how to integrate a smoke detector with PIC16F877A

[maxster03]

Hi there,

i want to ask you how can i connect a smoke detector who is giving me an output voltage of 2.20V to 2.50V (which is not constant) when it detect smoke and 0V when it doesn't detect smoke.

for the PIC16F877A, i need a constant voltage of either 0V or 5V

Can anyone help me with this problem, PLEASE !

 

[blueroomelectronics]

Use one of the comparator inputs.

 

[jackson0215]

I also having the same problem like you,if u already find out the solution,can u send the source code and teach me how to do it through email??

my address is jackson_gan_ipoh@hotmail.com

 

[AdvaRes]

Use a Pull up inverter. You'll require only a resistor connected to VDD + an npn or nmos transistor.