Reddit reviews HC–SR04 Ultrasonic Sensor - 2 Pack

We found 1 Reddit comments about HC–SR04 Ultrasonic Sensor - 2 Pack. Here are the top ones, ranked by their Reddit score.

Range: 2cm - 400cmPower: +5V DC Current: 15mAEffective Angle: <15 degreesDimension: 45mm x 20mm x 15mmTrigger Input Pulse Width: 10uS

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1 Reddit comment about HC–SR04 Ultrasonic Sensor - 2 Pack:

u/schorhr · 2 pointsr/arduino

Hello :-)

You can use a simple (leaver) switch when it bumps into something (or indeed use the flex sensor), but better would be a ultra-sonic sensor ($1 at Aliexpress or eBay, $5 at Amazon). Another method is something like a tcrt5000 infrared distance sensor, but it's vulnerable to ambient light. You could do this with the photocell as well (or line tracking).

http://www.ebay.com/itm/Ultrasonic-Sensor-Module-HC-SR04-Distance-Measuring-Sensor-for-arduino-DE-/172138007056?hash=item2814398a10:g:TRUAAOSwxp9W66st
https://aliexpress.com/item/Free-shipping-1pcs-Ultrasonic-Module-HC-SR04-Distance-Measuring-Transducer-Sensor-for-Arduino-Samples-Best/1872588324.html?spm=2114.010208.3.134.m847tO&amp;ws_ab_test=searchweb0_0,searchweb201602_2_10065_10000073_10068_10000074_10000032_119_10000030_10000026_10000023_431_10000069_10000068_10060_10062_10056_10055_10000062_10054_10000063_301_10059_10099_10000020_10000013_10103_10102_10000016_10101_10096_10000056_10000059_10052_10053_10107_10050_10106_10051_10000097_10000094_10000053_10000007_10000050_10084_10083_10000100_10080_10000047_10082_10081_10110_10111_10112_10113_10114_10115_10000041_10000044_10078_10079_10000038_10073_10000035_10122_10123_10121_10124,searchweb201603_2,afswitch_3,ppcSwitch_5,single_sort_2_price_asc&amp;btsid=6238d8bf-526f-46eb-b73a-a458a2d86108
https://www.amazon.com/HC-SR04-Ultrasonic-Sensor-2-Pack/dp/B01N391SE1/ref=sr_1_1?ie=UTF8&amp;qid=1487180048&amp;sr=8-1-spons&amp;keywords=hc-sr04&amp;psc=1

Also ad a $1 9g servo to pan the sensor :-)

What parts do you have besides the kit?