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Remote Controlled Wireless Water Level Controller Circuit

Last Updated on May 1, 2020 by Swagatam 139 Comments

For multi-storey buildings where water tanks could be at considerable heights over building terraces, monitoring the levels automatically could become a major issue. RF remote control modules have become pretty cheap nowadays which could be effectively used for solving the inconvenience. Let's learn how to make and install a wireless water level controller circuit for the same, requested by Mr. Sriram kp.

Technical Specifications

I am planning to implement this circuit for my home over tank. Because I am in 1st floor and tank is in 5th floor. In the above circuit, Instead of the push switches in the transmitter section,

if i arrange the terminals D0-D3 inside the tank means, as the water rises, the one by one D0-D3 will get in contact through the water and this will transmit the signal to the receiver. So the output LEDs in the receiver will turn on according to water level.

In transmitter, suppose D0 is the tank empty state means there will be no contact to none of the terminals inside the tank, so the LED in the D0 of receiver will turn off, at this state the motor should turn on.

After the water level starts rising, the D3 of the transmitter will get contact , so the D3 LED of receiver will turn on 

At this state the motor should turn off.
Please provide me the circuit for this...

caution electricity can be dangerous

The Design

The circuit may be understood as given under:

Here we incorporate two separate stages, one is our automatic water level controller circuit and the other is the RF remote control circuit.

Using Tx, Rx 433MHz RF Modules

The remote control has a Tx (transmitter) and and Rx (receiver). The transmitter is triggered through four discrete switches which encode and transmit the signals discretely into the atmosphere.

The receiver captures these signals, decodes it and sends it to one of the four outputs relevant to the decoded info.

This output responds by becoming high as long as the corresponding Tx switch is kept depressed.

The idea of the proposed water level controller through a remote control module is to press the Tx switches via relay contacts actuated by the water level controller circuit in response to the various water level conditions, as configured by the user.

The same has been implemented in the discussed design.

Referring to the figure, the gates gates N1 to N4 form the automatic water level controller circuit wherein the motor is switched ON when the level reaches a minimum lower threshold, and is switched OFF as soon as the level reaches the brim of the tank.

Originally Relay R1 was used for activating the motor by wiring its contacts to the motor and mains.

However for the present application, RL1 is rigged to one of the switches of the Tx module (S1)

Meaning now the Tx pin10 is engaged with the transmission of the signals as soon as RL1 is energized which happens on detection of an empty water tank.

Once this happens, the Rx responds by receiving the signals and triggering its own relay connected with the corresponding pinout.

This relay then activates the distant underground or overhead motor for the required water pumping.

The circuit diagram also shows three gates N5, N6, N7 which are configured as NOT gates for sensing the different water levels across the tank while the water is being pumped.

In the course these gates activate their own relays, which in turn close S2, S3, S4 for the necessary transmissions from the Tx to Rx.

The above transmissions are appropriately collected by the Rx, decoded and fed across its relevant outputs for illuminating the connected LEDs.

These LEDs provide the user with the info regarding the gradually filling water tank.

Thus the remote controlled triggering feature of the water level controller facilitates the owner a wireless and hassle free option of monitoring and controlling a distant situated tank.

The following figure shows the wiring details of the Rx or the receiver stage responsible for the toggling of the pump motor and various water level indications, in response to the Tx triggering signals.

Receiver Schematic

The RF modules can be sutudied in detail below:

https://www.homemade-circuits.com/2013/07/simple-100-meter-rf-module-remote.html

Parts List for the water level controller stage (N1----N4):

  • R1 = 100K,
  • R2, R3 = 2M2,
  • R4, R5, R6, R7, R8, R9, R10, R11= 10K,
  • T1 = BC547,
  • T2, T3, T4 = BC557
  • D1, D2 = 1N4148,
  • All RELAYs = 12V, 400 OHMS, SPDT, contact amps as per load specs.
  • N1, N2, N3, N4, N5, N6, N7 = IC 4093 (2nos.)

The last unused gate (N8) input must be terminated to ground or (+), output may be kept open.

