Hi Rob,
If you plan to use OUT pin for pwm, a *pullup against +5v* is recommended.
Other pwm don't need external pull up/down.
You may connect directly the FET gate to the header, tinyboard already have
a 470 ohms resistor between OUT pin and header.
For an inductive load, it is recommended to protect your FET with a free
wheel diode.
Pascal
2010/2/22 Rob Conway <[email protected]>
> Got my board today must say it looks like the picture however a lot
> smaller than I thought. Should be very easy to install into a small case.
>
> Question: For the "PWM" and "OUT" driving a FET.
>
> Can I just connect a FET directly to the output and have a pull down (10k)
> resistor to gnd ?
> I have also seen a recommendation to place a 1k resister between the output
> and the gate of the FET. This is if the FET fails and you end up with Vcc
> directly on the output.
>
> FYI I have purchased some IRF540 N-Mosfets. Plan to test run PWM somewhere
> between 20-160hz as per
> http://www.maxim-ic.com/app-notes/index.mvp/id/1784
> I am only driving a 12V 7W small blower.
>
> rob
>
> -----Original Message-----
> *From:* Rob Conway [mailto:[email protected]]
> *Sent:* Saturday, February 20, 2010 9:14 AM
> *To:* 'OWFS (One-wire file system) discussion and help'
> *Subject:* [Owfs-developers] BAE0910 tinyboards -Preparing to get it up
> andrunning
>
> In preparation to getting this device I understand I have a couple of
> tasks,
>
> 1) Update to the latest owfs so that one is OK. I also assume once I
> connect it via owfs the parameters will be shown via owhttp so that bit
> should be OK. Is there any issue using a 1wire hub ? I have the
> hobbyboards unit.
>
> 2) I was wondering though if you have a guide to the installation of the AE
> compiler and a sample program which can be compiled and loaded through owfs.
> I noticed the source code is on the site. I am using ubuntu.
>
> 3) I have purchased some N channel mosfets which I hope to use 1 for PWM
> (cooling fan) and the other to control my heater relay. For my first
> project, temperature control, I hope to simply get the host to write the
> current temperature and control setpoint to the BAE0910 and let it control
> fan speed and heater.
>
> rob
>
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>
>
> ------------------------------------------------------------------------------
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--
Pascal
www.brain4home.eu
------------------------------------------------------------------------------
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