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Site americano que vende brocas finas
Infelizmente este site não vende para o Brasil e mesmo dentro dos EUA tem restrições para algumas brocas: http://www.mcmaster.com/#standard-drill-bits/=mof7s1
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How to discover the key secret of Master Lock
It is common on movies spies unlocking safes, but now you too can do it for Master Lock: http://www.wikihow.com/Crack-a-%22Master-Lock%22-Combination-Lock
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Using the PCB photoresist APPELATION JH-1609
I bought this PCB photoresist from eBay: http://www.ebay.com/itm/100g-Photoresist-Anti-etching-Blue-Paint-for-DIY-PCB-dry-film-replacement-/190741561459 Then I started searching about this product and...
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How to do metallic via for PCB
This guy implemented a nice way to do metallic via for PCB at home (Portuguese): http://engenhariacaseira.blogspot.com.br Increadible, I want to test it soon!
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Cracking WPS Wireless network
This is the way I tested the security of a Wireless network with WPS enabled. Put your wireless card on Monitor mode: $ sudo airmon-ng start wlan0 Run ‘reaver’ program to crack the WPS: $ sudo reaver...
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WPS: Another Office Suite for Linux
I was looking for the WPS wireless standard and find out this nice chinese Office Suite for Linux: http://community.wps.cn/download/ After installing it you could put it in English this way: $ cd...
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Adding support to kinetis microcontroller on OpenOCD
This is the way I got OpenOCD working to program Freedom board (Kinetis KL25) $ git clone http://repo.or.cz/r/openocd.git Execute the bootstrap: $ cd openocd $ sh bootstrap If you receive this error...
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Controlling RGB LED strip
The RGB LED strips are using a controller chip called WS2811. This chip uses just a single data line (wire) to receive data from a microcontroller. “Timing is everything”, then this chip measure how...
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DIY: Magnetic Ink
I was searching for the developing powder used to reveal the UV ink for PCB and find this nice tutorial about how to do magnetic ink: http://openmaterials.org/2012/07/02/diy-magnetic-ink/ It could be...
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Etching with Air Regenerated Acid Cupric Chloride
This article is interesting for people who want to re-use their etchant over and over again: http://members.optusnet.com.au/eseychell/PCB/etching_CuCl/index.html
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How to put your application to be called from NuttX terminal
In my previous post I explained how to compile NuttX to Freedom board, then a guy asked me how to add his application on NuttX. This tutorial will explain step by step how to do it. It will use the...
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Creating a video from a single image and an audio file
If you try to upload to youtube an audio file you recorded using your smartphone it will not accept because it is not a video. Then the solution is “converting” this audio in video, you can do it using...
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How to create a driver for NuttX?
If you want to create a simple driver for NuttX this tutorial is just for you. I created a small board powered by kinetis KL25 and put NuttX to run on it, but this board has 4 LEDs for user interface,...
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Creating a Touch Sense driver for kinetis
I create a driver for Touch Sense Interface (TSI) of kinetis KL25 using this nice article as reference:...
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Como rastrear encomendas que o muambator nao rastreia?
Muitas vezes você recebe uma encomenda com o codigo “LN000000000US” ou LC000000000US mas que o Muambator mostra como “Tracking Indisponível”. Normalmente estas encomendas são USPS e podem ser...
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Kicad model builder
If you are using Kicad then this tip is just for you. Instead of creating your chip manually you could use this model builder: http://kicad.rohrbacher.net/quickmod.php
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Where is my boat now?
Almost all ships (even some small boats) have a radio to communication and to ask for rescue. I discovered today that using their callsign (their amateur radio number) you could track its physical...
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Using a digital barometer as pressure sensor
This is a nice project developed by Harvard researches. They put resin around a barometer sensor and transform it on a pressure sensor:...
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Snippet code for read manufacturer and device ID of W25X32 SPI NOR Flash on...
This simple snippet of code demonstrate how to read the manufacturer and the device ID of a W32X32 SPI Nor flash using NuttX RTOS : int spi_nor_flash(void) { uint8_t tx[6], rx[6]; struct spi_dev_s *spi...
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Como pagar um fornecedor chines
Atualmente é comum você comprar produtos diretamente da China, sem atravessadores, porém algumas precauções são necessárias. Sites como o Alibaba (Aliexpress) ajudam a encontrar o fornecedor de vários...
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