RE: Relay light control problem

["Nicholas Humfrey njh@xxxxxxxxxx [ukha_d]" <ukha_d@xxxxxxxxxxxxxxx>]

Hello,

I am also having problems with a cheap relay board from eBay.

Although my issue is with the Arduino micro-controller crashing from
time to time, I assume due to to Electrostatic Discharge. It all works
fine when there is no load attached.

Can anyone recommend a mid-price board that has higher-quality relays
and/or arcing suppression?



nick.


On 2017-02-13 08:38, 'Simon Coates' simon@xxxxxxx [ukha_d]
wrote:
> Simon,
>
> Itâ??s caused by arcing at the relay contacts since you are
switching
> an inductive load.
>
> Options:
>
> Add bidirectional transient-voltage-suppression across the existing
> relay output to snub the arcing.
>
> Use you GPIO board relay to switch another relay that is inductive
> rated i.e. a small contactor or solid state relay.
>
> Change the fluorescent fittings for ones with high frequency ballasts.
>
> The best solution is probably adding the additional relay.
>
> HTH
>
> Simon
>
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]
> Sent: 13 February 2017 08:14
> To: UK Home Automation List <ukha_d@xxxxxxx>
> Subject: [ukha_d] Relay light control problem
>
> Hi
>
> I've recently been trying to use relays to control the internal lights
> in my garage, but I've been having issues. They are fluorescent tubes,
> two controlled by each relay. The relays are those ones you see all
> over eBay, with GPIO level inputs for control by a Raspberry Pi etc.
>
> The issue I've had is that after a while they simply stick, always on.
> So when the pi sends the signal for them to go off, the lights stay
> on.
>
> I initially thought it was a faulty relay, but I ordered a replacement
> and fitted them on Saturday, and now one side is stuck again.
>
> Is it something to do with the load of these fluorescent tubes? Any
> ideas?
>
> Regards
>
> Simon
>
> ---
>
> "sorrowful, yet always rejoicing; poor, yet making many rich;
having
> nothing, and yet possessing everything" 2 Cor 6:10
>
> [Non-text portions of this message have been removed]
>
>
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Posted by: Nicholas Humfrey <njh@xxxxxxx>
------------------------------------

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