Category: Arduino

Sep 02 2017

4 Character 7 Segment Display

4 Character 7 Segment Display

I built another handy circuit to ‘house’ a 4 character 7 segment display. It looks like this: Basically it just ‘breaks out’ the 16 pins of the display with two 8 pin female headers. Pins 1-8 are connected to the header at the bottom and pins 9-16 are connected to the header at the top. …

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Aug 28 2017

I2C 2-wire Circuit

I2C Circuit

My latest project involves collecting data from a number of sensors connected to multiple Arduinos. I2C (or 2-wire) is a perfect fit for this project because I needed an easy way to connect the Arduinos and aggregate the data. With I2C, I can have one Arduino as the master and several other Arduinos as slaves.  …

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Apr 24 2017

SSD1306 OLED Displays

OLED Display attached to an Arduino Nano

For many Arduino projects, there is a need to display information graphically or display more text than what fits on a 16×2 LCD. For that need, consider using SSD1306 OLED Displays. SSD1306 refers to the controller or driver chip for the display. OLED or  Organic Light Emitting Diodes refers to the dot-matrix graphic display system. These …

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Apr 13 2017

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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Mar 07 2017

Hacking your Car with an Arduino and a CAN BUS Module

CAN BUS Module

Your car is full of electronic devices. In fact, General Motors is one of the largest computer manufacturers due to its need of microcomputers in cars that it makes.  If you have an interest in what goes on with your cars’ electronics, you might want to invest some time hacking your car with an Arduino …

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Jan 25 2017

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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Dec 24 2016

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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Nov 24 2016

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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Nov 10 2016

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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Nov 07 2016

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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