ADC LV-maxsonar Ez1 range finder o/p voltage

Replies

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  Stephen_c

  well according to me... u are dividing your vcc by 512 for each inch...as a result you are getting 9.8mV/inch but if u consider the range of 254 inch the max output voltage u will get is 9.8mV/inch*254 which is abt 2.499V . try to use scaling factor of 254 which will simplify your adc values.. also X = (98mV/5) * 255 = 4.998=5 is not right. ..at 98 mV you have distance of 10 inch.. so if you use scaling factor of 254 than you will get value of 10. Hope this helps
  
• 

  satanas

  hi stephen,
  
  the scaling factor of Vcc/512 is an "in-built" one.. it's not me who decide on the factor.. so u see the problem.. the idea of dividing by 256 is similar to amplifying the analog o/p by a factor of 2 but i can't really divide by 256. anyone used this sensor before??
  please help!
  
  satanas
• 

  Stephen_c

  so max output u will get is 2.5 volts.. either u configure your adc to accept 2.5 volt as high value or use an op-amp to convert value to 5V.. also the value in the adc resiostor can be dsigned ot have values corresponding to voltages ... for e.g. for 1 volt input value should be x than for 2 volt input value should be y.. i dont know how the register allocation in uC work.. but i hope this helps