Rethink Toronto approached me in the early spring to assist in producing a device that could send an SMS message if you left a pet in a car and the temperature reached a life-threatening threshold. The result was the Dog Collar. The device utilized a thermistor and a cell shield mounted on a microcontroller. The upper and lower temperature thresholds were hard coded into the device in order to trigger the SMS.
Media response to this was strong, and message boards both applauded and hated the need for such a device. The conversation generated definitely raised the profile of the campaign.