[TriEmbed] TriEmbed Digest, Vol 15, Issue 22

[Charles McClelland]

Paul, 

Thank you for covering this important and sometimes vexing topic.  Working through a few interrupt issues now, could you please cover some of these in your talk? 

I am using a hardware interrupt on pin 2 of the Arduino Pro Mini to wake my device from SLEEP_MODE_PWR_DOWN
	- Issue - it seems that only a LOW condition on the interrupt pin will wake the Arduino from this sleep so I have to use an inverter.  Why?
	- Issue - in sleep deeper than SLEEP_MODE_IDLE (the least power saving) - the internal clock stops so I can’t set a timer interrupt.  Right?  
	- I know you don’t want to do a lot in the interrupt service routine.  But, can I increment a variable?  Do I need to initialize this variable differently?
	- I am having problems with including the Sleep.h  library and the Wire.h library in the same sketch.  Not sure if this is interrupt related but unless I use Rambo’s I2C library, the Arduino does not wake from sleep.  (https://github.com/rambo/I2C)

You are probably covering all these points but - hey, you did ask for input .  I look forward to your talk on Monday.

Thanks,

Chip



On Aug 31, 2014, at 1:00 PM, triembed-request at triembed.org wrote:

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> Today's Topics:
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>   1. Interrupts (The MacDougals)
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> Message: 1
> Date: Sat, 30 Aug 2014 15:59:16 -0400
> From: "The MacDougals" <paulmacd at acm.org>
> To: <triembed at triembed.org>
> Subject: [TriEmbed] Interrupts
> Message-ID: <065801cfc48c$e1536c00$a3fa4400$@acm.org>
> Content-Type: text/plain; charset="utf-8"
> 
> I am working on the presentation for Monday, Sept 8 on Interrupts.
> 
> I will cover several situations in which the use of interrupts is a good solution.
> 
> I don?t want to miss any of your favorites.  So, let me know if you have more to add to this list:
> 
> 
> 
> Awake from sleep mode
> 
> Capture brief asynchronous input pulse
> 
> Perform an action at a repetitive frequency (e.g. PWM)
> 
> watchdog interrupt to detect code going off in the weeds
> 
> Rapid response to an input
> 
> 
> 
> 
> 
> ---> Paul
> 
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