http://elger.org/wiki/ 2026-10-02T15:41:14+02:00 http://elger.org/wiki/ http://elger.org/wiki/lib/tpl/prsnl10/images/favicon.ico text/html 2016-11-16T13:06:54+02:00 http://elger.org/wiki/projects/i2c_pcf8574_8bit_port_expander?rev=1479298014&do=diff I2C pcf8574 8bit port expander I made a test / prototype setup on a breadboard with two pcf8574 ics ; one for output and one for input. Both connected to the same I2C bus. Adding more digital inputs to an Arduino was my first objective, as I am planning to use this on a project which has buttons that control a menu. text/html 2016-11-16T13:06:54+02:00 http://elger.org/wiki/projects/lcd_module?rev=1479298014&do=diff I2C LCD Display I bought an I2C display on ebay and by the description it seemed it just might work out of the box... But it didn't ... Here is a description of how I got it to work, so next time I do not have to invent the wheel again. My display has a PCB on the back labled text/html 2016-11-16T13:06:54+02:00 http://elger.org/wiki/projects/ledcube?rev=1479298014&do=diff The Cube was not my idea, I stumbled upon a video of a LED cube while researching the arduino. I found the LED cube so awesome that I decided to make one myself. Now it has been build, I can understand why you can't really buy one. If you find a company that produces it, it is ridiculously expansive. And that is because it takes a lot of time just building the thing. text/html 2016-11-16T13:06:54+02:00 http://elger.org/wiki/projects/spectrumanaliser?rev=1479298014&do=diff It took one night of hardcore hacking, and it works nicely :-) Thanx Psy. I used: * an Arduino Uno (clone) * 2x Sure Electronics DE-DP14211 * HT1632c library Code by wildstray * Fast Fourier Transformation library Code by #makefurt Here is a write-up of the hardware. And a short note on the text/html 2016-11-16T13:06:54+02:00 http://elger.org/wiki/projects/steppermotor?rev=1479298014&do=diff Steppermotor controlled by Arduino This is a short how-to on controlling a bipolar stepper motor by an Arduino and a L298N based dual H-bridge controller board. For a long time I thought about playing around with a stepper motor. The goal for this page is not to explain what a stepper motor is, but to document for myself What I did so I can reproduce the results at a later time.