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Thread: Advanced Water Level Indicator

  1. #11
    Senior Member T-1000
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    Its basically injecting a high frequency carrier wave on the power lines in your home (the live and neutral of your electric mains) and then modulating it. Its complicated and more importantly, very risky.
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    Mohit Mahajan,
    www.BioZen.co.in

  2. #12
    Member Advanced User MGear's Avatar
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    Thanks Mohit but if you've read earlier posts then you'd know I might not work on Home AC supply.

    Aint there any technique to send signals over DC power supply ?

  3. #13

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    Quote Originally Posted by MGear View Post
    Aint there any technique to send signals over DC power supply ?
    You can go for serial (USART) communication. You will need two wires for that though. One signal wire and one Gnd.
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  4. #14
    Super Moderator T-1000 docel's Avatar
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    Hmmmm... looks like a Water level Detector Robot...

    There are 2 practical ways of doin this : RF & Voice.
    Everyones covered the RF part, so let me tell you about the Voice part.

    The Tx part is a 555 timer Ic ( CMOS is better suited for its stability) as a multivibrator. The' R' is an LDR in a pipe. at the top end and an LED at the bottom. Water in the pipe will attenuate the light falling on the LDR and change the OP of the 555 at pin 3. If the RC is calculated for audio frequencies, the 555 will sing different notes at different water levels. Connect pin 3 to the cheapest 433mhz RF TX.
    The RX can be connected to a Micro ( if you are a coding buff) or to a set of 567 tone decoder ICs.
    The 567 IC ( Read the datasheet ) will respond to specific frequencies by a tunable Preset resistance. You can either get a digital o/p for specific levels with any number of 567s in parallel or get a continuous audio tone from the RX, depending on the level of water.
    An Audio Freq to Voltage converter circuit can give you a LED bargraph visual output. There are many Simple discrete circuits to hi-funda DSP algos for this. The choice is yours.

    ps: it can be a simple 2wires from the 555 to the 567 too. dont worry about cable power drop- it is good to a cool 1/2Kms, if you use a 12v at both ends.
    Last edited by docel; 06-04-2010 at 02:46 PM. Reason: for the 'ps'
    docel
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  5. #15
    Member Advanced User MGear's Avatar
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    @Docel: Wow that was a twisted approach I never thought of !
    I appreciate your complex thinking but do you really think its necessary to use optical transducers ? Or use voice band frequency for analog comm. ?
    I might be prompting for wrong reason, but still, enlighten me.

  6. #16
    Super Moderator T-1000 docel's Avatar
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    Talking Twisted Voice over water water level annuciator

    Thank you 2MGear , for your wonderful observations!

    Well, I thought a little advanced technology may very well be utilized here.

    1. All communication of ALL types is through Voice band.
    2. Nothing wrong in using Optical transducers for the job- it guarantees Isolation- Keeps the water pure.
    3. Nothing wrong in Voice band frequency. Infact, Voice band is the best as it automatically filters out the noise band.
    4. The system doesn't bother whether it is Digital or Analog comm. All it bothers about is the best way of conveying the message from point A to point B.
    5. The entire project is energy efficient and error free.

    ...I'm serious !
    docel
    ^Anything is possible..
    after YOU prove it!!

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  7. #17
    Member Advanced User MGear's Avatar
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    Thanks Docel!
    I got your point and will be working on this project the way you suggested ... This might take some time as i'll need to implement it my way!
    Will be posting pics as soon as the work finishes!

  8. #18
    Super Moderator T-1000 docel's Avatar
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    ...never thought you'd swallow that !!!
    I Just tried to make a very simple, practical project as complex as possible. The thing can be made in about 3hrs flat.

    To further convince you: I have made 1000s of this very same thing as a commercial product, and it has never failed. It was used both for non-contact liquid level measurement as well as to test attenuation of 5Km long RF/AF Co-ax cables.

    Let me know if there are any hiccups- will help you out.
    Last edited by docel; 06-05-2010 at 11:45 AM. Reason: Grammer
    docel
    ^Anything is possible..
    after YOU prove it!!

    http://bangalorerobotics.tripod.com

  9. #19
    Junior Member Newbie Blacksteel's Avatar
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    If it's wireless that you're into, then have a look at this -> http://letsmakerobots.com/node/21596

    I was equally frustrated with the tank overflow problem and made this. It uses a RF 434 MHz wireless link bought from an online shop in India. I'll be trying out the relay interfaces for the motor and let you know if it's worth in fully automating it.

    If there's any other query pls feel free to ask.
    ______________________
    Arvind

  10. #20

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    I dont know powerline comm
    but

    To sense water level you can use many methods
    Contact
    1. Using a simple wire and a transistor
    3. Using float sensor
    4. Pressure sensor
    Contactless
    4. Ultrasonic Sensor

    For communication you have below options
    Wired
    RS485 using a twisted pair wire
    RS232/UART
    Wireless
    RF Module
    XBee Module

    If you are going wired, I suggest you RS485

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