Maintenance and Broken Things

buildscc | 09 Nov 2011 | | maintenance

There are many things which break during projects, by accident, or for no reason what-so-ever. Since functional tools are much preferred to broken ones when people are working on projects the broken things should be fixed, and/or improved. This wiki page can be added to by any and all members of BUILDs and is not limited to broken things, but also any additions we want to make to the infrastructure of BUILDS, for example, infrastructure based projects. Also this page can be used to request changes and report issues.

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Light Speakers

Overview

Light Speakers receive an audio input and toggles a SSR (Solid State Relay) with the “beat”. The light speaker accomplishes this by amplifying the incoming sound, filtering the sound with a bandpass filter for the desired band and then putting the output of the filter through a “peak” detector which will turn on the relay for a longer period of time when something gets through the filter.

Electronics

Schematic and PCB files are available on [https://github.com/cwoodall/LightSpeakers github].

Block Diagram

Buffer

The two audio channels (left and right) need to be isolated from one another before they can be summed together. Using a basic unity gain buffer will do this perfectly. It allows fro the current and voltage changes to be transmitted through the buffer, but for no current to be drawn from the source of the signals.

Amplifier

Band Pass Filter

Peak Detector

Schematic

[[Image:LightspeakersV1Final.jpg|thumb|center|400px|LightSpeaker Rev. A Schematic. Made with EAGLE]]

PCB Layout

[[Image:Lightspeakers_pcbV1Final.jpg|thumb|center|400px|LightSpeaker Rev. A PCB Layout. Made with EAGLE]

Bill of Materials (aka Parts List)

{| | | | | | | | | | |---- |Part |Value |Distributor |Distributor Number |Manufacturer |Manufacturer Number |Unit Price |Qty |Total Price |---- |C1,C8, C9 |10uF Electrolytic |Digikey |P5148-ND | | |0.2 |3 |0.6 |---- |C2 |.01uF 603 |Digikey |490-1512-1-ND | | |0.023 |1 |0.023 |---- |C3 |100uF Electrolytic |Digikey |P5152-ND | | |0.25 |1 |0.25 |---- |C4, C6 |.1uF 603 |Digikey |490-1532-1-ND | | |0.023 |2 |0.046 |---- |C5 |.047uF 603 |Digikey |490-1567-1-ND | | |0.041 |1 |0.041 |---- |D1 |1N4001 |Digikey |1N4001-E3/54GICT-ND |Vishay |1N4001-E3/54 |0.43 |1 |0.43 |---- |IC1 |LM1117 5V Regulator |Digikey |LM1117MPX-5.0CT-ND |National |LM1117MPX-5.0/NOPB |1.16 |1 |1.16 |---- |IC2 |LM324 SOIC14 |Digikey |296-1390-5-ND |TI | |0.31 |1 |0.31 |---- |J1 |Power Jack |Digikey |CP-202A-ND |CUI Inc |PJ-202A |0.092 |1 |0.092 |---- |J2 |Terminal Block (2x) |Digikey |ED1623-ND | | |0.59 |1 |0.59 |---- |JP2 |.1” Headers |stock |stock |stock |stock |0 |1 |0 |---- |JP3 |.1” Headers |stock |stock |stock |stock |0 |1 |0 |---- |LED1 |LED BLUE 603 |Digikey |475-2816-1-ND | | |0.21 |1 |0.21 |---- |LED2 |LED RED 603 |Digikey |475-2816-1-ND | | |0.21 |1 |0.21 |---- |Q1 |2n2222 TO-92 |Digikey |P2N2222AGOS-ND |ON Semiconductor |P2N2222AG |0.36 |1 |0.36 |---- |R1 |150 603 |Digikey |RMCF0603JT150RCT-ND |Stackpole | |0.02 |1 |0.02 |---- |R2, R15 |470 603 |Digikey |RMCF0603JT470RCT-ND |Stackpole | |0.02 |2 |0.04 |---- |R3, R13 |2.2k 603 |Digikey |RMCF0603JT2K20TR-ND |Stackpole | |0.02 |2 |0.04 |---- |R6,R12 |47k 603 |Digikey |RMCF0603JT47K0TR-ND |Stackpole | |0.02 |2 |0.04 |---- |R7 |33k 603 |Digikey |RMCF0603JT33K0TR-ND |Stackpole | |0.02 |1 |0.02 |---- |R8, R9, R14 |100k 603 |Digikey |RMCF0603JT100kTR-ND |Stackpole | |0.02 |3 |0.06 |---- |R10, R11 |1M 603 |Digikey |RMCF0603JT1M00TR-ND |Stackpole | |0.02 |2 |0.04 |---- |S1 |SWITCH-SPSTSMD2 |Digikey |450-1635-ND |TE |SSJ12R04 |0.79 |1 |0.79 |---- |SV1 |.1” Headers Male Right Angle |stock |stock | | |0 |1 |0 |---- |SV2 |.1” Headers Female Right Angle |Digikey |S5439-ND | | |0.65 |1 |0.65 |---- |U$1 |10k Pot 3362U |Digikey |3362U-103LF-ND |Bourns Inc. |3362U-1-103LF |1.05 |1 |1.05 |---- |U1 |SSR S108T02 |Digikey |425-2396-5-ND |Sharp Micro |S108T02F |5.01 |1 |5.01 |---- |U2 |3.5mm Audio Jack |Digikey |CP1-3524NG-ND |CUI Inc |SJ1-3524NG |0.85 |1 |0.85 |---- |F1 |FUSEHOLDER OPEN 5X20MM PC MNT |Digikey |WK0011-ND |Littelfuse Inc |64900001039 |0.38 |1 |0.38 |---- | | | | | | | | | |---- | | | | | | | | | |---- |Total Cost |13.312 | | | | | | | |---- |}

