Re-flow Soldering; what Mom never taught me about cooking!

August 24, 2012
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Re-flow Soldering; what Mom never taught me about cooking!

Having worked in the electronics industry for 30+ years I have had my fair share of problems making the change to surface mount technology (SMT). As a hobbyist I thought of SMT soldering as a new source of hair loss. Yet the lack of plated through hole (PTH) components has finally pushed me to embrace…

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iMX23 Linux

August 17, 2012
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iMX23 Linux

I have been looking to design an open source Linux design that could be built at home. The problem so far has been that the processors supporting Linux tend to be manufactured in BGA packages which makes them difficult to build. The iMX23 solves this by offering an ARM9 core in a 128 pin LQFP…

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Packaging the ATMega128RFA1 Radio

August 16, 2012
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Packaging the ATMega128RFA1 Radio

I am exploring the capabilities of 3D printing and am always looking for an excuse to make some new object. After designing the AVRRF radio board I thought wouldn’t it be cool if I could build a small package to hold the board. I decided on a two piece package described below. I captured the…

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Wireless Zigbee Radio

August 15, 2012
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Wireless Zigbee Radio

As part of the quadracopter telemetry system I want to be able to wirelessly send flight data back to the ground station. The obvious choice would be some sort of wireless module however this solution cannot be integrated as tightly as an RF transceiver chip and some code. Then I came across the Zigduino that…

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IMU Sensor Board

August 14, 2012
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IMU Sensor Board

The sensor board provides a 3.3V 6DOF sensor system which includes an accelerometer and gyroscope. The physical sensors are the L3G4200D gyroscope and MMA7455L accelerometer which are described in detail in the associated datasheets. This board also terminates the radio and ESC PWM signals which are ~5V so the ATmega48 is run at a nominal…

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New quadracopter hardware

August 13, 2012
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New quadracopter hardware

I have re-designed the hardware for the quadracopter, moving from the LPCExpresso board to a smaller purpose built board. The LPC1769 is designed to run on one PCB and controls all of the sensors located on a single daughter board. The processor board consists of the LPC1769 processor configured to run as a USB memory…

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