Recent content by akaliuseheal

It is in air. I have the capacitor connected to the multimeter set to measure capacitance. I have it conected and turned on for couple of minutes.

Hello, I have made a capacitive water level sensor. It is a parallel plate capacitor. While measuring the capacitance of my sensor, I measure 53 pF. I then leave it for couple of minutes, still conected to the meter, capacitance then rises to 54 pF. Capacitance is slowly increasing. Why is...

So, I have found that these types of capacitors are called coplanar capacitors. On last page of that paper it states that calculations provide reasonably accurate values in certain conditions. If someone googles this in the future, I have also found THIS

I have made the capacitor but I would like to know the calculation. I would like to be able to make a capacitor with specific capacitance based upon a calculation. Calculation does not need to be 100 percent precise. I measured the change of capacitance when there is water on only one side. On...

Summary: Two plates side by side, not parallel to each other. Hello everyone, Purpose of this capacitor is to detect changes in water level. It is constructed of a single copper plated pcb on which middle I have made a 1 mm of space separating now two copper plates on a single pcb. So, plates...

Sorry for the late reply, I haven't had a chance to test it since I was busy. If that is true, does that mean that I will need a larger capacitance. I have not used the same size copper plate as shown in the video, it is more like the size of that arduino sensor.

However, measured voltage does not, only when copper plate is directly exposed to water.

It had no air, I used a tape like one in image provided I see no reason to test it with distilled water since it won't be used with distilled water and I do not have it. Capacitance does change even when it is covered with tape or a bag. I don't have the numbers right now but that part of a...

Vaule of C when submerged and when it is in the air? If that is what you asked, what I measured is 120pF when in air and 4.5nF when fully submerged. I measured it with cheep multimeter and wires used for connecting were around 70pF. Voltage measured when in air is 4.66V (when touching it with...

They are, every ground including that "GND" is connected.

Hello everybody, I have made soil moisture sensor and it kinda works. It is a capacative sensor not resistive sensor based upon TLC555 which has a role to create square wave. Square wave is brought to a homemade capacitor. Capacitance changes with change of moisture. Output is measured voltage...

I figured out the correct values but I still don't see the point in this: That was to calculate resistance of a pull up resistor so that logic 1 has value of 5V. Why that step? When R = V / sink_current, where V = Vdd - voltage_wanted_on_the_output

Sorry to bother you, I was away for 3 days and I wanted to look over this thread again and I have also seen that you answered on that "reading datasheet" thread so thank you for that also. Now, going thru it again, what confuses me is when we recalculated values of R1 and R2. Are those the new...

Hello, I've got a voltage comparator, well only on schematics, I need to chose one and I need some help interpreting datasheet. The datasheet I was looking at is of a lm393. My input voltage ranges from -7.8V to +7.8V. The datasheet says -0.3 to something. So it's not usable, right? I was also...

Huge thanks to you, thank you for your time. Edited