Ping ultrasonic range finder the sen136b5b is an ultrasonic range finder from seeedstudio it detects the distance of the closest object in front of the sensor from 3 cm up to 400 cm it works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The sensor outputs a muted sound wave out of its speaker one of the silver barrels that will bounce off an object and be reflected back to the sensors microphone the other silver barrel after the sound wave is sent out the sensor will time how long it takes for the reflected sound to get back to the ultrasonic sensor. The electrical wiring diagram for an actual ultrasonic sensor to an arduino if you are using a 4 pin ultrasonic sensor the normally closed pin nc is wired to ground you can place the ultrasonic sensor as shown on the breadboard and with jumper wires complete the wiring to the arduino. The schematic and wiring diagram below show the schematic and wiring diagram of a circuit very similar to the ones in streetlights that turn on automatically at night the circuit outputs a voltage that varies depending on how much light shines on the phototransistor the arduino will monitor the voltage level with one of its analog input pins. Please see our project interface a 16x2 character lcd to learn how to connect the lcd to an arduino uno you should have pins 4 6 and 11 14 of the lcd connected to uno pins 2 3 and 4 7 respectively a timing diagram of the sensor is shown below remember how we had to switch the pin mode from output to input for the parallax
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