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Liquid Filler on PCB

In the last two articles we have worked on the breadboard.
We have seen that the circuit worked well so we need to construct it in PCB and then calibrate it.
We will start with the KiCad schematic file and then we will see the PCB layout.
Then we will construct a weight board with the load cell installed on it.
Once done with this step then we should be able to calibrate the device.
The calibration will be discussed in a next article.

...continue reading "Liquid Filling Machine – Liquid Filler Part 3"

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Published on 1 Comment on Liquid Filling Machine – Liquid Filler Part 2
Liquid Filler On Breadboard Part2

In the first part of liquid filler we have made the user interface.
LCD buttons and circular menu were made.
Now it is time to add the relay and the weight sensor.
We will keep working on our breadboard.
In this article we will see how to connect the relay then our load cell amplified by the INA125 and lastly the modified code from the last time.

It is highly recommended to read the relay article and the weight sensors introduction before you start.

...continue reading "Liquid Filling Machine – Liquid Filler Part 2"

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Liquid Filler at 20Kg

Liquid filler will be our first complete project here at hw2sw! 😎
We have made a series of articles that we will use in order to reach our goal.
Liquid filler is exactly as its name says, an really cheap but accurate liquid  filling machine.
We need to auto-fill bottles with a certain capacity (50 up to 8500gr).
This arduino based project will permit to fill all containers with a certain, user defined, weight limit.
So the machine works on weight base and not on volume, flow or pressure base like other fillers.
Other than the  machine you see in the photo, you need a weighting board that the bottle will sit on and a gravity feed valve that is piloted by liquid filler.
The present solution will weight containers up to 8,5 Kg.

...continue reading "Liquid Filling Machine – Liquid Filler Part 1"

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Published on 2 Comments on Weight sensors and arduino
Analog to digital converter

A sensor is usually an analog device. Analog devices are connected at the analog ports of arduino.
Arduino  with the use of AnalogRead function can read the analog sensor value from the specified analog pin.
The Arduino board contains a 6 channel 10-bit analog to digital converter. A 10 bit analog to digital converter as we have seen in the "Binary Decimal and Hexadecimal numeral systems" equals to a 210 – 1 = 102410  (0-1023 => 1024 steps).
If the resolution of arduino (1024 steps) does not cover your project you should use an external ADC converter with more that 10 bits.
For example you can connect the LTC2400 ADC which happens to be a 24 bit analog to digital converter.

...continue reading "Weight sensors and arduino"

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Relay 5V

In this article we will talk about relays.
The relay is a device that permits with a small voltage to pilot a reed switch.
How this device should be applied on the circuit ?
How can we place it on an arduino ?
All these answers will be cleared in a while.
Let's start with some theory to see what happens in detail.
At the top of the relay we can see the 5V as input pilot voltage.
And we can see the 10A limitation at the 250VAC of the reed switch.
So with a 5 Voltage we can "switch" a 250VAC device that can consume up to 10A (P=V*I=2,5KW).
If you need to pilot a device that consumes more you should use a "bigger" relay that fit at your needs.

...continue reading "Relay and arduino"

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