Cost Reductions

Change all Resistors to Stackpole resistors (eg 150 ohm 603 Resistor RMCF0603JT150KCT-ND costs $.02 per instead of $.1 per): Approx Savings $1.04

Change LED1 and LED2 to OSRAM CHIPLED (example LB Q39G-L2N2-35-1 OSRAM Opto Semiconductors Inc 475-2816-1-ND).From $.5 per to $.2 per: Approx Savings: $.6

LM385 -> LM324 (quad opamps with buffering): LM324D Texas Instruments 296-1390-5-ND $.31 : Approx Savings: $.45

Prototyping

Version 004

Semi Complete May 24, with Solid State Relay. BOM coming soon along with PCB board and a finalized schematic. [[Image:Lightspeakers.jpg|thumb|800px|center]]

Version 003

Completed 12 May 2012 [[Image:LightspeakerVersion3.png|thumb|800px|center]] This time the LED is replaced with a relay switch which AC powered lights can be plugged into.

Version 002

Completed 12 May 2012 [[Image:LightspeakerVersion2.png|thumb|800px|center]] This version still only lights up an LED, but it also does a better job of filtering out noise so that the on and off is much crisper.

Version 001

Completed 12 May 2012 [[Image:LightspeakerVersion1.png|thumb|800px|center]] This circuit passes the signal from a audio jack into an LED based on the amplitude of the signal alone. It works. The potentiometer determines how low the bass must be to be let through.

Team

  • Chris Woodall
  • Rusty Shomberg
  • Patrick Ehrlicher
  • Tom

Newer

Musical Stairs Question

Is this a good way for those of us not currently at BU to submit some suggestions to the project? One thing I don’t particularly think is necessary is the output-computer at the top of the stairs. Since we already have an arduino monitoring the status of the infrared receivers, it shouldn’t be too hard to throw some sound output routines in there too.

If it’s a small section of the staircase not too many separate voices would be required, but now that I think about it if there are a lot of voices and you want it to have a really particular voice e.g. a piano (as opposed to a sine wave, or if you’re really trying to keep the project simple, a square wave) then using a computer could greatly simplify the coding end of the project.

Another thing I’m worried about is the computer getting stolen.

If it’s not doing something like displaying a “Men of BUILDS” sexy advertisement calendar then we should probably try to avoid it. And for my own curiosity how precisely do the infrared LEDs/sensors work?

Is it at all focused, or your standard LED? Because if the infrared photons are emitting from it in a spherical manner, and the way the note is “triggered” is by blocking the path with your foot, then you’d have to be reasonably close or the LEDs on other steps would prevent the note from triggering, right?

Or is it more focused than your average LED? - Jenkinsm