[TriEmbed] Driving a bunch of solenoids (cheaply)

[Shane Trent]

Paul,

Check out this 8 channel chip with the diodes built in. 50 V, 500 mA.

http://www.adafruit.com/products/970

Shane

On Sat, Jul 25, 2015 at 8:13 PM, The MacDougals via TriEmbed <
triembed at triembed.org> wrote:

>  I want to drive 16  solenoids (
> *http://www.sciplus.com/p/12-VDC-SOLENOID-VALVE_49518*
> <http://www.sciplus.com/p/12-VDC-SOLENOID-VALVE_49518>).  They are 12V,
> 100mA devices.  At most 8 will be on at any time.  Assume 100% on time for
> any one device.
>
> I have been using this N mosfet for driving motors for my cat feeder and
> drip irrigation: FQP30N06L
>
> It works for driving the solenoids.  However, being a cheapskate, I am
> wondering if there is something less expensive (FQP30N06L is $0.95 at
> Sparkfun, more at Digikey)?
>
> I will likely be using ATTiny84 to an I/O expander like:
> *http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf*
> <http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf>
>
> I know I will need diodes across the solenoids to suppress the back EMF
> when they turn off.
>
> I was not planning on any opto-isolation.
>
> I will probably be using a lead acid battery to power the solenoids.
>
> Thanks.
>
> ---> Paul
>
>
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-- 
A blog about some of my projects.  http://fettricks.blogspot.com/
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