https://devzone.nordicsemi.com/f/nordic-q-a/26631/programming-the-nrf51822-beacon-kitI am struggling to find a starting point to be able to program the beacons. I&#39;m completely new to this but want to be able to change the tx power so that they are only visible within a meter of the receiver. Failing that, increase the power so that Ien-USTelligent Community 13Tue, 07 Nov 2017 09:44:59 GMThttps://devzone.nordicsemi.com/thread/104766?ContentTypeID=1Tue, 07 Nov 2017 09:44:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8876c702-ee54-47d0-aefb-c830c14c1e2cJoakim Jakobsen<p>Hi alidaf!</p> <p>There is a blog-post about <a href="https://devzone.nordicsemi.com/blogs/686/programming-the-nrf51822-beacon-kit-with-the-nrf51/">programming the nRF51822 beacon kit</a> using the nRF51 DK.</p> <p>You can change the radio&#39;s transmit power by using the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.api.v1.0.0/group___b_l_e___g_a_p___f_u_n_c_t_i_o_n_s.html#ga0f1931af876bef39520c58de5ac060ca">sd_ble_gap_tx_power_set()</a> function.</p> <p>You can change the tx power in your main.c file. I would change it about the same time as the advertising is started. If you reduce the tx power after a connection is established, the device might not be able to maintain the connection.</p> <p>In keil, you can compile your code by pressing this button:<br /> <img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/6661.button.PNG" alt="image description" /></p> <p>Or by pressing F7.</p> <p>Once compiled, you use nRFGo Studio to program the application and the softdevice.</p> <p>Let me know if you have any more questions.<br /> Best regards,<br /> Joakim.</p><div style="clear:both;"></div>