Sensor Interface Circuit / Cellphone Detector, Vibration and Pressure Sensor
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- Опубліковано 21 лип 2024
- If you want to build your own custom sensor you will need an interface to your micro-controller or logic circuit. This video will describe how to build a simple Sensor Interface circuit that will generate logic output signals from your sensor.
- Наука та технологія
Excellent, thanks for providing your tips and ideas, keep those circuit videos coming!
OMG, blown away, NICE !
Thank you very much. I like seeing what you have done here.
Another brilliant idea filled video. Thanks.
Love your circuit videos....
t04-11-2023
(1.) Hi, there.
(2.) Very new to electronics and need some clarification for the vibration detector.
(3.) For the vibration detection portion of your presentation, would you:
(3a.) detail the components used (including the value, voltage, percentage, wattage, etc.)
(3b.) list the pin-out for the locations you’re using in the circuit
{ for instance, the LED (voltage unknown) looks to be situated at E15, F15; the 4.7uF .1J100 capacitor appears to take up B10, B13 }
(4.) Difficult for a newbie to know where to place the specific resistors (you had called them voltage dividers) and green component (what I think is a .022 uF capacitor, yet percentage and voltage aren’t defined) from looking at the schematic so that everything’s correct.
(5.) Saw in an earlier come that either 10 volts or a 9v battery could be used for the power supply, so I’ve got that one solved.
(6.) Thanks.
(7.) Toodles!
as always it was useful
Why connecting the diode in the dipole antenna in parallel not in series ?
What's its purpose ?
Can it work without the diode at all ?
I've never seen an op amp comparator circuit where the voltage divider is fed into both inputs, usually it is fed into a single input that serves as the reference. Are there particular advantages to your design?
It makes the circuit very sensitive and will trigger on very low input signals.
good stuff man
Thanks for the feedback...
Excellent, thanks
You're welcome!
@2:54 Does the 82k resistor cause a difference in input voltage to the op amp or is there no current flowing thru that resistor because of the high input Z of the opamp so that the voltage on either side of the resistor is the same ?
The voltage on either side of the resistor is the same. The 4.7uf capacitor acts as an AC short so the resistor isolates the input signal from being shorted to ground.
Brilliant
Hi there 0033mer,
Question about substitution of capacitors… I know how to easily substitute resistors in a circuit when I don’t have a particular resistor on-hand. But can we do the same for capacitors? For example if a circuit calls for a 0.068 uF and all I have is 0.1 uF caps ?
Before doing a capacitor substitution you must understand the application the capacitor is used in.
For timing application like a 555 timer you need to use the same value or the frequency will change. Input and output capacitors in an audio amp circuit determine the frequency response. Power supply filtering caps can be higher in value but use the same or higher voltage rating. The type of capacitor also has to be taken into consideration.
Electrolytic and Tantalum are polarized, Ceramic and Film are the most common and Mica are used in RF circuits.
Check out this video for more info: ua-cam.com/video/J0TjW_0xTJU/v-deo.html
@@0033mer thank you for the summary, I couldn’t find this info so well put!
Thanks
Can you please explain how the 4.7uF capacitor filters the imput signal ?
A capacitor is basically a short circuit to an AC signal.
Any input signal (AC) that gets to pin 2 of the opamp will be shunted to ground.
What is the voltage used at VCC? And the antistatic foam we are using is giving us between 1000 k to 300k... I used different types of antistatic foams still same result
The circuit is powered on the bench with 10 volts DC but can also be powered by a 9 volt battery as used in this video: ua-cam.com/video/2_aGQjPzySs/v-deo.html
The change in foam resistance is what will trigger the circuit.
Hi 0033mer, can u explain what you mean by the reference to the stray 60 Hz ?
The human body acts as an antenna that picks up stray 60Hz radiated from the power lines in your house. You can see this when you touch the tip of an oscilloscope probe. This 60Hz signal triggers the sensor interface and turns on the LED when touched.
This is very interesting circuit. Than you for this video! Unfortunately I don't quit understand everything in the design. I don't understand all values for the resistors and why it is used combination of 82K resistor with 4.7uF capacitor to block AC signal. I would like to learn more details about circuit and how to project it, calculate values etc... How can I learn this?
Check out the book Practical Electronics for Inventors. It is a very good reference book for electronics circuit design. You can download it free here: www.pdfdrive.com/practical-electronics-for-inventors-4th-edition-e158038931.html
@@0033mer Thank you so much!
these ca3140 can sense very small current/voltage change...and are better than normal opamps
it still works with normal op amps its not a big deal ..
ive tested your engine spark plug sensor and i read the frequency signal output with Arduino, and unfortunately the outputs signal stop when i put 130hz signal with sine wave, did my circuit wrong? or this circuit has a limit 130hz?
~thankyou
The circuit was designed to give a visual output indication using a LED and not for high frequency detection. The output signal from the OpAmp is integrated by the RC components and diode connected to the gate of the Mosfet. If you remove them and monitor the output of the OpAmp directly you will increase the frequency detection output.
@@0033mer thank you this really helps me sir. So does it means if your spark plug sensor circuit handles 130hz max when the engine rev very high it limits blinking around 7000rpm? and what are the compoments should i remove to see more hz while maintaining the use of the spark detection from spark plug?
~thankyou
Damn son!
I saw this while it still had that "new video" smell!
Can we know the components list used
Check out the schematic at 2:53