The above wireless water level controller circuit was built and successfully tested by Mr. Sriram kp. The following images exhibit the results of his outstanding efforts:

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About Swagatam

Swagatam is an electronic engineer, hobbyist, inventor, schematic/PCB designer, manufacturer. He is also the founder and the author of the website: https://www.homemade-circuits.com/, where he loves sharing his innovative circuit ideas and tutorials.
If you have any circuit related queries, you may interact through comments, and get guaranteed replies from the author.

Reader Interactions

Comments

  1. Hemanta Dawn says

    August 10, 2023

    Need contact detail of PCB or Kit seller at Kolkata.

    Reply
    • Swagatam says

      August 11, 2023

      Sorry, I have no idea about it…

      Reply
  2. Raghu says

    September 6, 2020

    What is the battery life of this transmitter and receiver circuit ? In the comments I notice that there are comments which says that the circuit drains the battery very soon. I am planning to use it for my home purpose. I just need the water level indicator with alarm. i dont need the motor controller, etc. Is a readymade circuit available ?

    Reply
    • Swagatam says

      September 6, 2020

      If you need it only for indication purpose then you can remove all the transistor and NAND gate IC based stages, and use only the basic Tx, Rx modules with LEDs. In the transmitter module the S1, S2, S3, S4 points could be used as sensors for immersing inside the tank at different heights, for sensing the water levels at those points.

      The current consumption will be quite low, but till above 50 mA, and you will have to depend on a Li-Ion battery for long back up times.

      Reply
    • Mukesh says

      November 17, 2021

      Hi,
      I didn’t understand what is N1, N2…. N7??

      Reply
      • Swagatam says

        November 18, 2021

        Hi, those are nand gates found inside the IC 4093

        https://www.homemade-circuits.com/wp-content/uploads/2012/02/IC-4093.png

        Reply
  3. Mihir says

    July 2, 2020

    Hello Sir, im trying to implement the above circuit. however the circuit is supposed to be battery operated. The transmitters have a current consumption of about 9 – 40mA (for ASK) which is not feasible as it’ll drain the battery quickly. Can you suggest any RF transmitters (433 MHz) having low power consumption. I have searched and found out that OOK modulation consumes low power. Can you suggest me some OOK transmitters and their internal circuit diagram ? Transmitters are desired to have a current consumption of about 4.5 – 5 mA for 5 V input and a range of about 100 – 300m

    Reply
    • Swagatam says

      July 2, 2020

      Hello Mihir,

      you can try searching for “BC48R2020 315M/433MHz OOK Transmitter” you will be able to find the original HOLTEK datasheet

      Reply
  4. Prem says

    May 1, 2020

    Hi Swagatam,
    This remote-controlled-wireless-water-level looks good but I want only indicator not any relay to run motor. Can you please provide me simple circuit which will just indicate me about level through LED on unit which will be at lower level and people can act accordingly.

    Looking forward for your response.

    Reply
    • Swagatam says

      May 2, 2020

      Hi Prem, you can try the following diagram:

      remote water indicator

      The gate is from IC 4093.
      Repeat the above circuit for pin11, 12, 13 of HT12E transmitter circuit.

      In the receiver eliminate the transistor relay stage, and use only the LEDs for getting the required indications.

      Reply
  5. Neeraj says

    November 12, 2019

    Please
    Tell me resistance watt

    Reply
    • Swagatam says

      November 12, 2019

      all are 1/4 watt

      Reply
  6. AbdluRazakh Edakat says

    March 20, 2017

    Hi swagatham,
    Thank u very much to your valuable reply that published in ur web page!.
    Now I have an another doubt about the tx contro circuit.As you say I used a +5v relay in the circuit then ll compelsed to reduce the value of R5 as 220 ohm. Now it is working but some time do and not is the condition. That is why I cannot depend this tx vontrol unit. Actually what cn I do to get the accuracy for the circuit that need to be work properly means when ABC touches the water relay want to close and when AB leaves from waterand C lonely in water want to open the relay. Please be command.
    And you can watch your corcuit how I made in reality: by opening the link
    imgur. com/u5Edvtv and w.w.t.l control
    Thanking you.

    Reply
    • Swagatam says

      March 21, 2017

      Thanks Abdlu, It's R4 and not R5 which needs to be changed to 220 ohms, I hope you did this right?

