how to

MacBook Pro does not boot: steps to fix

23 Sep , 2015  

My MacBook Pro does not boot! Here are the steps that I used to fix it, as a note to myself and to all in the same unpleasant situation. More…

, , , ,

Electronics,how to

Flash NodeMCU firmware to the ESP8266 on a Mac – Guide

30 Aug , 2015  

Flashing NodeMCU firmware to the ESP8266 modules is straightforward using nodemcu-flasher on Windows. On other platforms some command line tools have to be used. Here are my notes with steps to flash NodeMCU to ESP8266 on a Mac.



Hot Plate PID Controller

15 Aug , 2015  

Arduino PID Controller

Low and slow cooking requires precise control of temperature and time. Instead of having to do the controls manually, here’s a little electronics project to precisely achieve a preset temperature over the time: a Hot Plate PID Controller.



how to,Tinkering

root galaxy s3 on mac

21 Jul , 2013  

Android Download screen

This a quick way to root galaxy s3 on mac,tested with android 4.1.2 or better and with the international version of the phone.


, , , , ,

how to

Convert books into PDF taking photos of pages

20 Oct , 2012  

an iPad is mounted for taking photos to convert a book into a searchable PDF

Convert books into PDF taking photos of pages and processing them into a searchable digital backup copy of  that you can take anywhere.


, , , , , , ,


Make PCBs with toner transfer: the laminator method

12 Oct , 2012  

a finished PCB made with laminator and toner transfer

Quick, accurate, cheap and easy PCBs using the toner transfer method with the aid of a laminator and the ikea catalog.


, , , ,


Mini voltmeters are awesome

8 Oct , 2012  

a tiny voltmeter from Hong Kong

These mini voltmeters are really tiny. One of them would be a great addition to any variable power supply project.


, , , , ,


20W Hong Kong led vs conventional lights

29 Oct , 2010  

20W led test rig

Today I tried a 20W Hong Kong led  I found on ebay. It’s a 20 watt model, theoretically capable of putting out 1100 lumens… Unbelievable! One single 10$ led can replace conventional room lighting. See the pics.


, , ,


MassiveLyrics: get all the lyrics for your iTunes library

19 Sep , 2010  

App Icon

Have you ever found yourself missing the lyrics for a song in your iPod, but you don’t want to go search and add lyrics manually to each song in your iTunes library? Then this is the app for you!


, , , ,


Stepperino alpha version

20 Aug , 2010  

circuit mounted on breadboard

Stepperino is a stepper motor controller based on arduino and cheap, commonly available components. This early version is capable of controlling an unipolar stepper motor (5, 6 or 8 wires) in half step mode and is the first step towards more sophisticated control to be achieved in firmware. More…