https://speedysignals.com/2013/08/01/how-to-assemble-stair-lights/https://speedysignals.com/wp-content/uploads/2013/08/schematic.pngschematichttps://speedysignals.com/wp-content/uploads/2013/08/screen-shot-2015-12-01-at-08-46-43.pngScreen Shot 2015-12-01 at 08.46.43sample stairs lightshttps://speedysignals.com/wp-content/uploads/2013/08/screen-shot-2015-10-18-at-14-57-14.pngScreen Shot 2015-10-18 at 14.57.14stairs lights demohttps://speedysignals.com/wp-content/uploads/2013/08/screen-shot-2015-10-18-at-15-00-08.pngScreen Shot 2015-10-18 at 15.00.08https://speedysignals.com/wp-content/uploads/2013/08/stairspcb-1-1.pngstairsPCB-1-1https://speedysignals.com/wp-content/uploads/2013/08/2014-10-28-00-10-47-21.jpg2014-10-28-00.10.47-2PCB with connectors. I originally wanted to use the red connectors but I didn't realize they were too thick, so now I recommend the black connectors on the right side. https://speedysignals.com/wp-content/uploads/2013/08/2014-10-27_23_44_31.jpg2014-10-27_23_44_31Populated PCB. Solder the transistors BACKWARDS to the silkscreen! https://speedysignals.com/wp-content/uploads/2013/08/stairs-state-machine-2-new-page.pngStairs State Machine 2 - New Pagehttps://speedysignals.com/wp-content/uploads/2013/08/screen-shot-2014-03-12-at-1-48-39-am.pngScreen-Shot-2014-03-12-at-1.48.39-AMhttps://speedysignals.com/wp-content/uploads/2013/07/screen-shot-2013-07-29-at-1-21-40-pm.pngScreen Shot 2013-07-29 at 1.21.40 PM2023-03-17T20:51:26+00:00monthlyhttps://speedysignals.com/2018/07/22/stairs-lights-kit-is-ready-to-be-commercialized/https://speedysignals.com/wp-content/uploads/2018/07/20180617_220246.jpg20180617_2202462022-04-08T06:09:34+00:00monthlyhttps://speedysignals.com/2014/03/26/bike-lights-design/https://speedysignals.com/wp-content/uploads/2014/03/2014-03-30-22-52-02.jpg2014-03-30 22.52.02Idle Mode - Fadinghttps://speedysignals.com/wp-content/uploads/2014/03/2014-04-14-11-30-56.jpg2014-04-14 11.30.56Mutilated copper ringhttps://speedysignals.com/wp-content/uploads/2014/03/2014-04-14-11-33-21.jpg2014-04-14 11.33.21https://speedysignals.com/wp-content/uploads/2014/03/ringseperation1.pngringSeperationLED rings separated very far from wheel. Image courtesy of Revolights. https://speedysignals.com/wp-content/uploads/2014/03/ringseperation.pngringSeperationLED rings separated very far from wheel. Image courtesy of Revolights. https://speedysignals.com/wp-content/uploads/2014/03/controlboardflipped.jpgcontrolboardflippedControl board with artwork flipped and soldered. The components are on the other side. https://speedysignals.com/wp-content/uploads/2014/03/wiretie.jpgwiretieMetallic wire tie. Bad. https://speedysignals.com/wp-content/uploads/2014/03/wrongpolarity.pngwrongPolarityhttps://speedysignals.com/wp-content/uploads/2014/03/shortedtrace.jpgshortedTraceShorted trace at top of board. I witnessed the magic smoke come from my Arduino. https://speedysignals.com/wp-content/uploads/2014/03/controlboardeagle.pngcontrolboardeagleRouted board in EAGLE2019-01-10T01:28:44+00:00monthlyhttps://speedysignals.com/2017/06/17/my-entry-in-the-starcraft-2-rock-the-cabinet-contest/https://speedysignals.com/wp-content/uploads/2017/06/newmap.pngnew Starcraft MapNew map with six entrances (4 on the left, 2 on the right) Keystone is in the center of the action. All three void shards are reachable and enemies spawn on the left. https://speedysignals.com/wp-content/uploads/2017/06/oldmap.pngOld Starcraft MapOld map with 2-3 entrances where enemies came from the righthttps://speedysignals.com/wp-content/uploads/2017/06/screen-shot-2017-06-07-at-14-18-07.pngScreen Shot 2017-06-07 at 14.18.07List of submitted