Double click on DIO 0 which you just added.Select DIO 0 (Digital Input/Output Channel 0).Create a 1 ms pulse separated by 49 ms with an embedded 40 kHz signal by following these steps:.Open "Patterns" on the digital side of the main Analog Discovery window.Place the Texas Instruments SN74ATC08 AND gate on your breadboard and connect pin 7 to ground and pin 14 to 5 V.The steps required to create this signal are outlined below: You are now ready to create the transmitted signal. Procedure 2: The Signal to be Transmitted You will need to interpret (with data) what is happening at each stage of your circuit, for both the transmitter and receiver. We will provide you with both the transmit circuit where the signal is created using the digital pins on the Analog Discovery, and the receiver circuit using Op-Amp filters/amplifiers. Add any necessary constants to your model in order to make it more accurate.Īs described above, you will build two circuit systems, one for the transmitter and one for the receiver. Create a graph showing distance as a function of time (the slope will be the speed of sound). CALIBRATE YOUR SENSOR - Since you can now measure the time difference between the transmitted and received acoustic signals, and you know the speed of sound, you can now determine the distance between your sensor and target.EXTRACT THE TIME BETWEEN THE TRANSMITTED AND RECEIVED SIGNALS - Once you process the return signal so that you can detect it using your Analog Discovery, you will be able to measure the time between the transmitted signal (with Channel 1) and the return signal (with Channel 2.).This signal will be the input to your circuit which will need to filter and amplify your signal.
CREATE A CIRCUIT TO PROCESS THE RETURN SIGNAL - The second transducer will act as the receiver and will find the reflected acoustic signal.The transmitter will send out this signal. You need to connect this signal to one of the transducers, which has an operating frequency of 40 kHz. CREATE A SIGNAL TO TRANSMIT - Create a short pulse, 1 ms long with a frequency of 40 kHz, using the Texas Instruments SN74ATC08 AND gate.To design the sensor you will need to complete the following steps: You will use the signal coming into the receiver as the input signal to your circuit. In this lab you will design and build an ultrasonic distance sensor using two identical transducers, one will serve as the transmitter, and one as the receiver. Image 2: Schematic of Texas Instruments AND gate SN74ATC08
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