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TVS diode and electro lock --> EU model

Started by gm April 20, 2016
Hi.

I made one board that is attached to arduino mega.
Board is powered with standard 12V / 1.5A transformer and there are two 
main power supply's. 12V DC and 9V DC. 9V for arduino board and 12v for 
coin sorter.

Keypad and lcd are connected directly to arduino pins.

When user enters right code configuration, door opens.
Relay is standard 12V / 10A AC relay and one pin of relay is connected 
over resistor to arduino pin and other part directly to transformer.

Basically everything is working as it should but it looks like that the 
diode that is hooked up to relay, isn't filtering enough. Almost each 
time, when the lock is opened, display ( connected directly to arduino ) 
start to flicker. The lock is pulling 1A.

One college has suggested to set one TVS diode in parallel with lock to 
solve this problem. Any suggestion what kind of tvs diode should i use 
in this design and will this work with AC relay ?

Regards !

In article <nf7ch6$p86$1@l01news1.ot.hr>, gm <notMyMail@mail.not> 
wrote:

> Hi. > > I made one board that is attached to arduino mega. > Board is powered with standard 12V / 1.5A transformer and there are two > main power supply's. 12V DC and 9V DC. 9V for arduino board and 12v for > coin sorter. > > Keypad and lcd are connected directly to arduino pins. > > When user enters right code configuration, door opens. > Relay is standard 12V / 10A AC relay and one pin of relay is connected > over resistor to arduino pin and other part directly to transformer. > > Basically everything is working as it should but it looks like that the > diode that is hooked up to relay, isn't filtering enough. Almost each > time, when the lock is opened, display ( connected directly to arduino ) > start to flicker. The lock is pulling 1A. > > One college has suggested to set one TVS diode in parallel with lock to > solve this problem. Any suggestion what kind of tvs diode should i use > in this design and will this work with AC relay ? > > Regards !
1 Amp from an Arduino digital pin to drive a relay? It's rated for 0.02 Amps, right? -- I will not see posts from astraweb, theremailer, dizum, or google because they host Usenet flooders.
On 04/21/2016 08:18 AM, Kevin McMurtrie wrote:
> In article <nf7ch6$p86$1@l01news1.ot.hr>, gm <notMyMail@mail.not> > wrote: > >> Hi. >> >> I made one board that is attached to arduino mega. >> Board is powered with standard 12V / 1.5A transformer and there are two >> main power supply's. 12V DC and 9V DC. 9V for arduino board and 12v for >> coin sorter. >> >> Keypad and lcd are connected directly to arduino pins. >> >> When user enters right code configuration, door opens. >> Relay is standard 12V / 10A AC relay and one pin of relay is connected >> over resistor to arduino pin and other part directly to transformer. >> >> Basically everything is working as it should but it looks like that the >> diode that is hooked up to relay, isn't filtering enough. Almost each >> time, when the lock is opened, display ( connected directly to arduino ) >> start to flicker. The lock is pulling 1A. >> >> One college has suggested to set one TVS diode in parallel with lock to >> solve this problem. Any suggestion what kind of tvs diode should i use >> in this design and will this work with AC relay ? >> >> Regards ! > > 1 Amp from an Arduino digital pin to drive a relay? It's rated for 0.02 > Amps, right? >
Thank you for reply. I should send the schematics, but i can not. No, 1Amp is not going to digital pin. Problem is in self induction but we have solve this with TVS diode. Thnx anyway !