HP03S pressure sensor module

The HP03S is a pressure and temperature module with:

• standard I2C interface plus two additional output pins required
• 300-1100hpa absolute pressure range
• -20..+60°C temperature range
• Supply voltage 2.2v-3.6v with automatic power down switching
• Low power consumption: 1µA standby supply current; 500µA supply current during conversion

Use the HP03S module for it.

Wiring

You need an SO-xx adapter if you want to use it with a breadboard.

You can use any I2C port, e.g. I2C1. Additionally a simple output pin and one pwm pin are required.

Device Pin	Espruino e.g. Wifi	Description
1 SCL	B8 I2C1 SCL
2 SDA	B9 I2C1 SDA	Don\'t forget I²C pullup
3 XCLR	B0	Any Espruino output pin
4 MCLK	B7 PWM	pwm pin - internal clock for the AD-converter
5 VDD	3.3
6 VSS	GND

Important Notices from the datasheet: Never unplug the module when power is on.

Initialisiation

I2C1.setup( { scl: B6, sda: B7 } );
var hp03s = require('HP03S').connect( { i2c: I2C1, mclk: B4, xclr: B5 } );

Reading pressure in Pa and temperature in °C

I2C1.setup( { scl: B6, sda: B7 } );
var hp03s = require('HP03S').connect( { i2c: I2C1, mclk: B4, xclr: B5 } );

hp03s.getPressure( function( pressure, temperature ) {
    console.log( "Pressure    = " + pressure + " Pa" ); 
    console.log( "Temperature = " + temperature + " °C" ); 
} );

You can only start a new measurement when a previous measurement is completed.

Links

• Manufacturer http://www.hoperf.com/pressure_sensor/digital/HP03S.html
• Datasheet http://www.hoperf.com/upload/sensor/HP03S.pdf

Buying

• AliExpress http://www.aliexpress.com/wholesale?SearchText=hp03s
• Pollin https://www.pollin.de/shop/dt/MDg4OTgxOTk-

References

exports.connect = function (option, onReady) { ... }

/* Read the pressure in Pa and the temperature in °C from the sensor
 * @param callback with parameters pressure {number} and temperature {number}
 */
HP03S.prototype.getPressure = function (callback) { ... }

/* Trigger one measurement (either pressure or temperature)
 * @param pressureOrTemperatureCommand select pressure or temperature measurement: 0xf0 → measure pressure, 0xe8 → measure temperature
 * @param completed called when result is available
 */
HP03S.prototype.measure = function (pressureOrTemperatureCommand, completed) { ... }