Friday, June 27, 2014

Real Time Activated Water Level Timer Controller Circuit

An automatic water level timer controller circuit which responds to a real time clock input is discussed in the following article. The design also includes a water detection stage which makes sure the initialization takes place only in the presence of water in the tank or the pipe. The idea was requested by Miss Soumya Mathur.

 The Request

Hi Swagatam Sir,
i m ur biggest fan. m in final yr of my b.e. in electronics & all i can say i will b soon engg. bcoz of u only. i make my each & every project form your guidance. i
passed by 3rd yr only because of u n ur project. u r biggest help of mine. without u n ur idea....m nothing. u teach ur each n every project in simplest possible manner.
each n every student on my batch n even our seniors take help from your ideas n site. u can imagine how famous u r in our college, that college has blocked your site in our
hostel premises LAN n wifi. dats y i access ur site from my cell n writing u mail on gmail.
m in final year n i need ur help in my project. if u don't help, i will FAIL in my project. ur Semi Automatic Water Level Controller/Timer Circuit
( is already made by one of our seniors. m planning to modify it a bit. PLEASE
HELP ME". m planning for something different which is as follows :
1. on/off timer : it should have on/off timer. it can be real time (i.e. like alarm in cell) or simply fixed time (i.e. like on timer in tv). similarly off timer also.
if possible it should give me facility to off my ckt after every 15min till 120 min after ckt is on.
2. water checking : suppose timer is set to 6:00am, den at 6:00am before ckt gets switch on, it should check whether water is available in tap or in tank. if yes, then
only it should switch on ckt, else not. similarly if ckt is set on for 60min (6:00am) n water goes off after 45min (6:45am), then immediately ckt should cut-off n
should switch off pump.
3. i want to run my home pump. i don't understand electrical much but its name plate is written 1.5kw 210V 15Amp.
if u need ny help from me, plz let me know, i wil help u in every possible manner
u can make n post this on ur site. al i expect is jst send me link to my personal gmail id, as i told u ur site is block in our college n hostel premises.
thanks a lot sir in advance
Soumya Mathur 

The Design

The circuit design of the proposed digital clock controlled, real time, automatic water timer/controller circuit may be understood with the help of the following points:

Referring to the diagram above, when a clock positive pulse is received at the input of C2, the circuit consisting of T1 and T2 is latched, allowing the positive 12V to reach the IC1 stage.

The above action powers up the IC1 stage which immediately gears up into a counting mode with an initial zero logic at its pin3.

However the IC1 is able to initiate only in the presence of water in the tank or in the pipe which is detected by T4 through its base sensing plate.

If the presence of water is detected, pin12 of the IC is enabled with a ground signal so that the IC is allowed to proceed with the counting process as expressed in the above discussion.

The triggering clock signal could be from a digital clock alarm output jack or any other similar source which is able to provide a real time based signalling as per the setting of the alarm in it.

Once IC 1 is initiated, it begins counting with the initial status of its pin3 at logic zero.

At this situation T1 is unable to conduct, which allows T2 to conduct triggering the connected relay.

The relay thus initiates by switching ON the motor which starts pumping water across the intended location.

As soon as the counting period of the IC lapses, pin3 goes high switching off T2, relay and the motor to a stand still.

The positive feed from pin3 also reaches pin11 of the IC and the base of T3 which together make sure that the IC gets completely disabled and switched OFF until the next pulse from the real time clock gadget or a cell phone is applied at the shown input of the circuit.

There's one situation that needs to be noted: If a water is absent and not detected by T4, the IC1 will not initiate the motor switch ON and the counting procedures, but T1/T2 stage will continue to be in its latched position and will prompt the procedures to restore as soon as water is detected later on in the course of time. Thus in such a situation the circuit will respond and reset only with the detection of water and not via the input clock trigger. Only once the IC1 counting gets over, and the latch breaks would enable the circuit to respond to a clock trigger for initiating a fresh start as described above.

Parts List for the above explained real time controlled water level timer controller circuit

R1, R3, R6, R11, R12, R13 = 100K
R2, R4, R5, R10, R9, R14, R15, R8 = 10K
R7 = 1M
P1 = 1M POT
R16 = 4.7K
C1 = 100uF/25V
C3 = 10uF/25V NON-POLAR, made by using 10nos 1uf/25v non-polar caps in parallel
C2, C4, C5 = 022uF
C6 = 470uF/25V
D1, D2 = 1N4007
T1, T5 = BC547
T2, T6 = 8050
IC1 = 4060

A Few Doubts as put forth by Miss Soumya (Answers enclosed under the questions)

sir, to be very frank dis ckt is above my expectation. m getting highly confused n not getting ny thing. nw m worried that I don't get failed in xam. ckt is bit complicated for me.

1) if m not rong, grey sq is motor. m rite ??

Yes grey square is the pump motor

2) hw can I trigger clock ? u told via digital alarm clock...but I didn't got hw. plz explain or suggest any other simple way.

A high output could be extracted from the digital clocks IC, or the speaker/piezo or from some relevant point that becomes high when the set alarm is triggered
3) once I trigger clock via alarm, hw can I set time for its operation.

The 4060 timer output can be set by sutably adjusting the variable resistor or the pot at its pin10. This will require little patience and the calibration will need to be experimented through some trial and error.

4) +12V DC supply.... 1 probe wil get connected to 12V battery +ve terminal. wil -ve terminal of battery open ??

-ve of the battery will connect with the line which is connected with pin8 of the IC, anywhere on that rail.

5) can I use common 12v dc battery for both d points.

answered in the previous question

6) off in green color n on in red color...wat r they ??

Those are LED indicators, when green is ON means pump is switched OFF, and when red is ON means pump motor is running.
7) c2,c4,c5 is 22mfd/25v na ??

Those are 0.22uF/50V not 22uF

8) plz elaborate on relay to be used & NC ??

N/C refers to normally closed, meaning the pole of the relay will be connected with this (N/C) when the relay is in a switched OFF state or deactivated state.

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