Category Archive: Circuits

Jul 03

ESP8266 DIY Programmer Cradle

If you have been reading my posts lately, you will notice that I have been working a lot with the ESP8266 wireless module. To make it easier to work with, I made an ESP8266 DIY Programmer Cradle. Here is what it looks like (without and with the ESP8266 plugged in):           …

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Jan 25

DIY Arduino 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

Updated DIY Arduino Uno

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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Jun 27

TV Video Output from the Arduino

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 …

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Jun 20

LM317 to output 3.3 Volts

LM317 3.3 V Circuit Top View

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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Jan 21

Emergency Phone Call Alert to an Arduino via an Asterisk PBX

S108T02 Relay Circuit

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 …

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Oct 15

Arduino Weather Station

Arduino Weather Station

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 …

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Sep 26

DIY Dual Relay Circuit

Dual Relay Circuit

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, …

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Sep 26

3 PIN HD44780 LCD

LCD Shift Register Circuit

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 …

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Sep 03

DIY Arduino Circuit Board

DIY Arduino Circuit

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 …

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