» Ga 10: Socket4 Sensor Reading
In this example the Gases 2.0 board and socket 4 are turned on, waiting for the minimum heating time and then reading the sensor every second while printing the output voltage and sensor resistance through the USB.
Required Materials
1 x Waspmote
1 x Battery
1 x Gases 2.0 board
1 x Socket 4 valid sensor:
- TGS2600
- TGS2602
- TGS2610
- TGS2611
- TGS2620
Notes
* BEWARE NOT TO USE THE TGS2442 FOR CO SENSOR NOR THE TGS2444 FOR NH3 SENSOR WITH THIS CODE
* Remember to connect the battery to Waspmote for proper operation.
* The connection of the sensor is described in the Gases 2.0 technical guide.
* The sensor gain and load resistor have been adjusted to operate with a given unit of a TGS2611 sensor, they will depend on the sensor used and the application, for more information about how to select this parameters take a look at the Gases 2.0 board technical guide.
* This example can only be executed in Waspmote v12
Code
/*
* ------ [Ga_10] - Socket4 Reading for Gases v20--------
*
* Explanation: Turn on the Gases Board v20 and reads the sensor
* placed on socket 4A every second, printing the result
* through the USB
*
* Copyright (C) 2012 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version: 0.1
* Design: David Gascón
* Implementation:
*/
#include <WaspSensorGas_v20.h>
#define GAIN 1 // GAIN of the sensor stage
#define RESISTOR 20 // LOAD RESISTOR of the sensor stage
// Variable to store the read value
float socket4AVal;
void setup()
{
// Turn on the USB and print a start message
USB.ON();
USB.println(F("start"));
delay(100);
// Turn on the sensor board
SensorGasv20.ON();
// Turn on the RTC
RTC.ON();
// Configure the 4A sensor socket
SensorGasv20.configureSensor(SENS_SOCKET4A, GAIN, RESISTOR);
// Turn on the sensor on socket 4A and wait for stabilization and
// sensor response time
SensorGasv20.setSensorMode(SENS_ON, SENS_SOCKET4A);
delay(40000);
}
void loop()
{
// Read the sensor
socket4AVal = SensorGasv20.readValue(SENS_SOCKET4A);
// Print the result through the USB
USB.print(F("SOCKET4A: "));
USB.print(socket4AVal);
USB.print(F("V - "));
// Conversion from voltage into kiloohms
socket4AVal = SensorGasv20.calculateResistance(SENS_SOCKET4A, socket4AVal, GAIN, RESISTOR);
USB.print(socket4AVal);
USB.println(F("kohms"));
delay(1000);
}
Output
B#
start
SOCKET4A: 2.6096773147V - 23.4053192138kohms
SOCKET4A: 2.6193547248V - 23.2433815002kohms
SOCKET4A: 2.6064515113V - 23.4595699310kohms
SOCKET4A: 2.6096773147V - 23.4053192138kohms