Handmade Ultrasonic Sensor Circuit (JLCPCB)

In this article, we’ll teach you making a handmade ultrasonic sensor circuit. It is a very useful and interesting project circuit. The sensor circuit can trace any kind of movement in front of this and at the same the buzzer can make sound to alert you. The sound will be louder, when the subject become closer to the sensor circuit. The best facility of this circuit is that, this circuit can be operated using only DC 3.7 volt. That means, this will safe electric energy.

The article is being published in collaboration with JLCPCB. They supply high quality PCBs at a very reasonable price. They also can provide SMT circuit assembly.

We thanks to our sponsor JLCPCB for sponsoring us PCBs for this project circuit.

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Thanks To JLCPCB.

$2 for 1-4 Layer PCBs.

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For making this useful project circuit, we might need some simple electronics component. You also can order assembled PCBs form JLCPCB. JLCPCB have its parts library. To check JLCPCB parts library, click here.

All Component list have to been given below –

Component List –

• Timer IC – NE 555
• Resistor – 1 KΩ
• Capacitor - 10µf/ 50v
• Capacitor - 100µf/ 25v
• Potentiometer - 20 KΩ
• Power Source - 3.7v
• Ultrasonic Sensor Circuit

NE555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation and oscillator applications. Derivatives provide two or four timing circuits in one package. There are totally 8 legs of a timer IC.

As well as the 555 timer, there is also available the NE556 timer oscillator.

The internal block diagram and schematic of the 555 timer are highlighted with the same color across all three drawings to clarify, how the chip is implemented.

Its 8 legs Pin Out can be seen above.

1. GND - The ground pin connects the 555 timer to the negative (0v) supply rail.

2. TRIG - The negative input to comparator No 1. A negative pulse on this pin “sets” the internal Flip-flop when the voltage drops below 1/3Vcc causing the output to switch from a “LOW” to a “HIGH” state.

3. OUT - The output pin can drive any TTL circuit and is capable of sourcing or sinking up to 200mA of current at an output voltage equal to approximately Vcc – 1.5V so small speakers, LEDs or motors can be connected directly to the output.

4. RESET - This pin is used to “reset” the internal Flip-flop controlling the state of the output, pin 3. This is an active-low input and is generally connected to a logic “1” level when not used to prevent any unwanted resetting of the output.

5. CONT - This pin controls the timing of the 555 by overriding the 2/3Vcc level of the voltage divider network. By applying a voltage to this pin the width of the output signal can be varied independently of the RC timing network. When not used it is connected to ground via a 10nF capacitor to eliminate any noise.

6. THRES - The positive input to comparator No 2. This pin is used to reset the Flip-flop when the voltage applied to it exceeds 2/3Vcc causing the output to switch from “HIGH” to “LOW” state. This pin connects directly to the RC timing circuit.

7. DISCH - The discharge pin is connected directly to the Collector of an internal NPN transistor which is used to “discharge” the timing capacitor to ground when the output at pin 3 switches “LOW”.

8. VCC - This is the power supply pin and for general purpose TTL 555 timers is between 4.5V and 15V.

• Supply voltage: 5V (DC).
• Supply current: 15mA.
• Modulation frequency: 40Hz.
• Output: 0 – 5V (Output high when obstacle detected in range).
• Beam Angle: Max 15 degrees.
• Distance: 2cm – 400cm.
• Accuracy: 0.3cm.
• Communication: Positive TTL pulse.

The schematics of PCBs can be seen above.

To make this circuit, we need to follow a normal method of this time IC. 1st we need to connect 2 and 6 no leg of timer IC-NE555. Then we connect 4 and 8 no leg of NE-555 timer IC. It is a common connection for NE555 IC circuit.

Then we connect 10µf/50v capacitor negative leg with 1no leg of timer IC and connect it’s positive leg with 4no leg of timer IC.

Now we connect 100µf/25v capacitor positive leg with buzzer positive leg and connect capacitor negative leg with buzzer negative leg.

This is a parallel connection between capacitor and buzzer. Then we connect capacitor positive leg with 4no leg of timer IC.

It is the time to connect 1 kΩ resistor with the circuit. We connect this resistor with 6 and 7 no leg of timer IC.

Thanks to JLCPCB, for provide us such a quality PCBs.

This time we need to connect Potentiometer with the circuit. We connect potentiometer Vcc leg with 8no leg of timer IC. And then connect timer IC 7no leg with GND and Output leg.

Now we connect power source with the circuit. We are using DC 3.7v battery with the circuit. Connect battery positive cable with 8no leg of timer IC and connect battery negative cable with 1no leg of timer IC.

This is the final step of this ultrasonic circuit. Now we just need to connect sensor with the circuit.

Follow the steps below -

• Vcc leg with 4no leg of timer IC
• Trig leg with 3no leg of timer IC
• Echo leg with buzzer negative leg
• Gnd leg with 1no leg of timer IC

If you complete design of your PCBs, then it is time to order PCBs. To order best quality PCBs, just visit JLCPCB and click on the “QUOTE NOW” button.

Since 2006, JLCPCB continuously driven to become more efficient and to reduce costs. They promise to offer customers the most economic PCBs forever. JLCPCB makes cheapest but top quality PCBs possibly because of scale effect, extremely high production efficiency and less manpower cost.

You can order minimum 5 pieces PCBs for only $2 costs.

To order PCBs, make your Gerber file. Then drag and drop the Gerber file on the following box.

Click on “Gerber Viewer” button you can check the PCBs design. Make sure everything is good, then choose color, quantity and order your PCBs at very reasonable prices.

If you are a new user, then you can order 10 pieces PCBs, costing only $2. To place your order click on “Save to Cart” button. Confirm your shipping address and shipping method.

To order your SMT PCBs, visit JLCPCB.

• Drag and drop SMT PCBs file on site.
• Choose your PCBs color and quantity.
• To free SMT assembly for your PCB click on “SMT Assembly” button and then confirm.
• Add your BOM file and CPL file.
• Place your order click on “Save to Cart” button.
• Confirm your shipping address and shipping method.
• Pay your payment
• Wait for confirmation mail.

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JLCPCB supported all shipping method can be seen below.

Estimated Delivery Time

• DHL International Express 3-5 business days
• UPS Worldwide Saver 3-6 business days
• S.F Express (Standard) 5-8 business days
• S.F Express (Economy) 8-15 business days
• Singapore EMS 8-15 business days
• Post Link Registered Mail 15-20 business days
• ePacket 15-25 business days
• Registered Air Mail 15-20 business days

JLCPCB supported Payment method.

• PayPal
• Credit/Debit Care
• Prepaid wire transfer

To confirm your order, pay your payment. Then accept PayPal, Credit/Debit Card, and Prepaid Wire Transfer. To manufacture your PCBs, it’ll take about 2 days. DHL will be fastest shipping method to arrive your ordered PCBs at your location.

All PCBs were well packed and quality was really good.

Thanks to JLCPCB for best quality PCBs.