filtered water with Arduino

Description

In the house you use drink filtered water. In fact it is found that sometimes cleaning the filter cartridge demonstrates a muddy patina and for this reason there is the preference to filter drinking water.

Last year it presented the problem that the flow-through to the filter is so slow that for a liter of water you had to wait more than a quarter of an hour. With the consequence that sometimes we absented ourselves forgetting the filter open, so that sometimes he made his mark of flooding in the kitchen.

The filter consists of a ceramic cartridge of a certain porosity. The duration is such that as long as the water passes through. For this more would filter it becomes clogged and well.

For this, I chose to add a pump that would speed the delivery. Also I chose one that would raise the pressure to at least 0,7 Mpa (7 bar) with a flow rate of 4 liters / minute. I did well I found one that works 12 V so I can use an old power supply of a laptop (14 V 42 Watt).
Now with the new system the bottle is filled in a quarter of a minute. An improvement of more than sixty times .

Project

The project fto a little more than necessary, because it might be enough of a button and start the 'delivery. So much for fun and comfort control it has the peculiarity to keep a count so that inform you when the delivery has reached a certain volume exempt.

At the beginning I thought I would put everything inside a container, I did not leave too many water and electricity connection to the fact fray, I have taken the CAD and I studying how to arrange the components.
What the published CAD has not mounted control, since there have been several revisions, after the study of the spatial component implementation.
In the end I had to make a little deal with the size of the container, I was hoping to be able to settle in a cheaper one.

the scheme

It was designed to be able to eliminate disturbances that the motor and the 'solenoid valve cause. In fact, the display is prone to drift and the characters appear busted. This is why I adopted transil, MOV, snubbers and even the’ update the display.

The display that I have used is a 8×2 blu. Hath predicted that can be programmed for the control of the backlighting, but blue is not feasible. As hardware can implement PWM, but there is not provided the input for the photoresistor. As with my display I opted not to control PWM.

As hardware you can also opt for some other type of control, one part is provided as an operator interface via knob with encoder and display, on the one hand it allows the communication via the serial and an expected part to control two outputs. One of which can operate in the amplitude modulation.

There is a bridge that allows to separate the power supply from the rest of the circuit arduino. It is expected to be able to program Arduino without moving from the seat and without strange effects of power outside of Arduino.

Green dots are connectors FASTON type, so as to be able to intervene quickly to remove circuit.

To mount the display I preferred to use the tulip connectors and solder pin in the position of connections. With this method it will be possible to perform precisely remove changes in its area below, or replace the display.
You may notice a white LED that is placed on the transparent front panel that is in front of the display. When the display is turned off you are always known an illuminated border around the display and makes a nice.

Lthe same materials

The software

Education firmware use

Premise:

The program source is commented plenty per to help understand what is written, and maybe, in a subsequent period usally the MAINTENANCEne.

Nell'ultima version I had to adjust a lot and also added an online help to remember the available operations.

The display messages are in English, why the family does not know my language. Remains communication via serial which is in Italian. It is, however possible to exclude the compilation with the use of the serial.

It should be noted at the beginning definitions that determine a compilation in a differentiated way of hardware utilization.

The options are:

How to Use

First method commandsl device.

A single entrance is governed by a rotary encoder. Preliminary tasks are three:

• Turn the knob, It involves move to the selection of a delivery program

• Long press, allows d 'start dispensing until such time as holding down

• A double click, ago switch the use of the pump.

Here there are high options, after making the first command. In fact they have the 10 dispensing programmings. It was planned to limit 10 liter maximum. It places the value in ounces. However, you can change to a maximum of 255 decilitri.

When you see a program, you can access the tag with a double click. Or long press to exit and return to the main menu.

There is also the 'option eleventh, that allows you to enter setup / information phases. Also through a double click is implemented to enter the menu. The explanation of the comments perhaps make better idea of ​​how it works.

I did not see the need to a measure of 25 l, so usually it fills a bottle to put in the fridge to cool, the most of someone else's family member fills the pan to boil water. Anyhow 4 liters is the commonly accessible limit.

In phase SETTINGS, There are five options. Zero the two filter alarms, modify the pulses per liter of the flow sensor, change the threat level (provided that the option has been compiled), finally reset the counter of goodwill.

second method Serial Commands.

It has been predicted communication with the arduino via serial. This can be a USB-RS232 adapter is compatible with voltage levels of micro. You can also use a Bluetooth module, who may need a focus on the voltage levels of the micro. I put a voltage divider to adapt to 3,3 Volt leg RX Bluetooth module. The TX pin does not create severe problems.

List Commands from serial

The control model is based on an initial letter followed by numbers, if it is necessary. The first letter does not matter whether upper or lower case.

Commands in detail from the serial:

End Command Message:

At the end of each command is an information message. Reading the source are unable to understand what they are and how they present themselves.

NOTE

There may be some oversights or improvements to be made and I would like to know how to do better.

Use the project involves responsibility, that the 'author assumes to cause damage to persons or property.

The package to download if you're interested.