Chandana's Blog

24x8 LED matrix marquee display is implemented around the PIC16F877 with three DS7221 as the LED drivers. Each DS7221 can drive 8x8 matrix t...

I was traveling in the car with my kid (who is 2 years and 9 months old) on the way to his pre-school. A thick black smoke came from a doubl...

I've explained what has happened to my humidity sensor (SHT11) due to an accident in one of my previous posts. I told the same story to ...

MAX187 12-bit ADC with 3v external reference provided a sufficient resolution for the altimeter. To make the calculation accurate, a tempera...

I got four pressure sensors (two MPX4250 and two MP3H6115A) from freescale sometime back. I tried the two 4250s but they didn’t work for som...

This simple PIC circuit can be used to pre-program the on/off time of 230v electrical appliances. The PIC is programmed as a clock and at sp...

Electronic components are very sensitive. Anything beyond the tolerable range within a fraction of a second is enough to destroy most of the...