Normally the BBB automatically detects I2C devices right ? Astrid Hochart Product developer - QZabre LLC www.qzabre.com
On Tue, Jan 26, 2021 at 10:23 AM Astrid Hochart <[email protected]> wrote: > I tried 1Kohms and 10kohms but I still have nothing unfortunately.. > > Astrid Hochart > Product developer - QZabre LLC > www.qzabre.com > > > On Mon, Jan 25, 2021 at 6:48 PM Steve Lentz <[email protected]> wrote: > >> I can only speak from my experience. I have three Adafruit sensor >> breakouts connected on I2C bus 2. Each of these has its own 10K pull-up >> resistors. The last board did not work until I added an external 1K pull >> up. It is 100% reliable since then. I have built this twice and >> experienced the same thing both times. I spent a lot of time chasing >> software and asking questions on this forum. Five minutes with an >> oscilloscope showed me the real problem was that high values on the SDA >> line were not reaching 3.3V before it was sampled. Based on this, a >> logical next step is to add an external 1K pull up and see what happens. >> >> >> >> > On Jan 25, 2021, at 12:35 PM, Dennis Lee Bieber < >> [email protected]> wrote: >> > >> > On Mon, 25 Jan 2021 10:42:50 -0500, in >> gmane.comp.hardware.beagleboard.user >> > Steve Lentz <[email protected]> wrote: >> > >> >> Here is the diagram for my i2c device. This shows where the pull-up >> resistors are added. You will need something similar. >> >> >> >> But first check the documentation for the thermo-click to see if it >> already has pull-up resistors. It may have 2K, 5K, 10K already. Don’t >> allow the parallel resistance to go below 500 ohms. >> >> >> > >> > If I interpret the confusing schematic from >> > https://www.mikroe.com/thermo-9-click there appear to already be a >> pair of >> > 4.7k pull-ups on the board. >> > >> > >> > -- >> > Dennis L Bieber >> > >> > -- >> > For more options, visit http://beagleboard.org/discuss >> > --- >> > You received this message because you are subscribed to the Google >> Groups "BeagleBoard" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> an email to [email protected]. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/e70u0g58r86qs7ct4roe7b5fjpgk6pit1f%404ax.com >> . >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/C6fXDoWHEg0/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/F621C5DC-2FD4-4100-847E-90E367F84602%40gmail.com >> . >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAMV76sF86RK3gsNH6%2B5e%3DsxYCQmg%2BwxfCYy_KBov2WM5nX5HOg%40mail.gmail.com.
