Follow mercenarymind on Twitter
Micro
How to make a contact-less digital tachometer using IR-light reflection technique
Written by Administrator   
Thursday, 09 June 2011 00:00


This is a very basic lesson on how to make a contact-less digital tachometer using infrared light reflection technique. It can measure RPM up to 99960 and the resolution is 60 RPM.

How to make a contact-less digital tachometer using IR-light reflection technique –[Link]


Last Updated on Thursday, 09 June 2011 01:58
 
Updated web server on a business card
Written by admin   
Wednesday, 08 June 2011 00:00

Authors: admin


megabug posted an update on the web server on a business card: 

I am using my own board, but changed the code to fit the Web platform!

My board is based on an old board from Ian, which was posted on hackaday.com but now with SMD Ethernet jack, dsPIC33FJ and other changes. ;)

There are also some information on my website

Updated web server on a business card – [via]

Last Updated on Wednesday, 08 June 2011 02:48
 
Three DIY Battery Holders – For those low power projects
Written by Administrator   
Sunday, 05 June 2011 00:00

battery


Three tips for an instant coin cell power plant for your MSP430. Use props from electrical tape to Neodymium magnets. Pics after the jump. image

Read more http://feedproxy.google.com/~r/Four-three-oh/~3/rkYjW40yXVw/

Last Updated on Sunday, 05 June 2011 16:47
 
Handy battery analyzer
Written by Administrator   
Sunday, 05 June 2011 00:00

Market is flooded with batteries. It is hart to select and trust the ratings. If you want to be sure your project will run predictably from selected power source it is best to measure characteristics by yourself. Elm-chan has built a battery discharge analyzer some time ago that proved itself.

It is based on Atmega48 microcontroller which reads data parameters while it’s being discharged. Battery analyzer supports three load modes that imitate different applications: constant current (imitates linear regulator), constant power (imitates switch mode power circuit) and constant resistance (imitates lamp, heater). Circuit logs data via RS232 interface that can be recorded to file for graphing and analyze. Analyzer additionally can measure internal series resistance of battery (ESR).

Read more

Last Updated on Sunday, 05 June 2011 17:19
 
41 LED Flasher Circuit using 555 IC
Written by admin   
Thursday, 02 June 2011 00:00

Authors: admin


supes writes:

I made this as a quick project I made to use a lot of the LEDs I recently got. It basically connects via a 555 8 pin IC and allows for adjusting the time between the flashings by changing the resistor or capacitor values. It provides for a cool looking effect in a dark room. Use your favorite color LEDs and enjoy!

41 LED Flasher Circuit using 555 IC –[Link]

image

Last Updated on Wednesday, 01 June 2011 23:16
 
<< Start < Prev 1 2 3 4 5 6 7 8 9 10 Next > End >>

Page 6 of 31