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I'm using a touch LCD whose content I want to change if the user moves toward it. For this I'm looking for an SMT proximity sensor with a 40~50 cm detection range. Space above the PCB is only 3 mm, so Sharp GP2D12 and the like are out.

note - I'm not looking for shopping advice ("where can I buy part xyz?"), but rather design advice ("How can I solve this design problem?")

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  • \$\begingroup\$ Answerers: Please be aware that this could be a bad shopping question. Please remember to include how you found the proximity sensor, so that Federico and other readers can find sensors applicable to their situation in the future. \$\endgroup\$
    – Kevin Vermeer
    Commented May 23, 2011 at 3:24
  • \$\begingroup\$ If you could edit your question to better conform to the FAQ, you'd learn more, get better answers, and get more votes. Please read the first section of the FAQ and peruse the [shopping] tag on Meta to learn about our policy on shopping questions. \$\endgroup\$
    – Kevin Vermeer
    Commented May 23, 2011 at 3:27
  • \$\begingroup\$ @reemrevnivek - I agree with Federico that this isn't a shopping question. There are lots of questions which have answers like "You could use a ...". Wouldn't that also be shopping advice then? \$\endgroup\$
    – stevenvh
    Commented May 23, 2011 at 7:15
  • \$\begingroup\$ @reemrevnivek: I read the first section of the FAQ, and it says questions about "a specific electronics design problem" are OK. Doesn't this apply to my question? \$\endgroup\$
    – Federico Russo
    Commented May 23, 2011 at 8:09
  • \$\begingroup\$ Your previous question was borderline, but the revised version is just fine. \$\endgroup\$
    – Kevin Vermeer
    Commented May 23, 2011 at 11:33

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Mouser's latest mailing mentioned this one: Vishay VCNL4000. For the price of the proximity sensor you also get an ambient light sensor. 4mm x 4mm, 0.75mm high, though it has three blobs on it which make it somewhat higher. Still looks like it's less than 3mm.

enter image description here

Detection range for the proximity sensor is only 20cm, though.

disclaimer: the mention of Mouser is not a shopping advice :-)

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