mm: m: Mum:
Gravity: Water Pressure Sensor
SKU: SEN0257
Gravity: Analog Water Pressure Sensor SKU: SEN0257
This is a water pressure sensor that adopts DFRobot Gravity 3-pin interface. It supports standard 5V
voltage input and 0.5~4.5V linear voltage output. It is compatible with multiple Arduino controllers.
Coordinate with a DFRobot Gravity IO Expansion Shield, the water pressure sensor can be plugged
into an Arduino board, wiring-free. Put it with a Solenoid Valve , a Water Turbine Generator and
other sensors, you can build a smart water control system. Briefly speaking, this water pressure
sensor is a stethoscope to a water pipe. It will help you to diagnose whether there is water, how
strong the water pressure is. It can be widely applied to smart home control systems (SCS), Internet
of Things (IoT) and device detection.
Signal VCC 6ND
Features
Support water pressure detection of living environmental water systems, such as houses, gardens and
farms.
Support water pressure detection of outdoor environment, such as rivers, lakes and sea.
Support water pressure detection of tanks.
Support liquid level detection in special situation.
Specification
Medium: liquid/gas without corrosion
Wiring: Gravity-3Pin (Signal-VCC-GND)
Pressure Measurement Range: 0~1.6 Mpa
Input Voltage: +5 VDC
Output Voltage: 0.5~4.5 V
Measurement Accuracy: 0.5%~1%FS (0.5%, 0~55°C)
Threadably: G1/4
Adapter: G1/2 to G1/4
Waterproof Level: IP68
Operating Temperature: -20~85°C
Response Time: <2.0 ms
Quiescent Current: 2.8 mA
Normal Operating Pressure: ≤2.0 Mpa
Damaged Pressure: ≥3.0 Mpa
Service Life: ≥10’000’000 times (10 million)
PinOut
PinOut-Water Preessure Sensor
Label
Name
Description
Yellow
Signal(Output:0.5~4.5V)
Analog Signal
Red
VCC(5VDC)
+
Black
GND
-
/ 0 son 1600 Input (Atmosphere Pressure + Tened Pressure) (kPa) The Local AT Pressure is about 100kPa
Input & Output
The monocrystallinesilicon is one interior material of the sensor. When monocrystallinesilicon
material suffers force, it makes an infinitesimal change and an electronic level change of internal
atom structure, which will also lead to a great change in resistivity (Factor H Mutation), so as the
resistance. This physical effect is piezoresistive effect.
Based on the piezoresistive effect, a strain gauge is also a work of IC (integrated circuit) engineering
technology. Its production process contains doping, diffusion and a crystal orientation of the
substrate. A strain gauge makes a Wheatstone Bridge. Taking advantage of elasticity properties of
special silicon material and heterosexual micro-machining the same silicon material in different
directions, then a diffused silicon sensor comes into being. The sensor is force-sensitive and
mechanical-electrical detective.
Equipped with an amplify circuit and other parts in need, enable the circuit to output a standard
signal, the diffused silicon sensor makes a pressure transmitter.
Signal Production Process
Signal Input & Output
WT nomad-10 UNOvaVU) ‘l‘l’l‘l1
Tutorial
In this section, we'll show the basic sensor usage and a simple demo about pressure detector.
Demo: Read Water Pressure Value
Requirements
Hardware
DFRduino UNO R3 (or similar) x 1
Gravity: Analog Water Pressure Sensor
Dupont wires
Software
Arduino IDE (Version requirements: V1.6.+), click to Download Arduino IDE from Arduino®
Connection Diagram(Arduino)
Analog Module Connection Diagram
Sample Code
Read Data by Serial Port.
/************************************************************
Water pressure sensor demo(Computer serial port)
- Obtain the water pressure through the output voltage
of the sensor.
**************************************************************/
/************************************************************
Water Sensor Key Parameter
- Parts No.:KY-3-5
- Sensing range: 0 - 1.6 MPa
- Input Voltage: 5VDC
- Output Voltage: 0.5 - 4.5 VDC
(Linearly corresponding to 0 - 1.6 MPa)
- Accuary: 0.5% - 1% FS
**************************************************************/
/************************************************************
Water Sensor Calibration
The output voltage offset of the sensor is 0.5V (norminal).
However, due to the zero-drifting of the internal circuit, the
no-load output voltage is not exactly 0.5V. Calibration needs to
be carried out as follow.
Calibration: connect the 3 pin wire to the Arduio UNO (VCC, GND and Signal)
without connecting the sensor to the water pipe and run the program
for once. Mark down the LOWEST voltage value through the serial
monitor and revise the "OffSet" value to complete the calibration.
