Category: Informational

ARM Cortex M3 STM32F103C8T6

STM32F103C8T6 with ST-LINK V2

It’s amazing what you can get in a microcontroller board these days for just over $2. For example, just search ebay.com or alibaba.com for the key word ‘STM32F103C8T6’.  You will see the links to an ARM Cortex M3 STM32F103C8T6 development board for just over $2 US including shipping (usually from China, so it may take …

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PIC Assembler Coding

PICKit2 Clone Programmer

I became re-interested in Microchip PIC assembler coding recently. I hadn’t really used it for a number of years (since before 2009). The ‘C’ language is usually efficient enough and easier to code for most projects I do. I used one of my DIY PIC18F4550 Pinguinos for experimentation. As you might guess, I decided to …

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DIY Arduino Shield

DIY LCD Shield

An Arduino shield is basically another circuit board that plugs into the Arduino and extends its capabilities in some way. So, of course, if you create your own DIY Arduino, you have to create a DIY Arduino shield. I needed a way to attach an HD44780 LCD to my DIY Arduino so I created a …

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Updated DIY Arduino Uno

DIY Arduino [Side View]

I have a new version of my DIY Arduino UNO. It is somewhat different than the old one that I have written about before (HERE).  I moved some components around on the board, added the user LED and moved all the wiring to the bottom of the board. Here is a picture of what it …

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Experimenting with Arduino-Builder

Arduino IDE

Lately, I have been experimenting with Arduino-Builder. It was been available as a command line interface to compile sketches since version 1.6.6 of the Arduino IDE.  It is actually what the Arduino IDE invokes behind the scenes to compile the sketch. It is written in the Go language. The source code is available HERE on …

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An ATmega328 with two Identities

Arduino as an ISP

Some would say that an ATmega328 with two identities is not possible. However, it depends on who you ask.  🙄   First though, before we ask, here is some necessary background information. Microcontrollers from Atmel (AVR) and Microchip (PIC) have a built in ‘signature’ or identity. This signature is a unique code that identifies its …

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If you have the time

RTC DS1307 Back View

The arduino does not have an RTC (Real Time Clock). However, it is trivial to add one.  And if you have the time, you can do a number of interesting things with your arduino, limited only by your imagination. I am using the DS1307 RTC module which looks  like this:           …

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Flashrom and an Arduino at 3.3V

Arduino Flashrom Programmer

Flashrom is an amazing piece of software and a life-saver when you need it! If you’ve tried to update your BIOS before using manufacturer supplied software and something went wrong, then you know how valuable Flashrom can be. I’ve written about Flashrom and the BusPirate in a previous post HERE. However, I just found out …

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LM317 to output 3.3 Volts

USB to Serial Cable

I created a simple circuit using the LM317 to output 3.3 volts from a 5V or greater input voltage. Why? Because, a number of modules for the Arduino (or Pinguino) take 3.3 Volts. It’s true, some of the Arduinos do have a 3.3V voltage regulator (and thus a source of 3.3V), however, that might not …

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Serial Port Communication via Python

There are many Linux (and Windows) programs ‘out there’ that allow you to do serial port communications.  However, I needed some things that those programs did not provide (on my Linux system) so I came up with my Serial Port Communication via Python script. If you want something that you can learn from and/or customize …

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