[TriEmbed] One final question regarding my solenoid project

Scott Hall scottghall1 at gmail.com
Sun Nov 3 16:10:22 CST 2013

Excellent catch for newby.  It is by no means the only way to approach the
problem, but a very effective one.

The 2mA draw of the LED in the optoisolator is well within the GPIO pin specs of
the Raspberry Pi.

However make sure that you use a separate 5V supply to power the relay board,
but you can power the opto- LED from the R'Pi's 3.3V power if you use a 470ohm
resister (R1) instead and forgo the extra LED (IN1), or use a 120ohm resister if
you keep the extra LED.

On 11/03/2013 08:53 AM, Lucas Rumney wrote:
> I am sorry to email the group yet again for the same project, but I have been
> doing research and I wanted to know if there would be any issues with using
> these parts together, and if they could be put together into a circuit that
> would actually protect the pi, and control the solenoid with the pi (I am a
> real noob at this, but I don't intend to be for long)?
> would this optoisolated relay board cover all of the parts I need, and be in
> the correct range (safe fore the raspberry pi, and also usable with the
> solenoid linked later in the email?)
> http://yourduino.com/sunshop2/index.php?l=product_detail&p=218
> solenoid: 
> http://www.adafruit.com/products/413#Technical_Details
> I have read up on the relay board, but I don't understand all of the stats,
> and I dont want an imcompatability to ruin my pi. 
> Thank you guys for being so helpful, I've been trying to get this done in
> between work and school. 
> Lucas 
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Scott G. Hall
Raleigh, NC, USA
ScottGHall1 at GMail.Com

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