Question about relays to be used with MICROCONTROLLERS

[reaver26]

nag hanap ako kahapon sa net about relays and i had came up with this...

http://www.instructables.com/id/Self_Automated_Plug_In_Appliances/


is it ok i would use:

220V Relay (Look for one with a LOW trigger voltage that matches that of your control source's voltage levels. AKA TTL (5V) for most microcontrollers, RS-232 (~3-12V) for computers' COM port outputs.

Diode (Rated at 120V AC or higher).
TIP120 Transistor
1K-Ohm Resistor


is it ok i will use 6VOLTS trigger relay for my MCU to relay output?

[tiktak]

OK lang, even 12V relay can be used

[reaver26]

OK lang, even 12V relay can be used

MCU input source namin is 9v(10watts)

5volts lang ang MCU output namin.

gagamit po ako relay para using MCU mapa work namin ang electrical devices on 220vAC

ok naba gagamit ako nun 6volts trigger RELAY to run 220vAC?

clarification lang po... bka kasi di mag work if mataas masyado ang relay namin at di kya abutin ng output current namin sa MCU.

[krazeneth]

clarification lang po... bka kasi di mag work if mataas masyado ang relay namin at di kya abutin ng output current namin sa MCU.

lagay ka ng transistor para mag drive ng relay mo. 2m222 pwede na (yan kasi lagi kong gamit).

[marcelino]

Hopefully, you can get from this.



also, be sure that the contact rating is rated to be able to work with 220Vac.

[reaver26]

take a look po sa ginawa ko...

yan po ang setup ng MCU ko....

ok na po ang LED indicator namin... paano ko makakabit ang relay ko sa mcu ko po?

kasi po ang VDD ko wla po ako pwed paglagyan ng wire maliban lang po gawa ako ng bagong wire input connection

on PIN 31


saan ko po kukunin ang ground?

[reaver26]

Update to this topic... ok. na po nakahanap na ako ng 5vdc relay trigger to 250vAC

tnx po sa help... pa delete na lang ng threat na ito... thnx

[reaver26]

RE OPEN THIS THREAD:   tama po ba ang sequence ng circuit ko?

       ( + ) --> RESISTORS --> LED --> TRANSISTOR (2N2222A) -->
MCU                                                                                       RELAY(5VDC) / 250VAC
       ( - ) -->  --> --------------------------------------------->



Tama po ba ang proposed Relay circuit ko?

naguguluhan lang ako... saan ko e connect ang Ground ng TRANSISTOR(2N2222A)?

[nucleus]

RE OPEN THIS THREAD:   tama po ba ang sequence ng circuit ko?

       ( + ) --> RESISTORS --> LED --> TRANSISTOR (2N2222A) -->
MCU                                                                                       RELAY(5VDC) / 250VAC
       ( - ) -->  --> --------------------------------------------->



Tama po ba ang proposed Relay circuit ko?

naguguluhan lang ako... saan ko e connect ang Ground ng TRANSISTOR(2N2222A)?

masisira ang transistor mo wala kang pull down sa base tsaka yung symbol mo ay baligtad PNP yung nasa diagram mo NPN ang 2N2222

[LTSGü]

dapat pointing out po yung emitter arrow..

yung transistor mo pong 2n2222a is an NPN po..

[marcelino]

reaver, why don't you use a schematic capture software... dami naman dyan libre... express pcb would be ok.


ok naman yung schematic mo... but i would recommend this one:


in this case, current for the LED will be pulled from the supply 5V supply rail instead from the MCU pin. note that most MCU I/Os can only source up to 25mA. yung sa schematic mo, ok naman... yun. i am just saying this one is better.

R3 should be replaced if in case you'd use a higher voltage coil rating for the relay.

[nucleus]

reaver, why don't you use a schematic capture software... dami naman dyan libre... express pcb would be ok.


ok naman yung schematic mo... but i would recommend this one:


in this case, current for the LED will be pulled from the supply 5V supply rail instead from the MCU pin. note that most MCU I/Os can only source up to 25mA. yung sa schematic mo, ok naman... yun. i am just saying this one is better.

R3 should be replaced if in case you'd use a higher voltage coil rating for the relay.

ang opinyon ko sa circuit nya, pagkatapos mag logic high at bumalik na sa pagkalogic low ng input magflofloat na yung base na magreresulta sa paginit ng transistor dahil sa dahan dahang pagbaba ng base bias, magreresulta din sa pagkasensitive nito sa RF noise.

[marcelino]

ang opinyon ko sa circuit nya, pagkatapos mag logic high at bumalik na sa pagkalogic low ng input magflofloat na yung base na magreresulta sa paginit ng transistor dahil sa dahan dahang pagbaba ng base bias, magreresulta din sa pagkasensitive nito sa RF noise.

natest ko na yan sir na walang pull down... pero sa high speed, parang di nga magwowork. baka magresult nga sa floating. dapat may pull-down talga.
just to be safe lagyan nalang... isang resistor lang naman yan.

[nucleus]

natest ko na yan sir na walang pull down... pero sa high speed, parang di nga magwowork. baka magresult nga sa floating. dapat may pull-down talga.
just to be safe lagyan nalang... isang resistor lang naman yan.

paalala ko lang sir sa circuit nya may nakaseries na LED

[nucleus]

masyadong sensitive din ang 2N2222

yung circuit nyo sir, * may 10k pull down try nyong hawakan yung 1k resistor magooscillate yung relay

pano pa kaya yung wala

[reaver26]

masyadong sensitive din ang 2N2222

yung circuit nyo sir, * may 10k pull down try nyong hawakan yung 1k resistor magooscillate yung relay

pano pa kaya yung wala

yung circuit diagram ni sir marcellino ok na po ba yun? kasi gagawin ko na po mamaya... i will make 2 relay circuits

outputs are:
1. BUZZER (220VAC)
2. LIGHT BULB (220VAC)

other outputs are:
1. 12VDC Frame Solenoid Lock "PULL ACTION"
http://www.guardian-electric.com/pdf/28L_DC_FrameLatchingSolenoids.pdf
ask lang ako sir. will this work as our door lock for miniature setup?
opinions please.

2. 5VDC DOOR Security ALARM ()


pa tulong narin po sa circuit ko sa VDC outputs ko po... tnx

all i have are ideas about the flow pero as you have seen sa circuit diagram ko my FLAWS...

[reaver26]

natest ko na yan sir na walang pull down... pero sa high speed, parang di nga magwowork. baka magresult nga sa floating. dapat may pull-down talga.
just to be safe lagyan nalang... isang resistor lang naman yan.

clarification sir sa sinabi mong

just to be safe lagyan nalang... isang resistor lang naman yan.

anong resistor ang tinutukoy mo sir?

tnx

[rdpzycho]

'yung 10k resistor na from base to emitter (ground) para may hihila sa base to ground kapag walang pumapasok sa input.

[reaver26]

'yung 10k resistor na from base to emitter (ground) para may hihila sa base to ground kapag walang pumapasok sa input.

circuit diagram that sir marcellino posted wala na ako babaguhin po dun? tama po ba sir rdpzycho?

[reaver26]

Pa tulong narin po sa circuit ko sa VDC outputs ko po...

outputs are:
1. 12VDC Frame Solenoid "PULL ACTION" gagamitin ko po as LOCKING MECHANISM
http://www.guardian-electric.com/pdf/28L_DC_FrameLatchingSolenoids.pdf
     ask lang ako sir. will this work as our door lock for miniature setup?
     opinions please.

2. 5VDC DOOR Security ALARM

all i have are ideas about the flow pero as you have seen sa circuit diagram ko my FLAWS...