electronics 4 (electronics design)

[ahlburuto]

another 1 wahhhh

energy is to saved in a large museum by automatically turning the lights ON and OFF in an infrequently visited museum. Design an electronic circuit that will turn the lights ON when the first person enters and turns the light OFF when the last person leaves the room. The electronic  system should be able to accomodate up to 99 people in the room at any time. The entrance sensor and the exit sensor each consist of parallel light beam. Assume these sensors normally provides a 0 V output , which changes to 5V when the beam is broken. Assume that the entrance is narrow enough to allow 1 person to enter at a time and that the light beam breaks only once per person.


anu daw?

Wala akong alam sa microcontroller eh, pero kung PLC(programmable logic controller) o smart relay yan eh magagawan ko ng schematic yan....

br

[rdpzycho]

sa PLC ako nakagawa niyan. for parking lot. pero dummy hardware lahat.

@grimlock99: pwede yung hardware lang, pero yung requirement na 99 guests to accomodate kailangan ng logic gates.

[grimlock99]

sa PLC ako nakagawa niyan. for parking lot. pero dummy hardware lahat.

@grimlock99: pwede yung hardware lang, pero yung requirement na 99 guests to accomodate kailangan ng logic gates.

hindi kailangan, pwede lang

[bbench]

panu po kung logic gates ang gagamitin at magkaibang pinto ang entrance and exit po?

[grimlock99]

edi parehas lang dalawa pa rin naman sensor mo eh

[bbench]

ahhh i see po cge po try ko gawin bukas unahin ko po iba tinambakan kasi me haysss! 

[bbench]

hello po ulit ung counter nya panu madedetect kung 99 na ung nakapasok at 99 na ang nakalabas? panu magrereset po??

[grimlock99]

yan yung naisip ko pede lagyan ng pang bwas yan

[grimlock99]

bale pang bilang yan kapag gumawa ka ng isang ganyan na mga transistor naman yun ang gagawin mong pangbawas

[RiDdLeR???]

You need at least 2 light sensors each at the entrance and exit so you can detect the direction of entry into the exit/entrance para makasiguro ka na yung pumasok o lumabas ay talagang pumasok o lumabas ng room.  Implementable yan using logic gates but the simplest and easiest way pa rin is to use an mcu.

[rdpzycho]

kung plain logic, kailangan mo ng D flip flops (74HC74) tapos up/down counter (74HC193). yung D flip flops would indicate direction (entry or exit). tapos dependent sa output nung D, redirected sa up/down input nung counter. baka kailangan mo rin ng monostable for validation. kung isang sensor lang yung nag-trigger, reset niya yung direction sensor (D flip flop) para walang false direction trigger.

[rdpzycho]

kulang pa pala ng NAND na mag-off ng relay or thyristor kung 0 ang output ng counter.

[bbench]

ahhh salamat po gagawin ko na eh pagkabitkabitin ang mga cnabi nyo jejeje di kaya ako maguluhan wow thnx po ng madami sa lahat ng ng reply! till nxt time po 

[rdpzycho]

kaya mo yan. ang naaalala ko lang reference ko sa mga ganyan is yung book ni Mano. nakalimutan ko title nun. hehehe.

[bbench]

yan yung naisip ko pede lagyan ng pang bwas yan

anu pong klase ito??? counter ba ito???

[grimlock99]

anu pong klase ito??? counter ba ito???

opo counter po iyan gamit ang scr