![]() ![]() ![]() ![]() As a beginner Arduino enthusiast, I found that the programming, as well as the hardware requirements for the camera or the weight sensors are well out of my capabilities. I was actually thinking of a camera or weight sensor as those are the obviously better options, but to be perfectly honest, we shifted from another capstone project to this, just recently. The motion need not be continuous, it just needs to be present from time to time (no human can stay completely still for a long time unless asleep, and even sleeping people move from time to time).įor seat occupancy I'd probably be looking at other sensors, such as an FSR to detect when someone is sitting in the seat (i.e. Since we can't verify if the occupant is a human or just a random obstacle, I'd have the PIR sensor ready for verification purposes if there's human motion. I'd set a threshold distance that's optimal for a seat, and whenever an ultrasonic detects something, I'd update the monitoring system in real-time. The ultrasonic senses the distance of something within its range, right? If there's distance, then something is present. Is this correct? If yes, is there a way I can limit the current passing through each sensor around its safe levels? I don't know if I did the math correctly, but I just divided 3 A by 40 sensors which yields 75 mA for each. According to the datasheet, the ultrasonic sensor's operating current is approximately 15 mA, while the PIR needs around 65 mA. If I use a buck converter that outputs a max of 3A, will it be okay on its own (without any current-limiting resistor)? If I need to limit the current, how shall I modify the circuit? The power supply I have provides 20A of current. I will use a 12V to 5V buck converter to achieve the required 5V supply voltage for both the HC-SR04 Ultrasonic Sensor and the HC-SR501 PIR Sensor, but I have a few concerns. I am planning to use a 12V 20A external power supply - as this is the only available supply that I have. If I am not mistaken, the Arduino Mega 2560 R3's built-in power supply cannot handle all 40 sensors together. I am planning on using 20 ultrasonic distance sensors with 20 passive infrared motion sensors on Arduino Mega 2560 R3. ![]()
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