92261705 EPICS Project Detail Design Report

8/13/2019 92261705 EPICS Project Detail Design Report

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Project Detail Design Report:

Traffic Directing Light

SystemLafayette School Corporation

Mr. Roger Francis (Project Partner Liaison)

Ste e !alaf"tTra is L"t#

Ryan Schec$elhoff Craig %oranRo& Fis$e


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Overview of Design:

Basic Components: Traffic Light: The traffic light is compose& of fo"r faces inten&e& for "se at a fo"r

'ay intersection. ach face is compose& of t'o sets of lights: an *+ for stop an& t'oconnecte& arro's pointing in the for'ar& an& right &irections (no left t"rns for thisintersection). The lighting is a set of L Ds, re& for the * an& green for the arro's.

o The fo"r faces are interface& -y a microcontroller 'hich controls 'hether the *or arro's are lit on each face at a certain time. The lights are ens"re& not toha e t'o &irections crossing the intersection at the same time.

o The po'er for the L Ds is &epen&ent on po'er from the microcontrollerthro"gh amplifiers. ach set of *+s an& arro's are po'ere& thro"gh a &ifferentamplifier &"e to the presence of a resistor in the green L Ds. The amplifier iscompose& of a stan&ar& /0+ op amp.

o The inp"t to the &e ice is the logic of 0+ or 1+ from the microcontroller an&

appro2imately 3 olts. The o"tp"t is either a lit L D or a non4lit L D. Microcontrollers (Transmitting an& Recei ing): The CP5 of the system is a

set of 3 microcontrollers. 6ne microcontroller is locate& in the traffic light, the other isin the control -o2. The controller in the control -o2 'ill sen& a signal to the trafficlight ena-ling it to p"t forth the proper light arrangement on the light faces. The

programming flo' charts are attache& to the report.o The microcontrollers are &epen&ent on a 78 po'er so"rce 'hich 'ill come "p

from the city+s po'er gri& 'hich has -een confirme& as a 0318 9C signal. 9n9C DC con erter 'ill -e implemente& to a&j"st the oltage to operate thetraffic light properly. The microcontroller 'ill release a 8 DC signal fromeach o"tp"t that 'ill inp"t into the amplifier to -e properly a&j"ste& to po'erthe ario"s L D light faces.

o The inp"t to the transmitting microcontroller 'ill -e a signal from the p"sh-"tton of the control interface. The o"tp"t 'ill -e a logic signaltransmitte& to the RF transmitter for &eli ery to the RF Recei er. The inp"t tothe recei ing microcontroller 'ill -e the logic signal transferre& from the RF setan& the o"tp"t 'ill -e the logic arrangement for the ; face of the traffic lightinto the amplifier.

RF (Ra&io Fre


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the antenna an& the microcontroller from 'hich is sen&s the logic to theRecei er in the traffic light.

o The inp"t to the transmitter is the logic signal from the microcontroller. Theo"tp"t is a ra&io fre


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locate& o"t&oors. Proper protection of the traffic light 'ill -e necessary so as to a oi&&amage &"e to rain, sno', high temperat"res, an& other e2treme 'eather con&itions.=hile o"r prototype mo&el 'ill not incl"&e any of these protecti e components,s"ggestions an& &esign specifications 'ill -e presente& to the project partner.

Et ical: The traffic light system is a -enefit to the comm"nity an& a safety

implementation for the proper protection of st"&ent pe&estrians an& &ri ers. thicallythere are no specifications nee&e& to ens"re this consi&eration. !ealt and Safet": There is a set of fe&eral re.html

Social: The traffic light m"st ha e a -eneficial effect on the traffic flo' of the schoolarea rather than impe&e the traffic f"rther in any 'ay. Therefore the &esignspecifications m"st -e set "p to efficiently &irect the flo' of traffic.

Sustainabilit": Certain components 'ere inserte& into the &esign of the traffic light to pre ent from reg"lar maintenance iss"es. %ere is a list of these components:

o Crowbar: Pre ents casca&e fail"re in a parallel circ"it. An the e ent thatc"rrent -ecomes impe&e& any'here in the L D circ"it a cro'-ar 'ill ens"rethat c"rrent 'ill contin"e to flo' thro"gho"t the rest of the light signal o"tsi&eof the affecte& area.

o #ine Driver: Linear 9mplifier that -oosts c"rrent, "se& in applications 'herethe original so"rce &oesn t ha e eno"gh c"rrent. 5se& 'hen there are long lea&lengths ' too m"ch resisti e loss thro"gh the lines so s"fficient c"rrent isnee&e&. This &e ice 'ill -e implemente& 'ith the amplifier to ens"re po'er iss"staine& from the microcontroller to the L D light faces.

$est etics: The appearance of the traffic light is an important characteristic to thetraffic light. =e ma&e s"re a proper colore& perf -oar& 'as "se& so as to ma$e theL Ds clearly ie'a-le an& not impe&e the clearness of color on the traffic faces.

orilla l"e 'as "se& to attach t'o perf -oar&s together to create the proper si#e&traffic face. Some of the gl"e seeme& o"t onto the traffic face an& ha& to -e file& &o'nto remain in isi-le. =e generally 'ant a goo& loo$ing project so as appear organi#e&in o"r &esign an& pro&"ction of the system to gain the Corporation+s appro al.

Comparison of Pro%ect to Specifications:
http://www.in.gov/legislative/ic/code/title9/ar21/ch3.htmlhttp://www.in.gov/legislative/ic/code/title9/ar21/ch3.html


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Similarities:o The traffic light 'ill still -e error proofe& so as not to ha e t'o &irections

crossing o er the intersection at the same time. This is to a oi& acci&ents an&"phol& safety.

o Control @o2 'ill still -e $ept in the principal+s office "sing p"sh -"tton controlfor easy "se -y a staff mem-er.

o The pro&"ct 'ill still -e aesthetically &esigne& to catch the attention of allmotorists an& pe&estrians. At m"st -e large eno"gh in si#e an& the L D lightingm"st -e -right eno"gh for isi-ility.

o Different traffic sche&"les 'ill -e programme& into the TransmittingMicrocontroller to allo' "se at &ifferent times of the &ay as 'ell as speciale ents.

Differences:o 9n operator in the principal+s office 'ill no longer ha e a camera ie' of the

intersection controlle& -y the traffic light. Traffic sit"ations 'ill -e relaye& -ystaff 'or$ers to the office operator so as to man"ally operate the traffic light'hen necessary.

o There is no longer a left arro' on the traffic light &"e to the specification thatthe intersection 'ill ha e a no left t"rn policy implemente&.

o =e ha e &iscar&e& to possi-ility of solar po'ering -eca"se 'e 'ill only -eco ering traffic at t'o locations 'ith t'o traffic lights. The traffic lights 'illha e no nee& for mo-ility therein no nee& for solar paneling.

o =e 'ill no longer -e implementing a shiel& for protection of the traffic light -eca"se this mo&el is only a prototype an& 'ill not act"ally -e a& ance& into pro&"ction for act"al "se.

o The light 'ill no longer -e re ie'e& to ens"re safety stan&ar&s "phel&. =hile'e 'ill present all the safety re

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92261705 EPICS Project Detail Design Report