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Hi everyone,
Can anyone guide me how to increase delay time of this sensor.
I want to turn on signal for 15 mints after detecting motion.
There are 2 ic's on this board
1 LM339
2 LM358
Here are images.
Problem is solved in only one way com
here is master code
/* Standard Include for 16F877 Chip */
#include <18F4550.h>
#fuses MCLR,hs,NOWDT,NOPROTECT,NOLVP,PUT
#use delay (clock=20000000)
#use rs232(baud=9600, xmit=PIN_c6,rcv=PIN_c7,)
#use I2C(MASTER, sda=PIN_B0, scl=PIN_B1,fast)...
Hi .
i want to design fingerprint based attendance system using
i just want to know how many users can register in this sensor .
her is the link of this sensor
https://www.sparkfun.com/products/11792
thanks treez and thanks ander for your reply .
https://www.ccsinfo.com/forum/viewtopic.php?p=28651
i have tried these codes
MASTER
/* Standard Include for 16F877 Chip */
#include <16F877.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP,PUT
/* Delay for 4 mhz crystal */
#use delay (clock=4000000)
/*...
hi.
i need an example to communicate between 8 pics as slave and one as master.
Every slave have an led light and i want to make turn on or off from MASTER instruction.
i want to use pic16f877a microcontroller for all (master and slaves).
I have little bit practice on CCS compiler if any body...
Well i have an assignment to make inverter using ZVS topology.
i have made it before using this design.
pic microcontroller will generate oscillations .
ir2110 driver will be used for mosfet driver and that's all.
i have made it before without zero voltage switching .
I have read a lot of...
i have made volt meter using this method .
1. find out Vmax of sine wave by taking 500 samples .
2. V=Vmax * 0.707
it works on sine wave but
when i try to measure ac dimmer output or square wave of ups then it fails.
Thanks for your guidance.
I just want to make copy of digital VOLT meter suppose this one .
what ever this meter shows against pwm, AC dimmer output , sine , square , saw tooth, my meter should be equal.
what should i follow
RMS OR AVERAGE OR SOMETHING ELSE ?
You can choos another meter as well
what does digital voltmeter measure when we apply any kind of voltage at its input.
Suppose we apply sine wave .
does he measure rms value .
if rms then how .
When we apply random wave like triac based dimmer output then what do they measure.
When we apply square wave at its input then...
I have analysed the problem and found the reason of annoying behave .
Spark is generated on relay points When 220 loads are connected and relays turns on .
Spark generate noise in data lines of 74hc595 so it laugh on me :laugh: .
i have tried to send same data 5 times and it is working with...
Hi Everyone.
i am facing a high noise problem in a relay flasher circuit.
here is circuit diagram and pcb image of shift register pcb for relay
Main code
#include <18f452.h>
#device ADC=10
#FUSES HS,NOWDT, NOBROWNOUT, NOLVP
#use delay(crystal=4000000)
#use...
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