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A friend asked me to help her solve a problem with noisy neighbors above her apartment..
n our country, similar things can be solved in court, but without evidence...
On the technical side of things, I would need a microphone that would be able to record vibrations spreading through the body of...
Let me go back to the beginning, to the original question
Suppose a kettle with oil.
Sleepy state, heating off, room temperature 20 C
The output PID (controller output variable) should be directly the heating power in % (0-100).
Process variables, i.e. data from the temperature sensor in degrees...
Yes. the setpoint is always in the liquid phase region.
It seems to me that the most ecological way of obtaining data is cutting the time in which the heat is consumed for the phase change.
I tried to get a more accurate idea of the situation based on a fairly primitive mathematical model and ran into a new problem (a problem that I didn't come across originally)
As we have already said, the heating has 400W ie, 400W/s ie 400J
to heat by 1K, I need 3500 to 7000J depending on how...
OK
I can do that in principle
HOWEVER, within the basic time frame, i.e. 1 second, I can't (don't want to) control the heating power other than On Off-
The original idea was. every second I will measure the temperature, count the PID with a possible result of 1 or 0 for the next second...
I haven't reached a steady state, but a maximum safe state.
My reactor, which I heat with oversized heating.
The user adjustable temperature will be 100C with a five percent margin
a typical technologically used range of 65 to 95
120C is the range at which the thermal protection switches off.
I...
I would like to use PID to control the heating of the liquid.
I have about 3kg of liquid, a 16-bit temperature sensor and a 400W electric heater
I want to use the CMSIS PID from the DPS library as an algorithm.
For tuning, I should be fine with the Ziegler-Nichols method.
Maybe I'm stubborn...
I need to measure the temperature with a resolution better than 0.1C, an absolute accuracy of 0.5C, and at a rate better than 5Hz. Sensor in a small max three-pin case, will be connected with a cable of approx. 30 cm. Measured temperature range from room temperature to 95C, it is mainly a range...
OK, I'll clarify
The logic of usable pins on the control board side (including I2C) is +3.3V
Relay
3x 40A SSR +3 to 30V max 30mA
4x mechanical industrial relay pro AC and DC 5V or 12V or 24V, a typical relay coil of this category has power 500mW
1x reserve
It has not yet been decided what...
Thanks for the idea, unfortunately it's not for the MCU, but for the ARM Allwinner H6 with Linux. A professional board with a very limited number of usable IOs. For me, using a serial shift register means sacrificing at least two more pins and most importantly writing a driver for Linux. The I2C...
I am thinking about how to easily and cheaply control 8 relays (5 or 12 or 24 V) via I2C.
My first choice, I2C port expander PCF8574 and some transistor array. Unfortunately the PFC8574 has a Hi output after reset and NPN darlingtor or N Mosfet array switch relay on during system boot.
Can...
Does anyone offer a common pressure sensor that can measure pressures between 10 and 2000 Pa?
I have a mechanical pressure indicator on the vacuum chamber, spells from the vacuum, but I work when pushing below 1000Pa, it is poorly read, not to mention the theoretical maximum of the vacuum pump...
Thank you all for the responses, I will quickly respond to only the first post.
Use of pans, hotplates, irons, etc.
Not that I haven't thought of it, but
-Look at the links for the presses, they are not toys, but robust machines, because the pressing forces are from 130kg/cm2
-For an idea...
I need something like this or this.
I have a press, so I really only need heating plates.
Rubber vulcanization at 200 C.
Board size 200x200x20mm Aluminiu. Power 400W.
Voltage ideally directly at 230V.
My thoughts
Heating resistance R=U^2/P 230^2/400 = 132 Ohm
132 ohm is quite a lot for...
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