Grove Air Quality Sensor.
Fork of Grove_Air_Quality_Sensor_Library by
Air_Quality.cpp
- Committer:
- lucian@192-168-0-106.rdsnet.ro
- Date:
- 2016-12-23
- Revision:
- 3:c25365a52d78
- Parent:
- 2:95009177a860
- Child:
- 4:0ca4a9fd1b5d
File content as of revision 3:c25365a52d78:
/* AirQuality library v1.0 2010 Copyright (c) Seeed Technology Inc. All right reserved. Original Author: Bruce.Qin This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "Air_Quality.h" //Get the avg voltage in 5 minutes. void AirQuality::avgVoltage() { if (i == 150) { //sum 5 minutes standard_vol = temp / 150; temp = 0; debug_if(DEBUG_AIR_QUALITY, "Vol_standard in 5 minutes: %d", standard_vol); i = 0; } else { temp += first_vol; i++; } } void AirQuality::init(PinName pin) { _pin = pin; AnalogIn sensor(_pin); unsigned char i = 0; debug_if(DEBUG_AIR_QUALITY, "Air Quality Sensor Starting Up...(20s)"); wait(20); //20s init_voltage = (uint16_t) (sensor.read() * 1000); // boost the value to be on a 0 -> 1000 scale for compatibility debug_if(DEBUG_AIR_QUALITY, "The initial voltage is %d%% of source ", init_voltage / 10); while (init_voltage) { if ((init_voltage < 798) && (init_voltage > 10)) { // the init voltage is ok first_vol = (uint16_t) (sensor.read() * 1000); //initialize first value last_vol = first_vol; standard_vol = last_vol; debug_if(DEBUG_AIR_QUALITY, "Sensor ready."); error = false;; break; } else if (init_voltage > 798 || init_voltage <= 10) { // The sensor is not ready, wait a bit for it to cool off i++; debug_if(DEBUG_AIR_QUALITY, "Sensor not ready (%d), try %d/5, waiting 60 seconds...", init_voltage, i); wait(60);//60s init_voltage = (uint16_t) (sensor.read() * 1000); if (i == 5) { // After 5 minutes warn user that the sensor may be broken i = 0; error = true; debug_if(DEBUG_AIR_QUALITY, "Sensor Error! You may have a bad sensor. :-("); } } else break; } } air_quality_values AirQuality::slope(void) { while (timer_index) { if (first_vol - last_vol > 400 || first_vol > 700) { debug_if(DEBUG_AIR_QUALITY, "Very high pollution! Force signal active."); timer_index = 0; avgVoltage(); return VERY_HIGH_POLLUTION; } else if ((first_vol - last_vol > 400 && first_vol < 700) || first_vol - standard_vol > 150) { debug_if(DEBUG_AIR_QUALITY, "sensor_value:%d", first_vol); debug_if(DEBUG_AIR_QUALITY, "High pollution!"); timer_index = 0; avgVoltage(); return HIGH_POLLUTION; } else if ((first_vol - last_vol > 200 && first_vol < 700) || first_vol - standard_vol > 50) { // debug_if( DEBUG_AIR_QUALITY, first_vol - last_vol); debug_if(DEBUG_AIR_QUALITY, "sensor_value:%d", first_vol); debug_if(DEBUG_AIR_QUALITY, "Low pollution!"); timer_index = 0; avgVoltage(); return LOW_POLLUTION; } else { avgVoltage(); debug_if(DEBUG_AIR_QUALITY, "sensor_value:%d", first_vol); debug_if(DEBUG_AIR_QUALITY, "No pollution"); timer_index = 0; return NO_POLLUTION; } } return UNKNOWN; }