After the calibration the sensor is ready for measuring!
**************************************************************/
const float OffSet = 0.483 ;
float V, P;
void setup()
{
Serial.begin(9600); // open serial port, set the baud rate to 9600 b
ps
Serial.println("/** Water pressure sensor demo **/");
}
void loop()
{
//Connect sensor to Analog 0
V = analogRead(0) * 5.00 / 1024; //Sensor output voltage
P = (V - OffSet) * 400; //Calculate water pressure
Serial.print("Voltage:");
Serial.print(V, 3);
Serial.println("V");
Serial.print(" Pressure:");
Serial.print(P, 1);
Serial.println(" KPa");
Serial.println();
delay(500);
}
Demo: DIY a Simple Water Pressure Detector
Requirements
Hardware
DFRduino UNO R3 (or similar) x 1
DFRobot Gravity IO Expansion Shield x1
Gravity: I2C 16x2 Arduino LCD with RGB Backlight Display
7.4V 2500MA Lithium Battery x1
Dupont wires
Software
Arduino IDE (Version requirements: V1.6.+), click to Download Arduino IDE from Arduino®
Connection Diagram
Water Pressure Detector
Sample Code
Please download the LCD library: DFRobot RGB LCD. How to install Libraries in Arduino IDE
Read Data by LCD1602 Display.
/************************************************************
Water pressure sensor demoB(LCD1602)
- Obtain the water pressure through the output voltage
of the sensor.
**************************************************************/
/************************************************************
Water Sensor Key Parameter
- Parts No.:KY-3-5
- Sensing range: 0 - 1.6 MPa
- Input Voltage: 5VDC
- Output Voltage: 0.5 - 4.5 VDC
(Linearly corresponding to 0 - 1.6 MPa)
- Accuary: 0.5% - 1% FS
**************************************************************/
/************************************************************
Water Sensor Calibration
The output voltage offset of the sensor is 0.5V (norminal).
However, due to the zero-drifting of the internal circuit, the
no-load output voltage is not exactly 0.5V. Calibration needs to
be carried out as follow.
Calibration: connect the 3 pin wire to the Arduio UNO (VCC, GND and Signal)
without connecting the sensor to the water pipe and run the program
for once. Mark down the LOWEST voltage value through the serial
monitor and revise the "OffSet" value to complete the calibration.
After the calibration the sensor is ready for measuring!
**************************************************************/
#include <Wire.h>
#include <DFRobot_RGBLCD.h> //LCD header file
const float OffSet = 0.483 ;
float V;
int P;
unsigned int lcd_r = 0, lcd_g = 0, lcd_b = 0;
unsigned long delaytime = 0, lighttime = 0;
DFRobot_RGBLCD lcd(16, 2);
void setup()
{lcd.init();
delay(5000);
Serial.begin(115200);
Serial.println("hello start");
lighttime = millis();
lcd.setCursor(0, 0);
lcd.print("Water Pressure:");
lcd.setRGB(255, 255, 000);
}
void loop() {
lcd_r = random(256);
delayMicroseconds(10);
lcd_g = random(256);
delayMicroseconds(10);
lcd_b = random(256);
if (millis() - lighttime > 3000)
{
lcd.setRGB(lcd_r, lcd_g, lcd_b);
lighttime = millis();
}
//delay(100);
V = analogRead(0)* 5.00 / 1024; //Sensor output volta
ge
//LCD display
P = (V - OffSet) * 400*10; //Calculate water pre
ssure
lcd.setCursor(3, 1);
lcd.print( P/ 10000% 10); //LCD display
lcd.print( P/ 1000% 10);
lcd.print( P/ 100 % 10);
lcd.print( P/ 10 % 10);
lcd.print('.');
lcd.print( P % 10);
lcd.print(" kPa");
}
Expected Results
Water Pressure Display
Installation
Installation Scenes
Installation Scenes
Tube Water Pressure Detection
Bottom Water Pressure Detection
magma W1” Wm @
NOTE:
1.To guarantee the interface tightness, you need to install a waterproof nut and bind PTFE
tape.
2.Please take necessary measures to avoid large pressure involved during usage.
FAQ
A. Click the topic link on DFRobot Forum.
For any questions, advice or cool ideas to share, please visit the DFRobot Forum.
More Documents
https://www.dfrobot.com/wiki/index.php/Gravity:_Water_Pressure_Sensor_SKU:_SEN0257 2-6-18

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