https://devzone.nordicsemi.com/f/nordic-q-a/21036/i2c-doesn-t-work-on-nrf51822-mbedHello, I have a problem running nRF51822DK with temp. sensors while running BLE. I tried DS18B20 but it doesn&#39;t work at all, then TMP36 with ADC reading and as it works &quot;as a standalone&quot; without enabling BLE it gives false readings when BLE stuff isen-USTelligent Community 13Wed, 05 Apr 2017 09:34:19 GMThttps://devzone.nordicsemi.com/thread/82182?ContentTypeID=1Wed, 05 Apr 2017 09:34:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2e07af88-89af-4669-a1a8-823b61eccf83J&#248;rgen Holmefjord<p>Are you using the nRF51 DK? p27 is connected to the 32.768 kHz crystal and should not be used for I2C/TWI. Try changing the pin to 29 etc. In our SDK P0.07 and P0.30 is used for SDA and SCL.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/82181?ContentTypeID=1Tue, 04 Apr 2017 21:14:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5bbe7259-d347-469e-bf5f-963893227d3ekrul_serwisu<p>This is the main file: <a href="https://www.dropbox.com/s/4lmyof7eox4hdqf/main.txt?dl=0">www.dropbox.com/.../main.txt</a> And I used that as a base: <a href="https://developer.mbed.org/teams/Bluetooth-Low-Energy/code/BLE_Thermometer/rev/30f6f65629b5">developer.mbed.org/.../30f6f65629b5</a></p> <p>The problem is that when I add &quot;ADT7410 tempSens1(p28, p27, 0x90, 100000);&quot; declaration it compiles properly but BLE doesn&#39;t work.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/82180?ContentTypeID=1Mon, 03 Apr 2017 10:32:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b4aacbcd-8cf6-443f-9a08-cb70ad08ebe6J&#248;rgen Holmefjord<p>Could you provide some more details on what errors you are seeing? And some code showing how you use I2C and BLE?</p><div style="clear:both;"></div>