Hi everyone. Thank you for viewing.
I have some problems with my pressure circuit. I am using a Force Sensing Resistor that act as a basic resistor. When there is pressure, the resistance will drop. It is somewhat like a LDR.
https://www.sparkfun.com/products/9376
The 1M ohm pot is supposed to be a dummy that act as the sensor. In simulation when both POT at max, the buzzer is not working. After i reduced the resistance of the 1M ohm pot, then only there is output. Overall, the expected result is obtained (in simulation).
But when i try it on a breadboard, the output is approx to 8V at all time, regardless of the variation of pot. So, i wonder how can this problem occur when it does not in simulation. Is it the 555 or the transistor? or the overall circuit?
This is the actual circuit that i refer to create my version
http://electroschematics.com/6122/pressure-sensor-alarm/
Please help me. I would really appreciate it. Thank you.
I have some problems with my pressure circuit. I am using a Force Sensing Resistor that act as a basic resistor. When there is pressure, the resistance will drop. It is somewhat like a LDR.
https://www.sparkfun.com/products/9376
The 1M ohm pot is supposed to be a dummy that act as the sensor. In simulation when both POT at max, the buzzer is not working. After i reduced the resistance of the 1M ohm pot, then only there is output. Overall, the expected result is obtained (in simulation).
But when i try it on a breadboard, the output is approx to 8V at all time, regardless of the variation of pot. So, i wonder how can this problem occur when it does not in simulation. Is it the 555 or the transistor? or the overall circuit?
This is the actual circuit that i refer to create my version
http://electroschematics.com/6122/pressure-sensor-alarm/
Please help me. I would really appreciate it. Thank you.