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Paul Gallagher
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168 followers
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the blog has moved..
Seeing this post? Then you've landed on one of my archived blogs. I've since consolidated all the content posted here on a new site at blog.tardate.com . It is actually built with Jekyll and the sources are actually freely available on GitHub .

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LittleArduinoProjects#222 Stair-step Generator
Once again I'm inspired to go and build a circuit by yet another great tutorial from w2aew . This circuit generates a stairstep waveform by an ingenious combination of 3 circuit elements: a "high" (265Hz) frequency pulse (555 timer) provides the charge to s...

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LittleArduinoProjects#221 XOR with Resistor-Transistor Logic
Exclusive OR (XOR) operation is true only when the inputs are different. An XOR may be constructed using combinatorial logic: an OR ANDed with a NAND. But can it be done with even more basic discrete components? This circuit uses a diode-bridge and a single...

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LittleArduinoProjects#220 Arduino gcc toolchain
The Arduino IDE is the most convenient way to get started with Arduino, but it does obscure the underlying mechanics of building software for an Arduino. How to do it from scratch? This is my experiement and guide to building software for an Arduino from th...

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LittleArduinoProjects#219 DS18S20 1-Wire Reading
Another way to measure temperatures, this time the DS18S20 - an inexpensive 1-Wire digital thermometer with a range of -55°C to +125°C, at ±0.5°C accuracy from -10°C to +85°C. It comes in TO-92 packaging and may be powered directly (using three pins), or ta...

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LittleArduinoProjects#218 MPU-6050 3-Axes Accelerometer Gyroscope Module
I'm planning to build a controller that needs motion detection, so got hold of an Invensense MPU-6050 3-Axes Accelerometer Gyroscope Module to see if it would do the trick. The module conveniently operates on 3-5V. All I've done so far is a simple sketch to...

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LittleArduinoProjects#217 Basic AVR-controlled Buck Converter
Buck converters are switching power supplies configured such that the output voltage is lower than the input voltage. Since the primary components (inductor and capacitor) ideally consume no power, high conversion efficiencies are possible. In practice of c...

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LittleArduinoProjects#216 OSHChip driving SPI LED module
How easy is SPI with the OSHChip? I thought I'd find out by first controlling a module that has a very basic SPI-ish slave interface. I'm using the LEDx16Module that I designed in the KiCad like a Pro course from Tech Explorations. It has dual 74HC595 shift...

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Feature Lifecycle Analysis with PivotalTracker
Can you trust your agile planning process to deliver the best result over time? In an ideal world with a well-balanced and high-performing team, theory says it should all be dandy. But what happens when the real world sticks it's nose in and you need to dea...

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LittleArduinoProjects#215 OSHChip yotta toolchain
After bruising myself on the raw gcc toolchain - and although I got a program running - I think I want my toolchain to do more of the hard work for me! So next I tried yotta, the software module system used by mbed OS. Building a simple program using the Of...
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