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What i am making here is a USB lock with smartcard key. The idea is that a phonecard reader made with a PIC micro will be able to store a number of different phonecards into memory. Whenever one of these cards is inserted into the slot, it will activate a 4-ports USB On/Off switch. If the card is removed, the USB ports will be de-activated. [ ]

I designed it with following WinPIC-800 (V3.64) Hardware (PG3b) PC Parallel Port 12-20V/DC Power Supply In this programmer i modify the (PG3b) with my own techniques,First i modify the Parallel port cable that's one side is DB-25 (Male) connector and other side is DB-9 (Female) connector and this DB-9 (Female) Connector is plugin in DB-9 (Male) connector which is on the Programmer Board.This process that i do just only for the reducing the extra space of Programmer Board and make it much more efficient in working mode.All pictures and Fully operationally Working Video are attached. To get COMPLEATE PROJECT in working and tested condition feel free to contact with me just click on "About" link NOTE: ALL OF DATA OR METERIAL ON THIS BLOG IS JUST ONLY FOR STUDYING OR LEARNING PURPOSE ONLY

Today I'll introduce you how to make a simple digital watch with LCD 16x2 and PIC 16F877a. It's very easy to implement this clock and you can make this as a gift clocks for kids. I'll also provide you the source code of the clock so you can easily customize to make your own countdown clock, count up timer or something that more useful than an analog clock. OK. Below is the circuit diagram of the digital watch. Online Digital Clock Circuit Diagram SOURCE CODE: Tags:  digital clock online,  555 timer,  count up timer,  a timer,  555 timer projects,  digital wall clock,  Note : If you have any problem with running this code, feel free to comment below. This project has 2 file as described below. Copy it to your workspace, compile and run. File: LCD4bit.h #define lcd_RS PIN_D1 #define lcd_RW PIN_D2 #define lcd_E PIN_D3 #define lcd_B1 PIN_D4 #define lcd_B2 PIN_D5 #define lcd_B3 PIN_D6 #define lcd_B4 PIN_D7 #define dong_1 0x80 #define dong_2 0...

This simple circuit can be used to program the PIC16F84 and similar "flash memory" type parts. It uses a cheap 555 timer IC to generate the programming voltage from a +5V rail, allowing the circuit to be powered from a computer’s USB port. The 555 timer (IC1) is configured as a free-running oscillator, with a frequency of about 6.5kHz. The output of the timer drives four 100nF capacitors and 1N4148 diodes wir-ed in a Cockroft-Walton voltage multiplier configuration. USB-Powered PIC Programmer Circuit Diagram The output of the multiplier is switched through to the MCLR/Vpp pin of the PIC during programming via a 4N28 optocoupler. Diodes ZD1 and D5 between the MCLR/Vpp pin and ground clamp the output of the multiplier to about 13.6V, ensuring that the maximum input voltage (Vihh) of the PIC is not exceeded. A 100kΩ resistor pulls the pin down to a valid logic low level (Vil) when the optocoupler is not conducting. The circuit is compatible with the popular "JDM" progr...

Now you'll be able to perpetually grasp the precise time. With this style you'll be able to have an atomic clock in your area. Isn’t that great? scan on to grasp additional. First of all, it's not regarding any radioactive components here. this can be regarding building a clock show that may get the time from the DCFF77 facilities in Frankfurt, Germany.All that's required may be a clock LED show, DCFF77 receiver, and a microcontroller at the side of the mandatory connections. Basically, the project permits a sign that's sent by the DCFF77 radio station to be decoded. After that. the microcontroller method it and sends it to the LED show to indicate the precise time. there's no got to build a sign receiver, an honest quality receiver may be bought on the net for a coffee worth. Once everything has been set within the affiliation board the PIC supply code ought to be developed. The orientation of the antenna ought to be perpendicular to Frankfurt. it'll receiv...