Category Archives: Gadgets

Morse Learner, tool for learning the morse code (receiving and sending)

Morse Learner is a portable and handy software for learning both the receiving and sending of morse code (chraracters made of DAHs and DITs). In the beginning it starts with small set of characters. And there are options to change … Continue reading

Posted in Basic Tools, For Fun or Interest, Gadgets, Hobbies and Other Interests, Recommended Free Tools, Tools | Comments Off

Second test, trying to use hand-cranked dc motor to charge USB devices (3 Watts working!)

Finally some good news and results. With a 12V DC motor, when used as a generator, it is possible to deliver close to 3.5 W for charging an android phone! This is a continuation to the previous blog. Working setup … Continue reading

Posted in DIY, For Fun or Interest, Gadgets, Hobbies and Other Interests, Tests, Tips | Comments Off

First test, trying to use hand-cranked dc motor to charge USB devices

Background I tried one hand power cell phone emergency charger with disappointing results. The device is very small, and it comes with a promizing USB connector. But when trying to charge either a USB power bank or mobile phone, it … Continue reading

Posted in DIY, For Fun or Interest, Gadgets, Hobbies and Other Interests, Tests, Tips | Comments Off

USB KM switch for sharing Keyboard, Mouse, clipboard and transfer files

With this special USB cable, it is possible to use one Keyboard and Mouse to work with 2 computers (and with 2 screens). In addition, one can transfer files and share the clipboard. In Wikipedia, it is called “Easy Transfer … Continue reading

Posted in Anvanced Tools, Gadgets, Security Threats, Tests, Tips | Comments Off

Challenge: How to estimate angles for objects in the sky

I’m novice when it comes to looking planets via telescope. Well, I actually would like to take decent photos but have realised that it is not as easy as it sounds… One of the basic skills when searching planets, or … Continue reading

Posted in DIY, For Fun or Interest, Gadgets, Hobbies and Other Interests, Tests, Tips, Tools | Comments Off

Simple LED detector for RFID or NFC of 13MHz, without any battery

Triggered by experience with “Raspberry and RFID reader/writer, first test “, I tested a simple LED RF detector idea that can be found in “RFID detector” and “RFID Reader Detector and Tilt-Sensitive RFID Tag “. For 13Mhz RFID/NFC, the LED … Continue reading

Posted in DIY, For Fun or Interest, Gadgets, Hobbies and Other Interests, Internet of Things and M2M, Raspberry Pi, Recommended Free Tools, Tests | Comments Off

Raspberry and RFID reader/writer, first test

An RFID system is always made up of two components: the transponder, Proximity Integrated Circuit Card (PICC) the detector or reader , Proximity Coupling Device (PCD) The RFID reader/writer (13.56MHz) RF522 for arduino can be used in Raspberry. In this … Continue reading

Posted in DIY, For Fun or Interest, Gadgets, Hobbies and Other Interests, Internet of Things and M2M, Raspberry Pi, Robotics, Tests | Comments Off