How do I solve error &quot;Device family must be defined. See nrf.h.&quot;?https://devzone.nordicsemi.com/f/nordic-q-a/9287/how-do-i-solve-error-device-family-must-be-defined-see-nrf-hWhen creating my own project in Keil for the NRF51. I get this error when including files that include nrf.h. I do not have this problem in the example projects with the NRF51. When I try to find where the device is defined in these example projects Ien-USTelligent Community 13Fri, 26 Feb 2021 01:47:33 GMTRE: How do I solve error "Device family must be defined. See nrf.h."?https://devzone.nordicsemi.com/thread/296403?ContentTypeID=1Fri, 26 Feb 2021 01:47:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:23a02057-3d08-46a7-b5f0-cd4a735f565dHenry_Chou<p>Project configuration. Not file option.</p> <p>There are many definitions there. The include file directory , definition option,memory mapping or so on.</p><div style="clear:both;"></div>RE: How do I solve error "Device family must be defined. See nrf.h."?https://devzone.nordicsemi.com/thread/296176?ContentTypeID=1Thu, 25 Feb 2021 09:30:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d05226e0-d4f0-4f22-8d90-0d8bb1bda600SHALANES<p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1614245306287v1.png" alt=" " /></p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1614245325881v2.png" alt=" " /></p> <p>Still can&#39;t find it in options , is that a code or file?</p><div style="clear:both;"></div>RE: How do I solve error "Device family must be defined. See nrf.h."?https://devzone.nordicsemi.com/thread/296173?ContentTypeID=1Thu, 25 Feb 2021 09:20:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab8ab2e8-120e-4552-ad80-9ae04f3d51a0Henry_Chou<p>emproject&nbsp;&nbsp;</p> <p>c_preprocessor_definitions</p> <p>You may check your&nbsp;configuration in emproject.</p><div style="clear:both;"></div>RE: How do I solve error "Device family must be defined. See nrf.h."?https://devzone.nordicsemi.com/thread/296157?ContentTypeID=1Thu, 25 Feb 2021 08:12:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4eb6c50b-f82b-4cfa-ac14-bc26710af726SHALANES<p>May I know how to set it up in SES?</p><div style="clear:both;"></div>RE: How do I solve error "Device family must be defined. See nrf.h."?https://devzone.nordicsemi.com/thread/34266?ContentTypeID=1Thu, 17 Sep 2015 08:59:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:23274d72-89f9-47a8-812d-dbd63b7203d3LuGr<p>This worked, thank you.</p><div style="clear:both;"></div>RE: How do I solve error "Device family must be defined. See nrf.h."?https://devzone.nordicsemi.com/thread/34265?ContentTypeID=1Thu, 17 Sep 2015 08:51:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7412ede9-51d8-4ad0-9b34-4a3741b16039Wojtek<p>In keil: Options for target -&gt; C/C++ -&gt; Preprocessor symbols - Define -&gt; Add &quot;NRF51&quot; there</p><div style="clear:both;"></div>