I am looking for a very small emitter/receiver ultrasound. Not to be confused with the distance meter. The device must be 2 in 1. Switch mode. Or should register a signal if it does not send. Only analogue. Very low power, up to 20 cm. No longer required. Without resonator. Looking for all day I can not find:(.
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\$\begingroup\$ Off-topic but also: have you considered that what you're looking for simply might not exist? Your requirements seem a but "random" and not well thought through. \$\endgroup\$– BimpelrekkieJan 22, 2019 at 10:41
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\$\begingroup\$ My question is not what it seems and what does not ... If you do not know the topic. Just go on. \$\endgroup\$– nimJan 22, 2019 at 17:25
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Why classical transceiver sensors like this one does not fit you?
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1\$\begingroup\$ This isn't an answer, it should have been a comment. \$\endgroup\$ Jan 22, 2019 at 10:51
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\$\begingroup\$ Maybe it is, maybe he didn't know that same sensor could transmit and receive. \$\endgroup\$– ShiroJan 22, 2019 at 11:15
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\$\begingroup\$ @Shiro Thanks, this looks like what I'm looking for. Fools more. They do not know what sound can emit, it can also register its presence. \$\endgroup\$– nimJan 22, 2019 at 17:39