missions2017-06-18T04:57:12+00:00monthlyhttps://speedysignals.com/2012/11/22/arduino-based-point-of-sales-system/https://speedysignals.com/wp-content/uploads/2012/11/registerstatediagramarduino.pngRegisterStateDiagramArduinohttps://speedysignals.com/wp-content/uploads/2012/11/schematic.pngschematichttps://speedysignals.com/wp-content/uploads/2012/11/rtcandlevelconverter.jpgRTCandLevelconverterRTC used to keep track of time https://speedysignals.com/wp-content/uploads/2012/11/receipt2.jpgreceipt2When the printer did not jam, it produced crisp black graphics and easy-to-read text. https://speedysignals.com/wp-content/uploads/2012/11/receipt1.jpgreceipt1https://speedysignals.com/wp-content/uploads/2012/11/ps2-jack.jpgPS2-jackPS/2 breakout used for the keyboard. Notice the wirewrap job used to replace the broken header underneath. https://speedysignals.com/wp-content/uploads/2012/11/printer.jpgprinterAdafruit Thermal Receipt Printer with 7.4V 850 mAh 20C battery for power source. https://speedysignals.com/wp-content/uploads/2012/11/overview2.jpgoverview2https://speedysignals.com/wp-content/uploads/2012/11/overview1.jpgoverview1Full-size Keyboard used for inputhttps://speedysignals.com/wp-content/uploads/2012/11/lcd2.jpglcd22015-06-01T11:36:19+00:00monthlyhttps://speedysignals.com/2013/06/27/how-to-switch-a-transistor/https://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-9-18-25-pm.pngScreen Shot 2013-06-27 at 9.18.25 PMMOSFET Switching LEDhttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-5-36-50-pm.pngScreen Shot 2013-06-27 at 5.36.50 PMThreshold Voltagehttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-5-28-20-pm.pngScreen Shot 2013-06-27 at 5.28.20 PMDrain current vs Vds curvehttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-4-42-50-pm.pngScreen Shot 2013-06-27 at 4.42.50 PMhttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-4-15-51-pm.pngScreen Shot 2013-06-27 at 4.15.51 PMAND Gateshttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-4-11-34-pm.pngScreen Shot 2013-06-27 at 4.11.34 PMOR Gateshttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-3-48-27-pm.pngScreen Shot 2013-06-27 at 3.48.27 PMRelayhttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-3-47-54-pm.pngScreen Shot 2013-06-27 at 3.47.54 PMBJThttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-27-at-3-46-28-pm.pngScreen Shot 2013-06-27 at 3.46.28 PMMOSFEThttps://speedysignals.com/wp-content/uploads/2013/06/screen-shot-2013-06-26-at-2-48-32-am.pngScreen Shot 2013-06-26 at 2.48.32 AMCMOS XOR2015-06-01T11:36:10+00:00monthlyhttps://speedysignals.com/2014/05/26/electronic-door-lock-evolution/https://speedysignals.com/wp-content/uploads/2014/02/2014-02-15-16-32-00.jpg2014-02-15-16.32.00Old internet gateway with Arduino receiving X10 commands and sending HTTP GET with ENCJ260. This was REALLY hard to program and required a hosting service. https://speedysignals.com/wp-content/uploads/2014/02/schematic.pngschematichttps://speedysignals.com/wp-content/uploads/2014/02/frontend.pngfrontendDynamic front-end with zoomable timeline and some light styling. I used divs, not tables!https://speedysignals.com/wp-content/uploads/2013/09/dscf0356.jpgDSCF0356Much better enclosed relay module and soldered connection board. Also uses ethernet wire instead of ribbon cable. https://speedysignals.com/wp-content/uploads/2013/09/dscf9725.jpgDSCF9725Wonderful dangling relay module. Very reliable. https://speedysignals.com/wp-content/uploads/2013/09/img_5583.jpgIMG_5583The PCB inside the door lock, featuring four magic ICs. I probably lost power at this stage. https://speedysignals.com/wp-content/uploads/2013/09/img_5576.jpgIMG_5576Disassembling the door lock to tie the string. https://speedysignals.com/wp-content/uploads/2013/09/2013-09-16-14-09-59.jpg2013-09-16-14.09.59Parallax reader and awkward shaped tags. You