
Central Security System with pic16f877
Circuit Operation: PIC16F877 used in the circuit of the B and D as input port is selected. 8 of these units with port B doors, windows and etc.. from places logic 1 or 0 state is evaluated. D port... Electronics Projects, Central Security System with pic16f877 "microchip projects, microcontroller projects, pic16f877 projects, " Date 2019/08/02
Circuit Operation: PIC16F877 used in the circuit of the B and D as input port is selected. 8 of these units with port B doors, windows and etc.. from places logic 1 or 0 state is evaluated. D port is necessary for system operation or stopping the input of a predetermined password has been supplied. A and C are chosen as output port with port status LEDs and alarm circuit has been. C port to the B port is where you get the warning from the 7 segment LED display is used as the indicator showing. Instead of port 1 LED alarm circuit 1 or 0 is used to determine whether, enter the password warning LED LED 2, 3 the password is correct, and that LED LED LED yandıkd 4 seconds after the system is activated. 4 LED lights up when the system stops enter the password.
Security System Schematic PCB
Central Security System with pic16f877 pic assembly source code
FILE DOWNLOAD LINK LIST (in TXT format): LINKS-4031.zip
27C128 Frequency Generators
The originality of this description is that the generation of tones BF is made using a DDS . And this not by using a special build , but easy to find in the drawer bottoms circuit components .
The main features of this assembly are :
– Generation 2 frequency 800 Hz or 400 + 1000 + 2600 Hz ( by moving a jumper)
– Generation of a single frequency of 1000 Hz
– Adjustable output level of a min level . 100 mV dc 600 Ohm 35.4 mV rms . in single frequency or 25.0 mV rms . 2 tones