BUILD YOUR OWN PC OSCILLOSCOPE

Do you want to build your own oscilloscope then check out these links
using sound card


want faster one then check out this
using parallel port

refer pictures

INFRARED SWITCH

Hello friends !
I have finally managed long range wireless remote with a range of about 15 meters ! Infra-red switch/proximity detector/obstacle detector/remote e.t.c.

CIRCUIT DISCRIPTION
Transmitter:
I have used two ic 555 both in astable mode, one is used to produce a carrier of approximately 38 KHz nearly 50% duty cycle and the second another is used to produce data signal nearly 20 Hz alternate 1 and 0
Nearly 50 % duty cycle. The output of the data signal generator is connected to the reset pin of the carrier ic producing 38 KHz carrier to produce small bursts at the rate of 20 Hz.
Receiver:
Receiver is the most important part of this chain, I have used TSOP1738 (very sensitive) as the detector, read the datasheet before using it, the TSOP1738 is immune to unmodulated carrier 38khz infra-red, hence the 20 Hz data signal is used to modulate the carrier.The output of the TSOP1738 is given to a missing pulse detector which is basically IC 555 in monostable mode having time constant 1.1RC greater than 1/20 sec
Schematics and pictures are shown below

PARALLEL PORT INTERFACING

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Hello visitor !

This is my first PC interfacing project via parallel port, I have interfaced my RC car via parallel port .Although in this case I have managed readymade code for it ,you can also write your own in C language, it’s quite easy you have to use inport and outport instructions ,search on net for it.

You can control 8 bits at a time; here is the URL from where I got the code

Instead of the transistors used as shown in the site I have used ULN2003/ULN2803 as they prove cheap and easy to solder .Go through the data sheet of the above mentioned IC’s before soldering them .So what are you waiting for ?