have to present the V and C tags in the right order to unlock the door! Fun!https://speedysignals.com/wp-content/uploads/2013/09/screen-shot-2013-09-16-at-3-29-06-pm.pngScreen-Shot-2013-09-16-at-3.29.06-PMElectric Imp planner view. There are two OutputPorts, three green boxes for each. https://speedysignals.com/wp-content/uploads/2013/09/img_10511.jpgIMG_1051Left: remote. Middle: Battery. Right: disassembled with wires soldered to it. 2023-02-27T11:29:37+00:00monthlyhttps://speedysignals.com/2015/05/28/the-ten-commandments-of-bitcoin/https://speedysignals.com/wp-content/uploads/2015/05/tablets.pngtablets2015-05-29T20:37:04+00:00monthlyhttps://speedysignals.com/2014/10/15/how-to-hold-a-provably-fair-facebook-contest/https://speedysignals.com/wp-content/uploads/2014/10/screen-shot-2014-10-12-at-23-28-23.pngScreen Shot 2014-10-12 at 23.28.232015-03-30T04:28:02+00:00monthlyhttps://speedysignals.com/2012/12/19/android-phone-battery-calculations/https://speedysignals.com/wp-content/uploads/2012/12/batteryphoto1.pngbatteryPhotohttps://speedysignals.com/wp-content/uploads/2012/12/pixelanalysis2.pngpixelAnalysis2The last part of the graph is me charging via USB2015-04-06T03:19:05+00:00monthlyhttps://speedysignals.com/2012/11/23/comparing-pcb-manufacturer-prices-osh-park-circuits-io-itead-studio-and-upverter/https://speedysignals.com/wp-content/uploads/2012/11/comparison.pngcomparisonhttps://speedysignals.com/wp-content/uploads/2012/11/prices11.pngUpfront CostUpfront Costhttps://speedysignals.com/wp-content/uploads/2012/11/prices21.pngActual Cost per boardActual Cost per boardhttps://speedysignals.com/wp-content/uploads/2012/11/prices2.pngUpfront CostUpfront Costhttps://speedysignals.com/wp-content/uploads/2012/11/prices1.pngActual Cost per boardActual Cost per board2016-07-19T09:42:54+00:00monthlyhttps://speedysignals.com/2013/02/25/the-making-of-the-new-cs120b-intro-to-embedded-systems-parts-kit/https://speedysignals.com/wp-content/uploads/2013/02/screen-shot-2013-06-08-at-11-37-10-am.pngScreen Shot 2013-06-08 at 11.37.10 AMhttps://speedysignals.com/wp-content/uploads/2013/02/screen-shot-2013-06-08-at-11-35-55-am.pngScreen Shot 2013-06-08 at 11.35.55 AMhttps://speedysignals.com/wp-content/uploads/2013/02/cs120_dfrobot.jpgcs120_dfrobotDFRobot USB-to-UART. Notice resettable fuse near 2x3 header. https://speedysignals.com/wp-content/uploads/2013/02/cs120_tut_ispadapter4.jpgcs120_tut_ispadapter4Look at how clean this connection is compared to the manual breakout above. https://speedysignals.com/wp-content/uploads/2013/02/ispadapter.pngISPadapterCustom-designed PCB to make ISP wiring easierhttps://speedysignals.com/wp-content/uploads/2013/02/cs120_tut_ledbar2.jpgcs120_tut_ledbar2An entire port of LEDs with two components. With discrete resistors and LEDs, this would have taken sixteen components. https://speedysignals.com/wp-content/uploads/2013/02/cs120_tut_ispadapter3.jpgcs120_tut_ispadapter3In-system programmer manual breakoutshttps://speedysignals.com/wp-content/uploads/2013/02/cs120_kit.jpgcs120_kit2013-06-08T18:38:19+00:00monthlyhttps://speedysignals.com/2012/09/26/rgb-led-ring-assembly/https://speedysignals.com/wp-content/uploads/2012/09/img_0769.jpgIMG_0769Now you can see the 2/255 duty cycle discrete LEDs. https://speedysignals.com/wp-content/uploads/2012/09/img_0766.jpgIMG_0766Finished RGB Ringhttps://speedysignals.com/wp-content/uploads/2012/09/img_0759.jpgIMG_0759PCB with ATmega168 fully soldered and all bridges removedhttps://speedysignals.com/wp-content/uploads/2012/09/img_07541.jpgIMG_0754PCB and 5050 SMD LEDshttps://speedysignals.com/wp-content/uploads/2012/09/img_0754.jpgIMG_0754PCB and 5050 SMD LEDs2013-01-12T18:10:42+00:00monthlyhttps://speedysignals.comdaily1.02023-03-17T20:51:26+00:00