**** BEGIN LOGGING AT Fri Jan 17 02:59:57 2020 Jan 17 03:13:24 Otay. I done did it again w/ the help of beagleboard.org on github.com! Jan 17 03:13:30 Bee knees! Jan 17 03:20:49 I think that lesson/tutorial was for the Cape and not for the BBB directly. Blah. Jan 17 03:47:16 is the pru_cape.gel file still around? Jan 17 10:22:26 is the bone-debian-9.9-iot-armhf-2019-08-03-4gb.img.xz image supporting the Wi-Fi one? If yes, what's the systemd service i could have disabled while booting from the same MicroSD but on a Etherent BBB? Jan 17 13:28:24 the iot and lxqt images include wifi support, the console image does not (I think) Jan 17 13:28:41 and I don't understand your question Jan 17 15:57:18 m Jan 18 00:13:49 Hello! Does anyone have any ideas that are basic I should present at the maker faire w/ the BBBW or other related board? Jan 18 00:14:12 Bots and Basics! Jan 18 00:15:50 A presenter should know stuff. Since I am presenting, I think I should know things. I think since children will be present, I need to have some ideas that are very basic. Does anyone have experience w/ dealing w/ children in the electronics field? Jan 18 00:20:01 LEDs and blinking lights Jan 18 00:20:26 Okay. Jan 18 00:21:23 I noticed last time that the children loved the LED displays on hand. There were some people that put a r2d2 together w/ loud noises and LEDs. Jan 18 00:22:18 Man...I had this child hooked on mechanics and then the bot was supposed to move. That is when I found out that my bot-a-roo did not move. WiFi! Jan 18 00:22:38 Oh well...this year everyone is more prepared. Jan 18 00:22:43 or Bluetooth Jan 18 00:22:58 ds2: I know nothing about Bluetooth (yet). Jan 18 00:23:01 we had a color seeking robot one year at MF and the kids loved it Jan 18 00:23:11 That sounds neat. Jan 18 00:23:48 There was this one child at the faire. He picked up a controller and started to move this person's bot. His mother came around and whooped him for doing it. Jan 18 00:23:54 forgot if it is around a BBW or a BBB Jan 18 00:24:01 heheh Jan 18 00:24:02 I tried to not laugh but children will be children. Jan 18 00:24:10 Yep. Jan 18 00:24:12 It was funny. Jan 18 00:24:37 I am bringing the BBGW and BBBW this year for a replacement bot and some basics. Jan 18 00:24:45 WiFi is a problem... at least at MFBA Jan 18 00:24:52 Right. same here. Jan 18 00:25:07 People are greedy w/ their WiFi. Jan 18 00:25:09 make the bot automonmous Jan 18 00:25:24 are you a Ham? Jan 18 00:25:33 I was thinking that idea would be nice but...Ham? Jan 18 00:25:42 yes, amateur radio operator Jan 18 00:25:43 Radio? Jan 18 00:25:44 Oh. Jan 18 00:25:49 No, I am not. Jan 18 00:26:03 No hams here. Jan 18 00:26:09 if so, have the bot seek a small beacon on your body... less interference in the ham bands then on 2.4G at MF Jan 18 00:26:19 Oh. Jan 18 00:26:46 That makes sense. See, Bluetooth and ham are out of my league this year. Jan 18 00:27:04 I have two months and I have not been planning and getting ready like I should have been doing all along. Jan 18 00:27:15 USB cam and have it follow a QR code Jan 18 00:27:23 (or PRU cam if you are ambitious) Jan 18 00:27:51 Hmmm. ds2: I just started learning more of the PRU stuff this year. I am not ready for that idea just yet. Jan 18 00:28:12 I have a Prabakar book where he sets up a cam for his BBB. Jan 18 00:28:12 :D Jan 18 00:28:40 I was thinking I could set it up but I have not got around to it just yet. Jan 18 00:28:45 too bad MF's are not timed with Holloween Jan 18 00:28:56 otherwise a head that follows faces around could be fun Jan 18 00:29:03 Ha. Yep. Jan 18 00:29:38 it is really too bad the available models for BBAI are so few Jan 18 00:29:46 I am setting up a brainstorm right now. Jan 18 00:29:48 Right! Jan 18 00:29:57 do you have a BBAI? Jan 18 00:30:07 Yes. I got one. Jan 18 00:30:11 One only, though. Jan 18 00:31:11 I got the am5xxx TRM, the BBAI info, schematics, and other related info. for the onboard chips. Jan 18 00:31:40 It may take me some time to look at everything since i am a scatterplot of ideas. Jan 