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    A constant current source simulation using transistor: problem in Proteus

    Here, in the picture attached, I've simulated a constant current source using an NPN transistor, TIP series. My task is to vary the R2 resistor and measuring the current change. This picture holds the info for a certain value, R2=50k. But the current, Ic is still constant. even at that value...
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    custom-circle-copper fill in ares-proteus

    ustom circle copper fill in ares-proteus I need to copper fill the portion in between the two circles. I've tried zone select mode, but it doesn't work efficiently as I need. Is there any option to do it?
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    Recording low frequency heartbeat sound

    Thanks for sharing the thread. Can anyone share a specific frequency-microphone? Or such setup. I need to proceed in a effective way...
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    Recording low frequency heartbeat sound

    I'm struggling with recording heartbeat sound of 20-180 Hz. I've tried several android apps to record with stethoscope integrated with condenser microphone. But it records low sounds from far away, but not heartbeat. So, what can I do now? Would I try to make an audio amplifier to amplify it...
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    how to interface IR sensor (Tx-Rx pair) with PIC16F877A or 16F88?

    // char data1='x'; //char data2='a'; //char data3='1'; int kp=0; char keypadPort at PORTD; char key[]="abcdefghijklmno"; void main() { Keypad_Init(); trisb=0b00000111; portb=0; // Initialize Keypad UART1_Init(1200)...
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    how to interface IR sensor (Tx-Rx pair) with PIC16F877A or 16F88?

    If you use universal remote,you should know each button's pulse code. You can find in using manchester coding. There is another way,you can use UART protocol for uC to uC communication. Use Transmitter IR on Tx of remote uC.Send a character,say 'x' by UART_write function. Set IR receiver on...
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    how to interface IR sensor (Tx-Rx pair) with PIC16F877A or 16F88?

    You can do it by several ways.How many switch do you need to control? And what kind of remote,the universal one or something self-made? Analyzing these things you should choice your protocol. Like UART or just switching it through logic. At first,try yourself. If failed,then post the code or...
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    UART communication with virtual terminal PIC 16F877A

    I've done UART communication,with virtual serial port driver. Hope it would be helpful to you the newbeez to microcontroller. Here is the sample code in Mikro c and simulated in ISIS. :)
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    Active bandpass filter for an audio amplifier heartbeat monitoring device

    Yes. heartbeat axis actually shows equivalent voltage of heartbeat. Yes,it is an audio signal,I pulled it down with a 100 k resistor before sampling to thr Uc so that it shows zero level while there is no sound. - - - Updated - - - I specified bandpass freq,but there was no option for roll of...
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    Active bandpass filter for an audio amplifier heartbeat monitoring device

    The software suggested me 12th order,nothing else. The waveform is plotted realtime on C#. Uc sends data after every 20ms.Baud rate is 9600. I am also confused is it reasonable or not...
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    Active bandpass filter for an audio amplifier heartbeat monitoring device

    Hi everyone, I am working with my project of developing a heartbeat monitoring device. I've built a circuit that gives me output quite well, but there is noise. FIltering it out I wanna design a bandpass filter of range about 60-600 Hz. I've tried in Filterpro designing software, it gave me...
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    [SOLVED] External Interrupt on PIC 18f4550

    I've just solved the problem. :) Problem was,I had't made the analog B port digital. Thank you vary much sir :) - - - Updated - - - I've just solved the problem. :) Problem was,I had't made the analog B port digital. Thank you vary much sir :) - - - Updated - - - I've just solved the...
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    [SOLVED] External Interrupt on PIC 18f4550

    TRISD=0xFF; // Configure PortD as output port For output it should be TRISD=0; I'm tried using Mikro C 4.15 and 6.00 But still no output.... :( - - - Updated - - - TRISD=0xFF; // Configure PortD as output port For output it should be TRISD=0; I'm tried using Mikro C 4.15 and 6.00 But still no...
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    [SOLVED] External Interrupt on PIC 18f4550

    This is my modified code.But still there is no output..... :( void main() { TRISD=0; // Configure PortD as output port portd=0; // INTCON=0x10; // Enable INT0 INTCON=0b10010000; // INTCON2=0; // Set Falling Edge Trigger...
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    [SOLVED] External Interrupt on PIC 18f4550

    Thanks for reply :) Sir,isn't it necessary to select the initial state of PORTB ? I just want to make state "HIGH" of PORTC by external interrupt on RB0. My logic was,when PORTB=1,interrupt will occur confirming INT0IE && INT0IF=1. I'm little confused when I press PORTB.f0,does it automatically...
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    [SOLVED] External Interrupt on PIC 18f4550

    Hi, facing problem to do an external interrupt on 18f4550 uc. Got a lot pain...Trying various way,but nothing happens... void Interrupt() { // This is external INT0 interrupt (for sync start) // - once we get falling edge on RB0 we are disabling INT0 interrupt if (INT0IF_bit &&...
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    increasing infra red range for uart communication

    Thanks Rainer nd Frank. IR emitter/receiver(2 pin) Datasheet that we find in net is common one to all.Can you suggest me datasheet of any specific IR of my required current rating? I'm facing problem with TSOP as it receives only specific frequency's pulse(38 kHz).I don't know at all pulse of...
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    increasing infra red range for uart communication

    Hello, my project is to communicate with microcontroller by uart protocol through ir.I succeed in it quite nicely.But the distance is very small,like 6 inches. So how can I increase the distance.I am using 16f73 for remot (tx) & 16f877a for Rx.I am also confused about selecting perfect boud...
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    face detection using matlab

    Hello everyone, i m using matlab to learning face detection and object tracking. please suggest me tutorial and sample code for it. how can i start from the basic? Oh,i m using built-in webcam of my laptop... thanx in advance....
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    Resources about using timer interrupt in PIC uCs.

    Thanx to all....... :)

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