Dtmf decoder for mobile phones

Discussion in 'The Projects Forum' started by Harikrishnansk, Feb 15, 2014.

  1. Harikrishnansk

    Thread Starter New Member

    Feb 15, 2014
    1
    0
    Hai sir,
    I am doing a project on cellphone based remote controller for water pump.i have just connected the dtmf decoder part using ic mt8870 and connected leds to pin 11,12,13,14 . When I supplied a 5 v as vcc ,1 leds lights up without cellphone in the circuit.i have not connected the cell phone to the circuit but one of the leds light up what can be the reason. Also can we connect all cellphones,to the circuit. How can I connect my cellphone with the circuit. Pls rply soon.if possible today itself.
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    can you post your circuit please?


    manual
     
  3. burger2227

    Member

    Feb 3, 2014
    190
    24
    How are you connecting your cell phone to the pump? Does it have its own number? The decoder is meant to read signals from a land line.
     
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