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liquid level measurement
Dear FvM,
I'm so sorry for my posted comments.
I've just tested PD in zero-bias mode using a voltmeter. The result is: -280mV at cathode vs. anode in sunlight.
I wish you accept my apology.
Thanhlongbin
pic liquid level infrared
I'm a graduated physics. PD operation is base knowledge in the semi-conduction course. My 20 years experience in practics electronics give me some thing to do with OPAM. :D
No. It's not fine!. Only with reversed bias for Si-PD about 5V PD can generate...
external liquid level detection
I want to believe so much! But Google book says:
"When Photodiode (PN or PIN) used in zero bias or photovoltaic mode, the flow of photocurrent out of the device is restricted and a voltage builds up. The diode becomes forward biased and "dark current" begins to...
led resistance formula
There's a typing mistake:
I = 3.6/470 = .007A (or 7mA) ! :D
LED is not a linear device and its resistance is a function of voltage applied to its pins.
Similar to any diode, LED is a diode too, in forward current, LED has a drop voltage about 1.4-1.6V. This drop voltage...
infrared red level sensor
No, FvM
The mentionned PD-OPAM connection is fine if OPAM is supplied by 2 voltage : positive and negative relative to GND level.
But in this design, OPAM has single supply only. (12VDC and GND).
More detail:
Say
-Ip: Input photocurrent ;
- U+,U- : Input voltage...
water level controller contactless sensors
Not yet! The receiver module TSOP1838 is designed for PCM communication.
You have to put an additional Modulating signal to Control Port (CTRL) in the transmitter side. Download the receiver data sheet to get modulating signal format.
In receiver...
infrared liquid level sensors
I'm fraid that in the top posted Author design, any low photocurrent generated by PD forces OPAM-amplifier saturated with output voltage always 0V (Gnd). Interchanging PD Anode /Cathode connections may fix this mistake.
For simple intensity detection...
does voltage and ampere has to be same
A voltage source does not have a constant resistance.
Rating current of voltage source is a supply current value when the output voltage reduses in some percentage, normally say 10%.
For a consumption product, resistance is function of supply voltage...
liquid level detection laser reflexion
That's right.
We are discussing a theoretical model only.
However, it's useful for the topic author to clearify his problem specification.
Added after 26 minutes:
Your teacher's quite right! :D
This design has some weakness, for example the IR...
infrared water level sensor
-Let's take a look to reflection from the tank bottom which is made from 100% reflective material (ideal mirror!) and placed at distance >10cm from air/liquid surface.
Google says that water absorption is about 10dB/cm @IR wavelength 800-1100nm (typical for cheapest...
schematic of the simple square wave oscillator
For beginner only!
Please open the picture.
Look at U1A,R1,R4,R5 and C1.
R1=10K; R4=1K.
C1=100nF;R5=10K.
First Question (or puzzle):
Estimate the period (or frequency) of this RC Oscillator.
level detector schematics
I propose a phys. model so:
Almost of comercial IR LED produce IR beam with beam divergence about 10-20 degree. Ignoring all the IR absortions in short distance, IR intensity can be shown as a simple function of the distance.
Let say: L= optial travel path length...
ac fluid level sensor
I hope with 20% accuracy (50cm+/-10cm) it can work!
I would say:
The original circuit has been intended for target detection with solid surfaces and low distances.
It remembers me the vehicle counter in the gateway.
best way to measure the liquid level
Dear FvM,
As I now, for such application with liquid level, there're some classical methods like: pressure measurement, resistive or capacitive detection,..All of them require a mechanical and/or electrical "contact". So another methods which is based on...
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