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Basic PIC18F4550 USB Communication Interface
Posted on Tuesday, April 27, 2010   •   Category: PIC


When the device is connected to the computer, a Virtual COM Port (VCP) will be created. This is shown at the Device Manager Window under Ports(COM & LPT). In this case, COM5 was created when the PIC18F4550 was attached to the USB Port. It may be interesting to note that if you plug in your PIC in different USB ports, the VCP created will be different.


AVR ATMega8 PLL Module with MC145170
Posted on Tuesday, April 27, 2010   •   Category: AVR


This is the transmitter PLL module with ATMega8, MC145170 and 16x4 LCD Display.


Basic USB-RS232 Communication with PIC Microcontrollers
Posted on Tuesday, April 27, 2010   •   Category: PIC


The quickest way to display something is probably sending the data to the computer to be displayed on the monitor. One of the ways to do this is to use the USART module on board the PIC Microcontroller by making use of the pins RC6 and RC7 which is also the TX and RX pins respectively when the SPEN bit on the RCSTA register is set.


MC145151 PLL FM Transmitter
Posted on Friday, April 23, 2010   •   Category: FM Transmitters


This PLL has been designed with an old Motorola circuit :the MC145151. The VCO is based on a "Colpitz" oscillator equiped with a Fet Transistor.(J310) Two varicap Diodes are used in order to reduce the global noise of the VCO. In addition,these two diodes allow the PLL to keep the lock status through a large range of climatic conditions. An another J310 is used in order to match the impedance between the oscillator and the fist amplifier stage. A MSA1105 from Minicircuits increases the RF power level coming from the VCO to +14dBm. A simple low pass filter rejects the second harmonic to -20 dB.(Worst case) Finally, a 7 dB attenuator and a second amplifier stage (BFR96S) achieve this radio design.


Infra/radio remote control transmitter/receiver with PIC
Posted on Friday, April 23, 2010   •   Category: Remote Control


The encoder/decoder parts are to be connected to a transmitter/receiver module which takes care of the transmission of digital signals by radio or infra waves. The communication signal format is designed to be used for radio transmission (it has a constant 50% signal/silence ratio), but it can work with infrared devices as well.


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