      To increase accuracy, use a higher voltage supply inside water and check the response….if you are using 5V inside water then that might not work properly.

      sorry your link is not working

      Reply
  7. AbdluRazakh Edakat says

    February 11, 2017

    hi swagatham,
    I have a doubt about the above given article.can I control the tx and controling circuit completely with a +5 v power supply insted of +5,+12?.I want to control the tx circuit completely with a +5v supply by omiting +12v.is it possible? if so what changes need in the values of resistors?.please be helped

    Reply
    • Swagatam says

      February 11, 2017

      Hi Abdlu, it is possible if you don't intend to use a relay or if you replace the 12V relay with a 5V relay….no other changes would be required

      Reply
  8. Rama Krishna says

    October 29, 2016

    Hai I have a problem and doubts in the circuit I have tried and failed so please give your number so I can contact u

    Reply
    • Swagatam says

      October 30, 2016

      Hi, you will need to build the various stages separately and confirm them separately before making the final unit…

      you can specify your faults here I'll try to help

      Reply
  9. Rama Krishna says

    October 27, 2016

    Hi I have tried this circuit but its not working I need help

    Reply
  10. Sakthi Vel says

    July 28, 2016

    pls give u moter dry run protection circuts

    Reply
  11. Ashok Dhenge says

    July 25, 2016

    hi swagatam
    After long time i build this circuit with all tests, but now i have one problem with range. When i operate rf module at a distance of 15ft each are at different room it works, but when i go to building terrace there is no activity at receiver. I have question regarding anteena,
    1: What is length of anteena at both location?
    2: What are the type of anteena?
    3: i have 3 different pair of RF module, in which transmitter operate alternate but receiver section continuously on to receive signal. I used one common anteena for transmitter section and one common anteena for receiver section. is this ok?
    4: is there need to use seperate anteena for separate receiver and transmitter?

    please provide me guidance at this end point.

    Reply
  12. Karpov says

    July 19, 2016

    can u show me the complete circuit diagram

    Reply
  13. smily kittu says

    June 13, 2016

    hai could you plese tell me that total howmany wires to be immersed in tank (3 sensors & 3 water levels)?…

    Reply
    • Swagatam says

      June 14, 2016

      for controlling the pump there are three wires to be inserted as shown in the first diagram (wires A, B, C), the remaining wires shown can be used only for indication purpose to learn the exact position of the water through the respective illuminated LEDs.

      Reply
  14. Sridhar says

    May 15, 2016

    Can u plz post the complete ckt diagram once

    Reply
  15. anup paul says

    February 16, 2016

    Hi swagatam,
    I constructed this circuit and it works well but the range is only 1 meter. I used 1 ft wire as antenna. Can you advise what could be the reason for low range.

    Reply
    • Swagatam says

      February 16, 2016

      Hi Anup, 1 meter is very less, there could be some problem with your remote control modules, please check it separately ad make sure it's giving at least a 50 meter transmission range, otherwise you can think about getting it replaced with a new one…

      Reply
  16. Unknown says

    January 21, 2016

    Nice

    Reply
  17. anup paul says

    September 25, 2015

    Hi swagatam,

    If we install same system in two adjoining buildings just 10 meters apart, will they interfere in each other operations .Pls advise.

    Reply
    • Swagatam says

      November 16, 2015

      Hi Anup, yes certainly they will interfere, since the range of the system can be well over 50 meters.

      Reply
  18. anup paul says

    August 25, 2015

    Hi Swagatam, Just to clarify level1,2 and 3 are for LED indication of water level in the tank.Sensor A,B and C are to be dipped in OH tank. Can you pls clarify, sensor A to be kept at level to stop the motor and Sensor C at a level to start the motor.
    Can you make circuit to replace these sensors with Ultrasonic switches.

    Reply
    • Swagatam says

      August 26, 2015

      Hi Anup,

      yes level 1,2,3 are for indicating the different water levels by triggering the relevant Tx switches.

      for knowing the exact positions of the A,B, C sensors you can read the following article, which has all the details specifically covered:

      https://www.homemade-circuits.com/2011/12/how-to-make-simple-water-level.html

      Ultrasonic sensor is feasible but can be too complex and expensive, a better alternative could be in the form of float switches, as explained here:

      https://www.homemade-circuits.com/2014/05/making-float-switch-for-corrosion-free.html

      Reply
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