{"id":165,"date":"2015-09-22T02:58:38","date_gmt":"2015-09-22T02:58:38","guid":{"rendered":"https:\/\/einhugur.com\/blog\/?page_id=165"},"modified":"2021-04-15T13:19:08","modified_gmt":"2021-04-15T13:19:08","slug":"hc-sr04-ultrasonic-sensor","status":"publish","type":"page","link":"https:\/\/einhugur.net\/blog\/index.php\/xojo-gpio\/hc-sr04-ultrasonic-sensor\/","title":{"rendered":"HC-SR04 and US-015 – Ultrasonic sensors"},"content":{"rendered":"

In this example we are going to connect to HC-SR04 and or US-015\u00a0ultrasonic sensor.<\/h2>\n

(Updated 18. Oct 2015, adding US-015 sensor and sensor specs)
\n(Updated 18. Apr 2016, adding more info for accuracy for the HC-SR04 sensor)
\n<\/span><\/h6>\n

A ultrasonic sensor will send ultrasonic sound out which will echo on objects in-front of it and come back to the sensor. Using speed of sound then from the echo we can calculate the distance to the object.<\/p>\n

A sensor like this does not give good readings if object in-front of it is not at straight angle.<\/p>\n

Disclaimer:
\n<\/strong>We do not take any responsibility for possible errors in the guide or errors that you might do wiring it up. Incorrect wiring can result in damaged sensor or damaged Raspberry PI.<\/p>\n

The specs for the sensors:<\/strong><\/p>\n

Both sensors have pretty much same spec and in our test on short distance there was no notable difference. That does not mean there is no difference, their ability to detect small objects in the way at long distance may differ for example.<\/p>\n

Both sensors have exactly the same pin layout and functionality, so same wiring and same programming will apply for both of them.<\/p>\n

\"HC-SR04<\/a>
HC-SR04 Ultra sonic sensor<\/figcaption><\/figure>\n
\"US-015<\/a>
US-015 Ultra sonic sensor<\/figcaption><\/figure>\n

HC-SR04:<\/strong><\/p>\n

Range: 2 – 400 cm
\nResolution: 3 mm
\nMeasuring angle: 15 degrees
\nWorking voltage: DC 5 V
\nPins: 4<\/p>\n

US-015:<\/strong><\/p>\n

Range: 2 – 400 cm
\nResolution: 3 mm
\nMeasuring angle: 15 degrees
\nWorking voltage: DC 5 V
\nPins: 4<\/p>\n

Pieces we use in this example:<\/strong><\/p>\n