HC-04 interface with nRF51422https://devzone.nordicsemi.com/f/nordic-q-a/24298/hc-04-interface-with-nrf51422Dear Nordic Team, Thanks for supporting. Anybody work with ultrasonic sensor (HC-04). Please guide me. I am just interface with arduino example its working good. It have built in function for &quot;pulseIn&quot;. I dont know how to make this function in nRF51422en-USTelligent Community 13Wed, 16 Aug 2017 07:08:11 GMTRE: HC-04 interface with nRF51422https://devzone.nordicsemi.com/thread/95638?ContentTypeID=1Wed, 16 Aug 2017 07:08:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d5ecb46a-43d6-49bd-9908-2f63ecabe9bdJ&#248;rgen Holmefjord<p>@murugan, you can download the latest nRF5 SDK with support for nRF51 series (SDK 12.3.0) <a href="https://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v12.x.x/">on this page</a>. The example documentation is found here: <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/nrf_gpiote_example.html?cp=4_0_3_4_5_11">GPIOTE</a> - <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/nrf_dev_timer_example.html?cp=4_0_3_4_5_38">TIMER</a>.</p><div style="clear:both;"></div>RE: HC-04 interface with nRF51422https://devzone.nordicsemi.com/thread/95641?ContentTypeID=1Wed, 16 Aug 2017 04:10:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:86b42abd-b2a1-486a-88ce-db93273f6711Murugan<p>@RK , Thanks for your advice. But i am work with ESP8266 node mcu module. Its working fine</p><div style="clear:both;"></div>RE: HC-04 interface with nRF51422https://devzone.nordicsemi.com/thread/95640?ContentTypeID=1Wed, 16 Aug 2017 04:09:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:baf6b839-77e0-42ed-8e7b-52c56cfd1983Murugan<p>@Jørgen , Thanks for reply. Already i got that link but show me a error &quot;Object is unavailable&quot;.</p><div style="clear:both;"></div>RE: HC-04 interface with nRF51422https://devzone.nordicsemi.com/thread/95639?ContentTypeID=1Mon, 14 Aug 2017 12:25:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:819136d4-e90a-46b5-a7a4-69fc235e8a3dRK<p>And note that device appears to be 5v so think carefully about how you interface it (unless there&#39;s a 3v version I didn&#39;t find).</p><div style="clear:both;"></div>RE: HC-04 interface with nRF51422https://devzone.nordicsemi.com/thread/95637?ContentTypeID=1Mon, 14 Aug 2017 09:23:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:15fd7afe-15e5-4d56-98b4-80de5322c411J&#248;rgen Holmefjord<p>Hi,</p> <p>You need to configure the GPIO for HIGH/LOW sensing and use the generated interrupts to start and stop a timer.</p> <p>Check out <a href="https://devzone.nordicsemi.com/question/17257/pulse-duration-on-a-pin/">this answer</a>.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>