In part 1 on How to make a POV display we talked about the hardware and schematic. In this part 2 we will dive in how the code works and why the POV (Persistence Of Vision) display is so cool and fun to play with.
Thursday, June 25, 2020
Tuesday, June 23, 2020
Build a wireless energy POV display propeller clock with Android app
Thursday, January 23, 2020
How to make a double sided ultraviolet exposure box for making PCB
I had a broken Samsung MM-N6 audio system and so I've decided to build myself a double sided UV exposure box using it's front panel since it already had an LCD display, buttons and a sliding motorized panel. The sliding panel can be replaced with a door.
Here is an overview video with the version 1 of the box. This article presents an improved version of this box.
Saturday, September 7, 2019
Setting preferred units in Eagle CAD to metric or imperial
SET Interface.PreferredUnit nwhere n can be:
0 - the default value. Eagle decides if will display metric or imperial
1 - imperial
2 - metric
To change current units in Eagle CAD, simply paste the command in the command line, replace the n with your preferred value and press enter. To confirm that it worked, open the DRC window.
Imperial units in Eagle CAD DRC window |
Metric units in Eagle CAD DRC window |
Monday, August 19, 2019
How to build a zener and LED diode tester using a 555 timer DIY
If you have a bunch of salvaged Zener diodes you need a quick way to sort them. In this article I describe how to build a simple test equipment that can be used to measure the breakdown voltage of a Zener diode. It can also be used to test LEDs and their color, since sometime a color LED can look white when not lit. This Zener tester is powered from a 9V battery so it doesn't involve dangerous mains voltage and can measure diodes up to 90V with the help of a 555 timer boost converter.
I also use it for checking for burned LEDs in a mains light bulb.
Thursday, June 27, 2019
How water flows inside a washing machine
Monday, December 31, 2018
ESP8266 library for EFM8 microcontrollers - Server mode
Of course this is not a real web server although with an SD card whole HTML pages could be served. The purpose of this library is to extract queries from a URL requested by a client. This way for example you could change color and brightness of an RGB led using a color wheel in a phone app or control home appliances from anywhere in the world.