18 00:32:01 Centralized is not me, for now. Jan 18 00:32:01 but do you have TIDL running on it? Jan 18 00:32:32 Yes/No. From what i read, it is running on the board but I have not attempted to set it up just yet. Jan 18 00:32:36 it can run face recogonition reasonably quick (compared to the BBB/BBW) Jan 18 00:32:48 Right. b/c of the eve's right? Jan 18 00:33:31 I think that will be for when 2021 comes around for me if another board has not popped out. Jan 18 00:34:06 I saw one w/ kg2 or something. I am not familiar w/ that chip nor the am5xxx. So, time will tell. Jan 18 00:35:55 and ds2...thank you for replying to me and my address the other day. Jan 18 00:36:02 I am sorry. Jan 18 00:36:57 set_: no biggie Jan 18 00:37:59 Thank you. Jan 18 01:12:30 set_ PRU still at odds with you? Jan 18 01:29:56 Nope, not right now. Jan 18 01:30:01 I am on a mission. Jan 18 01:30:16 BrainStorms, Part Deaux! Jan 18 01:42:39 hey put the brain back in that head. Jan 18 01:50:18 GenTooMan: Trying over here. It is not easy being this cheesy. Jan 18 02:13:31 How do I account for forward voltage in my LED schematic for a BBGW? My brain is at a loss right now for some reason. I am reading and attempting to understand basic math. Nothing is getting through right now. Jan 18 02:13:49 I am trying to understand resistance. Jan 18 02:14:13 I have my 3.3v and my pin mA at 0.04. Jan 18 02:14:31 resistance is voltage divided by current, that is it's the element resisting current flow. Jan 18 02:14:43 set_ what is your forward voltage for the LED? Jan 18 02:14:57 Generic but maybe 5mA? Jan 18 02:15:27 No. Sorry. I have only a red LED, a generic. Jan 18 02:15:35 I have no datasheets for this generic. Jan 18 02:16:16 are there any up to date minimal debian images for the beaglebone black or is IoT the most stripped down image that I'm gonna find? Jan 18 02:16:22 what is the spectral output 630/640 nm etc? Jan 18 02:16:51 apart from making your own? very likely. Jan 18 02:16:51 I was thinking that w/ my R = Vs - Vf / If? Jan 18 02:17:33 set_ no R = (Vs- Vf)/If those parenthesis mean something :D Jan 18 02:18:28 actually Vs no Vdd or Vcc yes.. Vs normally refers to GROUND. Jan 18 02:18:49 Got it. So, right. sys_3v = 3.3v or Vs. Jan 18 02:19:16 and Vf = 5v for a generic, red LED? Jan 18 02:19:28 and If = 0.04? Jan 18 02:19:39 For 4mA? Jan 18 02:19:39 so for example if Vf = 2.2 then R = (3.3-2.2)/0.005 Jan 18 02:20:02 set_ that would be 40ma Jan 18 02:20:11 Right. I get basic math but I am not making the connection, oh. Jan 18 02:20:19 0.004? Jan 18 02:20:23 right. Jan 18 02:20:26 Oops. Jan 18 02:20:35 an order of magnitude off is quite large Jan 18 02:21:05 Forward voltage or Vf is 5.0 for a read LED (generic)? Would that be a good guess? Jan 18 02:21:14 red = read Jan 18 02:21:20 umm NO? Jan 18 02:21:24 Oh. Jan 18 02:21:35 What did I miss? Jan 18 02:22:00 read an actual data sheet set.. that's the normal REVERSE voltage, which is completely different Jan 18 02:22:35 Okay. I was protecting the BBGW instead of making my findings understood. Yikes. Jan 18 02:22:47 Off to a real datasheet. Jan 18 02:23:44 https://www.kingbrightusa.com/images/catalog/SPEC/APTD2012LSURCK.pdf Jan 18 02:24:17 https://learn.adafruit.com/assets/3903 is something I am looking at... Jan 18 02:24:18 Oh. Jan 18 02:24:20 Okay. Jan 18 02:24:27 if Vf > 3.3, it won't light up. Jan 18 02:25:15 So, I would expect forward voltage to be somewhere near 20mA? Jan 18 02:25:32 ds2 depends on the LED Jan 18 02:25:32 For a cheap-0, depot RED LED? Jan 18 02:25:47 Damn. I should have known to not invest in cheap LEDs. Jan 18 02:25:53 I mean, dan.g Jan 18 02:25:58 dang. Jan 18 02:26:25 set_ again now that's If Vf is what you are looking for go to page 2 If = 30ma and Vf = 1.75 (typical) 2.1 max and 1.5 min Jan 18 02:27:22 so (3.3v - 1.75)/.004 Jan 18 02:27:30 Okay. I saw 30mA on that page but I also read that my type of through hole LEDs usually have a If of 20mA. Jan 18 02:28:04 GenTooMan: hm? Jan 18 02:28:12 GenTooMan: Let me get the link. Jan 18 02:28:18 go to page 3 look