Hc sr04 timing diagram8/3/2023 So there is no way we could make the HC-SR04 to work as receiver only. Making your HC-SR04 to work as Receiver only:Īs shown in the timing diagram we cannot control the rise of the Echo pin as it is related to trigger pin. So whenever we want to transmit the wave we just have to control the trigger pin of the Transmitter sensor, for which the code is given below. This will initiate the Ultrasonic wave burst. As shown in the timing diagram you have to declare the Trigger pin as output pin and make it stay high for 10 Microseconds. It is pretty much straight forward to make a HC-SR04 to work as transmitter only. Making your HC-SR04 to work as Transmitter only: So the correct timing diagram should be something like this shown below (Sorry for my poor writing skills) Once it transmits the US wave it goes high and stays high until the wave returns back. This means that the Echo pulse does not wait for the US (ultrasonic) wave to be received by it. I covered the Tx (transmitter) part of my sensor and checked if the Echo pulse got high, and yes it does go high. This timing diagram does not seem to be true. Here the timing diagram shows that once the receiver receives the wave it will make the Echo pin go high for a duration of time which is equal to the time taken for the wave to travel from US sensor and reach back to the sensor. This US wave will hit an object bounce back and will be received by the receiver. As soon as this is done the transmitter pin will send 8 sonic burst of US waves. First to initiate measurement we should send an Ultrasonic wave from the transmitter, this can be done by setting the trigger pin high for 10uS. The sensor has two pins Trigger and Echo which is used to measure distance as shown in the timing diagram. The below timing Diagram will help us understand the working. Also check: Arduino Ultrasonic Sensor Interfacingīefore we proceed any further let us understand how the HC-SR04 sensor works. Why should we? More of that will be discussed later, but for now the circuit diagram will be as followsĪs you can see the circuit diagram for both Transmitter and receiver are both identical. During the time of this documentation I did not find anyone getting results as close as mine so I have just shared my views on how I got it to work so that people who are trying this need not re-invent the wheel.Įven though we are going to make one US (Ultrasonic) sensor to work as transmitter and the other as receiver it is mandatory connect all the four pins of the sensors with the Arduino. The technique discussed in this article is not fairly accurate and might not be useful in any real systems without modifications. Finding the distance between two US sensors might sound to be a fairly simple task but I faced few challenges which are discussed in this project. By doing this we can track the location of one transmitter using many ultrasonic receivers this tracking is called triangulation and can be used for automatic docking robots luggage followers and other similar application. We will try calculating the distance between two Ultrasonic sensors that is, we will make one sensor to act as transmitter and the other sensor to act as receiver. But in this article we are going to try something different with these popular HC-SR04 sensors. It has been fairly easy to do this with the Arduino and the code is also pretty simple. Project circuit schematic is shown below.Ultrasonic sensor (HC-SR04) is commonly used to find the distance of an object from one particular point. Interfacing PIC16F877A with HC-SR04 ultrasonic sensor circuit: The range = high level time * velocity (340M/S) / 2. Formula: uS / 58 = centimeters or uS / 148 =inch or: You can calculate the range through the time interval between sending trigger signal and receiving echo signal. The Echo is a distance object that is pulse width and the range in proportion. The timing diagram of the HC-SR04 ultrasonic sensor is shown below.įirst we have to supply the sensor trigger pin with a pulse of 10µs and the sensor will automatically send 8 cycles burst of ultrasound at 40 kHz and raise its echo pin. HC-SR04 ultrasonic sensor timing diagram: The HC-SR04 ultrasonic sensor has 4 pins as shown below where: This sensor module includes ultrasonic transmitter, ultrasonic receiver and control circuit. The HC-SR04 sensor can measure distances form 2 to 400cm with an accuracy of 3mm. The distance to an obstacle can be measured with the low cost ultrasonic sensor HC-SR04 (HC-SR05). Distance measurement using PIC16F877A microcontroller and HC-SR04 ultrasonic sensor
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