Security camera project using 3G/GPRS/GSM shield

Projects Programming
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I would like to build the following project, to make a security camera to email photos via GSM. However, I need to add a PIR sensor (HC-SR501), so that photos are only emailed when motion is detected.

https://create.arduino.cc/projecthub/ASimon/email-3g-gprs-camera-72c3da

Is anyone please able to confirm if there are likely to be any compatibility issues with doing this? The PIR requires a free PWM digital input pin (i.e. pin 2), and just want to check that the 3G/GPRS/GSM shield will leave some of these input pins free.

Also, I have had memory warnings with a previous Uno project (which has less code/variables/etc than the above). Is there an Arduino board that has more memory than the Uno that might be more suitable board for this project?

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The PIR requires a free PWM digital input pin

RUBBISH!

just want to check that the 3G/GPRS/GSM shield will leave some of these input pins free

From what I can see - yes, or no!

Also, I have had memory warnings with a previous Uno project (which has less code/variables/etc than the above). Is there an Arduino board that has more memory than the Uno that might be more suitable board for this project?

Yes, the MEGA 2560 does, or their are Arduino compatable boards like the teensy range.

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