It turns out that I looked at this and determined the problem to some certainty: https://urldefense.proofpoint.com/v2/url?u=https-3A__bricks.stackexchange.com_questions_10586_nxt-2Dsensors-2Dnot-2Dworking_10617-2310617&d=DwIFaQ&c=eLbWYnpnzycBCgmb7vCI4uqNEB9RSjOdn_5nBEmmeq0&r=k6Oa5GxfBPFMgGjb2r5QIoEOeBZs9xbNIpA0kLw_kFQ&m=dkDUq5VKEfYyoip9IBChFeuhGSyYH7Owpgt_vq8xerI&s=1UDSqDoCj7qP6mqsiF0PsrV1WUckGd-TfmqvMM8uweg&e= Using a volt meter, and checking pins 3 and 4 with the robot ON, I was able to tell that there was no voltage going to the sensor. I set the screen to "View" > sensor > port # and checked the voltage. On a good robot, I get near 4.5V. On my suspect robot, I get 0.02V. Have any of you ever repaired a problem such as this? Just sharing my experience with you, and looking for next step. Donald Williams P.E. Phoebus High School 100 Ireland Street Hampton, VA 23663 757-727-1031 On Thu, Jun 6, 2019 at 12:48 PM Donald Williams < [log in to unmask]> wrote: > I haven't used the robots for a while and when I get them out, and I can > write programs and load the programs onto 12 robots. 11 of the robots work > fine, but one won't recognize the light or sound sensor. It recognizes a > touch sensor. I have verified the sensors works by swapping sensors and > cables with other robots (multiple times, with another teacher who is an > electrical engineer watching). If I try going to "View" the sensors (on the > correct ports), I get a value of "0". I have reloaded the firmware. > > Any ideas? > > > Donald Williams P.E. > Phoebus High School > 100 Ireland Street > Hampton, VA 23663 > 757-727-1031 > > > -- ---- CONFIDENTIALITY NOTICE: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is legally privileged, confidential and/or exempt from disclosure under applicable law. If you are not an intended recipient, you may not review, use, copy, disclose or distribute this message or any of the information contained in this message to anyone. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of this message and any attachments. Hampton City Schools may monitor e-mail messages to and from the Hampton City Schools network. Unintended transmission shall not constitute waiver of any privilege or confidentiality protected under federal statutes, the Virginia Freedom of Information Act or any applicable laws. -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. Visit https://listserv.jmu.edu/archives/vadcfll-ANNOUNCEMENTS-l.html to subscribe.