https://devzone.nordicsemi.com/f/nordic-q-a/8783/how-to-turn-an-external-led-connected-to-nrf51822-board-from-nrf-master-control-app-in-mobile-please-tell-me-the-codeI have the Heart Rate Service(HRS) program written in embedded c. I connected a two LEDs to nrf51822 board. One LED will start blinking when advertisement starts and other LED has to turn ON whenever i send a command from &#39;&#39;nrf master control&#39;&#39; app inen-USTelligent Community 13Wed, 19 Aug 2015 05:21:00 GMThttps://devzone.nordicsemi.com/thread/32224?ContentTypeID=1Wed, 19 Aug 2015 05:21:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f9210635-2974-4eff-886b-cb9e65a454e7Swamy <p>Thank you Stian</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/32223?ContentTypeID=1Tue, 18 Aug 2015 14:21:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:775c4134-e4cf-499c-baa0-360844bcdb80Stian R&#248;ed Hafskjold<p>I added a makefile to the repo just now. Download the SDK 8.0.0 zip-file, and place the example code in the <strong>ble_perpheral</strong> folder. It should compile using armgcc now.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/32222?ContentTypeID=1Tue, 18 Aug 2015 09:36:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dd39f7ee-af11-43ef-b555-e4c40c90bf10Swamy <p>Thank you for the answer but where will i get Makefile to compile this program?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/32221?ContentTypeID=1Tue, 18 Aug 2015 09:12:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:366c5c4a-f0de-49e7-81ab-6fb879362285Stian R&#248;ed Hafskjold<p>You can check out the &quot;LED-button&quot; example code here on github: <a href="https://github.com/NordicSemiconductor/nrf51-ble-app-lbs">github.com/.../nrf51-ble-app-lbs</a></p> <p>It shows how to add a characteristic that you can write to in order to toggle a LED on the nRF51 DK.</p><div style="clear:both;"></div>