Seeed Grove - Barometer User manual
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Document Revision History
Revision
Date
Author
Description
1.0
Sep 21, 2015
Victor.He
Create file
3
Contents
Document Revision History···································································································2
1. Introduction ···················································································································2
2. Features··························································································································3
3. Application ideas············································································································4
4. Specifications ·················································································································5
5. Usage······························································································································6
5.1 With Arduino····················································································································· 6
6. Resources ·····················································································································11
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Disclaimer
For physical injuries and possessions loss caused by those reasons which are not related to product quality,
such as operating without following manual guide, natural disasters or force majeure, we take no
responsibility for that.
Under the supervision of Seeed Technology Inc., this manual has been compiled and published which
covered the latest product description and specification. The content of this manual is subject to change
without notice.
Copyright
The design of this product (including software) and its accessories is under tutelage of laws. Any action to
violate relevant right of our product will be penalized through law. Please consciously observe relevant local
laws in the use of this product.
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1. Introduction
This Grove - Barometer (High-Accuracy) Sensor features a HP206C high-accuracy chip to detect
barometric pressure, Altimeter and temperature. It can widely measure pressure ranging from
300mbar~1200mbar, with a super high accuracy of 0.01mbar (0.1m) in ultra-high resolution mode. The
chip only accepts 1.8V to 3.6V input voltage. However, with outer circuit added, this module becomes
compatible with 3.3V and 5V. Therefore, it can be used on Arduino/Seeeduino or Seeeduino Stalker
without modification. It is designed to be connected directly to a micro-controller via the I2C bus.
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2. Features
Digital two wire (I2C) interface
Command-based Reading, Compensated (Optional)
Programmable Events and Interrupt Controls
Full Data Compensation
Wide barometric pressure range
Flexible supply voltage range
Ultra-low power consumption
Altitude Resolution down to 0.01 meter
Temperature measurement included
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3. Application ideas
High Precision Mobile Altimeter / Barometer
Industrial Pressure and Temperature Sensor System
Automotive Systems
Personal Electronics Altimetry
Adventure and Sports watches
Medical Gas Control System
Weather Station Equipment
Indoor Navigation and Map Assist
Heating, Ventilation, Air Conditioning
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4. Specifications
Item
Min
Typical
Max
Unit
Voltage
3.3
5
5.5
VDC
Current
635
/
1100
uA
Pressure Range
300
/
1200
hPa
Faster I2C data transfer
/
/
10
MHZ
Dimension
20.4*41.8*9.7
mm
Weight
/
g
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5. Usage
5.1With Arduino
Barometric condition is one of the criteria used to predict coming change in weather and deduce altitude
above sea level. Here is a demo to show you how to read the barometric data from this Grove - Barometer
Sensor.
1. Connect it to IIC port of Seeeduino or Grove - Base Shield via a Grove cable. And connect Arduino to PC
via a USB cable.
2. Download the library Grove_Barometer_HP20x;Unzip it into the libraries file of Arduino IDE by the
path: ..\arduino-1.0.1\libraries.
3. Create a new Arduino sketch and paste the codes below to it or open the code directly by the path:
File > Example >Barometer_Sensor>Barometer_Sensor.
/*
* Demo name : HP20x_dev demo
* Usage : I2C PRECISION BAROMETER AND ALTIMETER [HP206C hopeRF]
* Author : Oliver Wang from Seeed Studio
* Version : V0.1
* Change log : Add kalman filter 2014/04/04
*/
#include <HP20x_dev.h>
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#include "Arduino.h"
#include "Wire.h"
#include <KalmanFilter.h>
unsigned char ret =0;
/* Instance */
KalmanFilter t_filter;//temperature filter
KalmanFilter p_filter;//pressure filter
KalmanFilter a_filter;//altitude filter
void setup()
{
Serial.begin(9600); // start serial for output
Serial.println("****HP20x_dev demo by seeed studio****\n");
Serial.println("Calculation formula: H = [8.5(101325-P)]/100 \n");
/* Power up,delay 150ms,until voltage is stable */
delay(150);
/* Reset HP20x_dev */
HP20x.begin();
delay(100);
/* Determine HP20x_dev is available or not */
ret =HP20x.isAvailable();
if(OK_HP20X_DEV == ret)
{
Serial.println("HP20x_dev is available.\n");
}
else
{
Serial.println("HP20x_dev isn't available.\n");
}
}
void loop()
{
char display[40];
if(OK_HP20X_DEV == ret)
{
Serial.println("------------------\n");
long Temper =HP20x.ReadTemperature();
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Serial.println("Temper:");
float t =Temper/100.0;
Serial.print(t);
Serial.println("C.\n");
Serial.println("Filter:");
Serial.print(t_filter.Filter(t));
Serial.println("C.\n");
long Pressure =HP20x.ReadPressure();
Serial.println("Pressure:");
t =Pressure/100.0;
Serial.print(t);
Serial.println("hPa.\n");
Serial.println("Filter:");
Serial.print(p_filter.Filter(t));
Serial.println("hPa\n");
long Altitude =HP20x.ReadAltitude();
Serial.println("Altitude:");
t =Altitude/100.0;
Serial.print(t);
Serial.println("m.\n");
Serial.println("Filter:");
Serial.print(a_filter.Filter(t));
Serial.println("m.\n");
Serial.println("------------------\n");
delay(1000);
}
}
4. Open the serial monitor to receive the sensor's data including temperature, barometric pressure value,
relative atmosphere pressure and altitude.
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The following is a reference graph plotting out the relationship between altitude above sea level and
barometric pressure.
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