https://devzone.nordicsemi.com/f/nordic-q-a/7502/how-to-increase-reading-pin-speedHi, Here is output of my chip and i want to read it but there is a problem 25 uS low width (T) is to quick for nRF51822 Can you give me some tips, how to read this 3 signal with this chip? is it possible to read it with I2C?en-USTelligent Community 13Thu, 11 Jun 2015 14:48:30 GMThttps://devzone.nordicsemi.com/thread/26679?ContentTypeID=1Thu, 11 Jun 2015 14:48:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7f2def26-6039-45f7-a63b-f1ed23fe1c39john kotkin<p>Thank you for your answer actually my problem solved by not using softdevice, when i&#39;m using s110_nrf51_8.0.0_softdevice.hex i see nRF51 go slow but i still have problem because i need softdevice + fast IO</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/26678?ContentTypeID=1Tue, 09 Jun 2015 01:08:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e4fba9dc-a34c-41d7-b916-c2b634656c42RK<p>What makes you believe that 25µs is too quick? What are you doing to try and read it? 25µs is slow, it&#39;s 40kHz, that&#39;s within the nrf51 series ability to sense by more than 2 orders of magnitude (ie more than 100x). There should most definitely be no problem reading/writing at that speed (unless you&#39;re trying to use the softdevice at the same time).</p> <p>So what are you doing, post some code? Are you using the I2C or trying to read it yourself? Looking at the I2C specs it&#39;s even below the minimum I2C speed which is 100kb/s, this is 40kb/s.</p><div style="clear:both;"></div>