John your feedback is always uesefull how refreshing
From: John Syne <[email protected]>
To: [email protected]
Sent: Thursday, August 25, 2016 12:51 AM
Subject: Re: [beagleboard] Newbie how to turn a SPDT Relay(30A) on and off
connected to a beaglebone green
On Aug 24, 2016, at 7:24 PM, Przemek Klosowski <[email protected]>
wrote:
On Tue, Aug 23, 2016 at 5:18 AM, <[email protected]> wrote:
When I got my new bbgw I ran an internet search to find how to use the relay
and did not find an easy answer, so here goes:
1. The Grove - SPDT Relay(30A) - uses +5V , so you need to solder the third pin
of that groove connector. Disconnect it from the board, and connect it to the
input 5v power.
It seems that your relay requires nominal 5V coil voltage and 185mA coil
current. This is far beyond what a BBB pin can provide: they put out 3.3V and
barely above 10mA. Additionally, switching the coil on and off generates
inductive spikes that are likely to damage the BBB output circuits. You need
some sort of coil driver; I suggest buying something, e.g one of
http://blog.machinekit.io/p/hardware-capes.html, or building your own circuit
like this one http://i.stack.imgur.com/OhY9d.png
This image is incomplete. You still need a diode across the relay coil or the
transistor collector will see a much higher potential than the supply rail.
Regards,John
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