An Ultrasonic sensor detect an object within its range, 4Duino-24 will then send a message to the thingSpeak which will update the twitter if someone is present in front of your device. Then the uCAM-III will capture the image and store it on the SD Card so that the image can be retrieved as an evidence.An Ultrasonic sensor detect an object within its range, 4Duino-24 will then send a message to the thingSpeak which will update the twitter if someone is present in front of your device. Then the uCAM-III will capture the image and store it on the SD Card so that the image can be retrieved as an evidence. Read more...