{"id":7,"date":"2008-09-11T08:56:18","date_gmt":"2008-09-11T12:56:18","guid":{"rendered":"http:\/\/itp.nyu.edu\/blogs\/ia303\/2008\/09\/11\/digital-inout\/"},"modified":"2008-09-25T05:13:30","modified_gmt":"2008-09-25T09:13:30","slug":"digital-inout","status":"publish","type":"post","link":"https:\/\/itp.indiamos.com\/blog\/2008\/09\/11\/digital-inout\/","title":{"rendered":"PhysComp lab, week 1: Digital in\/out"},"content":{"rendered":"

First homework for Physical Computing<\/a>: Digital In Out<\/a>.<\/p>\n

\"Supplies<\/a><\/p>\n

11:15<\/strong>: I forgot how hard you have to pull to strip the insulation off the wire (or is it just me?).<\/p>\n

11:30<\/strong>: Wow, I totally remember that smell of hot soldering iron from my childhood. Nevertheless, I am the worst solderer ever.<\/p>\n

\"Switch\"<\/a><\/p>\n

11:45<\/strong>: Yes, worst solderer ever. Not being able to see anything close up anymore doesn’t help, either; obviously, I should have gone to ITP while I was still in my twenties and only half-blind.<\/p>\n

11:50<\/strong>: Oh, yeah—now I remember how to use wire strippers. Rotate.<\/p>\n

\"Arduino<\/a><\/p>\n

12:15<\/strong>: Looking up resistor values. Did I miss some introductory class where we were supposed to learn all this shit? Honestly, if I hadn’t spent weekend afternoons sorting resistors for my dad when I was in grade school, I think I’d be completely lost right now. Setting up a straightforward circuit on a breadboard should not be taking this long.<\/p>\n

\"Two<\/a><\/p>\n

Resistor Values<\/h3>\n

Cheat cheet: http:\/\/www.iguanalabs.com\/resistors.htm<\/a><\/p>\n

10 x brown black black gold = 10<\/p>\n

10 x brown black brown gold = 100<\/p>\n

10 x red red brown gold = 220<\/p>\n

10 x brown black red gold = 1,000<\/p>\n

10 x brown black orange gold = 10,000<\/p>\n

5 x orange black orange gold = 30,000<\/p>\n

5 x brown black yellow gold = 100,000<\/p>\n

12:50<\/strong>: Done sorting resistors, distributing into parts box, drawing and inserting labels.<\/p>\n

\"Parts<\/a><\/p>\n

1:15<\/strong>: Finally, my circuit looks like the photo on the website (well, except for the googly eyes). Woot!<\/p>\n

\"Artificial<\/a><\/p>\n

Does it do<\/em> anything, though?<\/p>\n

1:25<\/strong>: Aaargh! The answer to that question is, No.<\/em><\/p>\n

Problem uploading to board. See http:\/\/www.arduino.cc\/en\/Guide\/Troubleshooting#upload for suggestions.<\/p>\n

Binary sketch size: 1126 bytes (of a 14336 byte maximum)<\/p>\n

avrdude: stk500_recv(): programmer is not responding
\navrdude: stk500_recv(): programmer is not responding<\/p><\/blockquote>\n

1:28<\/strong>: Hmm. It uploads fine when nothing is connected to the board.<\/p>\n

1:30<\/strong>: Okay, the red LED lights up when I hold down the switch. The green LED doesn’t do anything, though.<\/p>\n

1:35<\/strong>: Troubleshooting<\/a>. Tried swapping the red and green LEDs: now nothing works. Replaced the green LED with a yellow one: nothing. Re-uploaded the program to the board (which worked just fine this time): nothing. Shite.<\/p>\n

Unplugged everything except the USB cable, hit reset, re-uploaded program: error message. Reset, tried uploading again: worked. Plugged breadboard back in: nothing happening.<\/p>\n

Hit reset, re-uploaded program: error message.
\nNo reset, re-uploaded program: error message.
\nReset, re-uploaded program: upload okay, but no lights.
\nJiggled all the connections. Nothing.
\nUnplugged & replugged USB cable, reset, re-upload: nothing.<\/p>\n

AAAAARRRRGGGHHH!!!! I give up.<\/p>\n

Reversed the legs of the yellow LED: lit up. Hmm. Reversed legs of red LED: lit up. Now both are lit. When I hold down the switch, both turn off.<\/p>\n

Reset, re-upload: error, both lights on.
\nReset, re-upload: okay, both lights on.<\/p>\n

Changed code to<\/p>\n

if (switchState == 1) {
\n \/\/ if the switch is closed:
\n digitalWrite(yellowLedPin, HIGH); \/\/ turn on the yellow LED
\n digitalWrite(redLedPin, HIGH); \/\/ turn off the red LED
\n }
\n else {
\n \/\/ if the switch is open:
\n digitalWrite(yellowLedPin, LOW); \/\/ turn off the yellow LED
\n digitalWrite(redLedPin, LOW); \/\/ turn on the red LED<\/p><\/blockquote>\n

Reset, re-upload: okay, lights off. Pressing switch turns both on.<\/p>\n

. . .<\/p>\n

YAAAAYY!! In switching the LEDs around, at some point I got one leg into the wrong row. Everything now works exactly as intended! Aaaand . . . it’s 2 a.m. Bummer. So much for Part II of this week’s homework: making a combination lock using a LEGO phone.<\/p>\n

So.<\/p>\n

I don’t feel like I had any idea what I was doing with this assignment, besides trying to copy the photo<\/a> exactly. I didn’t refer to the diagram<\/a> much, because I don’t really remember from high school<\/em> how to read an electrical diagram. All in all, I felt pretty uninformed. It would have helped to be doing this in the lab at school, surrounded by other cursing, frustrated people, but I would have had to bend space and time rather drastically in order to be able to work there. Other inhabitants of the universe might have thereby been inconvenienced.<\/p>\n","protected":false},"excerpt":{"rendered":"

First homework for Physical Computing: Digital In Out. 11:15: I forgot how hard you have to pull to strip the insulation off the wire (or is it just me?). 11:30: Wow, I totally remember that smell of hot soldering iron from my childhood. Nevertheless, I am the worst solderer ever.<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[12,11,4,8,6],"tags":[],"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p3qY10-7","_links":{"self":[{"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/posts\/7"}],"collection":[{"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/comments?post=7"}],"version-history":[{"count":1,"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/posts\/7\/revisions"}],"predecessor-version":[{"id":54,"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/posts\/7\/revisions\/54"}],"wp:attachment":[{"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/media?parent=7"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/categories?post=7"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itp.indiamos.com\/blog\/wp-json\/wp\/v2\/tags?post=7"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}