for Forward Current vs. Jan 18 02:28:18 Forward Voltage Jan 18 02:28:30 that is just a fact, if you have a LED with Vf > 3.3, it will not light up on a 3.3V source. Jan 18 02:28:36 doesn't depend on anything :D Jan 18 02:28:47 https://learn.sparkfun.com/tutorials/resistors/all#example-applications Jan 18 02:28:53 It says, "for basic LEDs." Jan 18 02:29:01 I have a very basic LED set. Jan 18 02:31:51 1.80 = Vf, right/ Jan 18 02:31:52 ? Jan 18 02:32:17 So, anything in the middle of 2.1 and 1.5. Jan 18 02:32:30 I will test it. Jan 18 02:33:25 set_ ... red LED I gave you a typical red LED for 630nm forward voltage. I suggest you stick with that. try 390 ohm resistor shouldn't be too bad. Jan 18 02:33:57 (3.3 - vf)/i_f comes out 387.5 Jan 18 02:34:09 I can do the work. I am trying to understand more than I need to make sure it is embedded in my speech when the children have questions. Jan 18 02:34:38 Their parents may bring them to the place and have questions or inquiring ideas. Jan 18 02:36:13 I just did not understand forward current for some reason = no datasheet on generics! Jan 18 02:36:34 It was beating me senseless. Yes. Again. Jan 18 02:36:36 bring a data sheet and explain "you don't want to use something outside the manufacturer’s specifications" so ... and have highlighted Vf If and current look at page 3 for the If vs Vf curve Jan 18 02:36:50 Okay, okay. Jan 18 02:37:28 I will go to the people I ordered from. They should have some ideas. Hopefully but it was circa 2014. Jan 18 02:37:29 Ha. Jan 18 02:37:43 They most likely will not remember me. Jan 18 02:38:01 for example if the Vf of the LED is 3.5V at 200ma it may be be 100ma at 3.3v (ds2) Jan 18 02:38:21 Good wear a mask to help with that :D Jan 18 02:38:32 "Remember me? Jan 18 02:38:33 " Jan 18 02:38:51 Well do you have the part number and what was on the web site? Jan 18 02:39:28 No. No part number. Well maybe. Let me go and see. Adafruit.com. Jan 18 02:39:48 I got some cheap ones to learn on years ago and never really tested them out. Jan 18 02:41:38 https://www.adafruit.com/product/299 <-- these? Jan 18 02:42:05 they include a datasheet :D Jan 18 02:42:42 ironically same company and similar LED :D Jan 18 02:43:24 Nope. Jan 18 02:43:54 They came in a small bag. There were many of them in different colors. I might be wrong. I just checked the order history. Jan 18 02:44:04 from whom? Jameco Circuit specialist Digikey Mouser? Who_cares_about_leds.com. Jan 18 02:44:14 it may have come from an unknown source. Jan 18 02:44:15 Right. Jan 18 02:44:28 I cannot tell. No traceability. Jan 18 02:44:38 Dang it. Jan 18 02:45:30 you ordered from ada fruit? likely king bright because they are the largest LED producer in the world (die wise) most of the others buy the LED die from them and package accordingly. Except broadcom. Jan 18 02:45:46 Okay. Jan 18 02:46:44 are they 5 or 3mm? Jan 18 02:47:11 I was just researching that idea. I think 4mm. Let me measure. Jan 18 02:49:02 5mm. Jan 18 02:50:43 I got green too. Jan 18 02:50:54 Funny you don't look .. oh an LED Jan 18 02:51:18 Ha. I thought they were mostly red. I must have used all my red ones. Jan 18 02:51:42 Yes their smoking ruin can attest... :D Jan 18 02:51:49 No, no. Jan 18 02:51:56 No smoking LEDs over here. Yet. Jan 18 02:52:16 W/ how little I know, I sure have done well. Sort of. Jan 18 02:52:35 and, if, or... Jan 18 02:53:10 well remember Vr (reverse voltage?) typically they have that at 5V for a good reason because if you put it in backwards the LED won't go boom. Jan 18 02:54:02 Ha. Got it. I was unaware of that idea. Jan 18 02:54:22 "See, what you have to do it this. Stick it in backwards!" Jan 18 02:55:59 Okay. So, I think about 375ohm resistor should work. Jan 18 02:56:15 That was a long time in the making. Jan 18 02:57:34 But...I just read that the minimal and maximum were about 1.85 to 2.10. Jan 18 02:57:58 I accounted for the minimum only but had it at 1.8. Jan 18 02:58:07 Off to the math conundrum again. Jan 18 02:58:08 Sheesh. **** ENDING LOGGING AT Sat Jan 18 02:59:59 2020