cloud)

🍭I originally wrote this based on VTI which wasn't working as expected - well, it worked because of a typo which made this fall back to policy based! Hence this article is corrected and designed as policy based routing. I had to write this down after more than

DIY Lab PSU

This post is a work in progress. Bought a cheap project box. Paper tape and caliper allowed for quick sketch of component location. I had a chinese all in one PSU which acts as a buck converter down from 40V inputs. My requirements: * Up to 20VDC output * 4 amps * Small,

EVSE Charger - reloaded

EVSE Charger - reloaded

The quest for the perfect inexpensive EVSE

HP Elitedesk 800 G1 SFF - w/ ~29*TB raw storage

Hardware Hacks Featured

HP Elitedesk 800 G1 SFF - w/ ~29*TB raw storage

An odyssey on adding nearly 30TB of storage to a small form factor computer.

home automation

The prototype for the environmental sensor

A while ago i wrote about my endeavor of designing my own home Environment Sensor, with an array of interesting sensors (CO2, Temperature, Humidity, Barometric Pressure) and connected to my HomeAssistant instance - you can read more about it here. However, this was meant to be pretty and to stand

When the prototype nearly becomes the final product

home automation

When the prototype nearly becomes the final product

I've written recently that i quickly designed an ugly looking dev board for my home environment sensor in order to make a more complete prototype with a living room clock. Then i learned about the m5stack device which is an all-in-one prototyping solution with some sensors, display, battery

m5stack Fire v2.6 Living Room Clock and environment sensor

home automation

m5stack Fire v2.6 Living Room Clock and environment sensor

I've been at this for a while and it's a fun project. It essentially shows current Time (sync'd via NTP), weather conditions (courtesy of OpenWeatherAPI - where i pre-downloaded all the logos to flash and simply identify weather status with the corresponding icon), and

My own design for a home environmental sensor

home automation

My own design for a home environmental sensor

My hacked IKEA Vindriktning has problem: apart from my washing machine, it's the only full white thing I have at home (I checked!) Thought about painting it black, but the pure hassle of taking it apart, masking, sanding, primer, painting, ... 😩 So why would I spend 2h doing this

Pimp your IKEA Vindriktning

home automation

Pimp your IKEA Vindriktning

(in harsh military voice) This is my Ikea Vindriktning. There are many like it, but this one is mine! The Vindriktning is a 2.5 PPM particle counter meant to serve as an overall indication of interior air quality. It's pretty dumb and unpronounceable by western standards -

A home made UMTS Yagi antenna and repeater

A home made UMTS Yagi antenna and repeater

DIY 3G Yagi with TP-Link hotspot.