Jun 27 2016
I made another circuit to display TV Video output from the Arduino. It uses the TVOut library (documented at the TVOut Arduino Playground) which can be used to output an NTSC or PAL video signal. The circuit is actually just a means of adding three resistors to an RCA video cable. Instead of cutting a …
Jun 20 2016
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 …
Jan 21 2016
Recently, I created this simple circuit (and corresponding code) which makes an emergency phone call alert to an Arduino via an Asterisk PBX. This project was for someone who needed to be alerted (silently) if someone made an emergency phone call on their Asterisk PBX. By the way, the free and open source Asterisk PBX …
Oct 15 2014
With just a few sensors, one can determine a lot about the weather. The BMP085 can be used to sense barometric pressure and temperature and the DHT11 can be used to sense humidity and also temperature. Here is what they look like attached to a mini breadboard: …
Sep 26 2014
It is sometimes very handy to be able to control mains electric via an arduino to turn things like lights on and off. [warning]BE VERY CAREFUL hooking up any mains electricity. [/warning] I built a dual circuit so that two things can be controlled from one board. Here is the fritzing graphic: Once built, …
Sep 26 2014
One of the problems of connecting an HD44780 LCD to an arduino is the number of pins taken up (usually 6). There is an older article here for hooking up an HD44780 LCD to an arduino with only 3 pins. (Note: There is an alternate link here as the original link may be down.) The …
Sep 03 2014
Shown below is one of my DIY Arduino circuits. The circuit does not have the FTDI chip built in. The FTDI circuit is only needed for programming and cutting out un-necessary components saves a bit of money. The ICSP connection (6 pins comming out the side) on …
Sep 02 2014
A few days ago my son bought me a birthday present. It was a BusPirate from SparkFun. This is what it looks like plugged into a breadboard. The BusPirate is quite a handy circuit. I have used it to flash a BIOS chip using FLASHROM and also program an AVR ATMEGA 328P with AVRDude. It …
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