Arduino sensors and switches11/24/2023 ![]() ![]() At a later time you can tune the timing with the “Delay Time” potentiometer. Once the LED remains OFF, you can move your hand or anything for that matter, in front of the little dome, and see the LED go ON and OFF.ĭepending on what is moving around, the detectable range should be up to 20 feet or about 6 meters.Īlso keep in mind that the sensor will remain “ON” for a little bit after it detects motion. Place your setup in such a way that there will be no motion and wait until the LED remains OFF. When connecting the battery, the sensor will take up to 30 to 60 seconds to stabilize (warm up). We need to understand a few things before we can tweak the settings. In the beginning you might notice some seemingly erratic behavior – this is perfectly normal. When the LED goes on, motion is detected. Now that we have a test setup, time to do some playing. I made this drawing with Fritzing, a great tool to make electronic design! Playing with the “settings” ![]() Testing your PIR with a Battery, LED and a Resistor PIR PCBĪ few points on the PCB of the PIR are of importance to us: These tiny lenses help the sensor to look “around” in one swoop, which would have been impossible with just the flat sensor (see figure 2). If you look closer, you’ll see that the “dome” is build out of little segments – each being a small plastic Fresnel Lens. ![]() PIR Lens “Dome”Īs you can see in the pictures above, the PIR has some funny dome-like bubble, which is a collection of lenses covering the sensor. This is done in a smart way, to avoid false positives caused for example by a brief flash or an increase in room temperature.Ī chip and some discrete electronics handles all this for you. If the difference is too high then it will trigger – it detects “motion”. PIR’s actually only look at the “difference” between two sensor “halves”. It’s purely based on what the sensor can pick up out of the environment, what’s being emitted by objects. When i try to use the sensors in the loop(), only the sensor initiated last will work.PIRs are called “passive” since they are not assisted by any “helpers” that for example would send some form or shape of “radiation” or “light” to help detect. Serial.println("Waiting for valid finger.") Serial.print("Sensor contains ") Serial.print(finger.templateCount) Serial.println(" templates") Serial.println("Did not find fingerprint sensor :(") Serial.println("Found fingerprint sensor!") finger.begin(9600) // set the data rate for the sensor serial portįinger.begin(57600) // set the data rate for the sensor serial port MiServo.write(door_close_degrees) //Door close Lcd.init() //Init the LCD with i2c communication and print text Serial.println("Please check connection and restart Arduino.") Serial.println("Not find VoiceRecognitionModule.") Serial.println("Elechouse Voice Recognition V3 Module\r\nControl LED sample") *Now we open the new created file, write the data, and close it back*/ Serial.begin(57600) //Start serial communication for fingerprint TX RX data. ![]() VR myVR(2,3) // 2:RX 3:TX, you can choose your favourite pins. #define servo A0 //Pin for the Servo PWM signal Int main_user_ID = 1 //Change this value if you want a different main user Int servo = 11 //Pin for the Servo PWM signal Int green_led = 8 //Extra LEDs for open or close door labels This is the first part of my sketch where the problem is:Īdafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial) (both will be initiated successfully but only one - the last - will cpntinue working. I get them to work individually but the moment i try to combine them, only one works depending on which wwas initiated last. I coundnt get a fingerprint sensor (AS608) and voice recognition module (elechouse v3 voice recognition module) to work together on the same arduino nano. ![]()
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