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97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
/*
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* Author: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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/* This example demonstrates how to use one of the ADS1115 ADCs on the
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* DFRobot Joule Shield with devices that output a small differential
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* voltage (e.g. geophones, piezoelectric bands or pads, thermocouples).
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*/
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#include <fstream>
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#include <iostream>
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#include <string>
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#include <thread>
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#include "ads1115.hpp"
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#include "ads1x15.hpp"
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#include "upm_utilities.h"
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using namespace std;
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using namespace upm;
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bool running = true; // Controls main read/write loop
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// Thread function
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void
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stop()
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{
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upm_delay(10);
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running = false;
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}
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int
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main()
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{
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//! [Interesting]
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long id = 0; // Sample number
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string fileName = "./ads1115.data"; // Output filename
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ofstream f;
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// Initialize and configure the ADS1115 for the SM-24 Geophone
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// There are two ADS1115 chips on the DFRobot Joule Shield on the same I2C bus
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// - 0x48 gives access to pins A0 - A3
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// - 0x49 gives access to pins A4 - A7
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ADS1115 ads1115(0, 0x48);
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// Put the ADC into differential mode for pins A0 and A1,
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// the SM-24 Geophone is connected to these pins
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ads1115.getSample(ADS1X15::DIFF_0_1);
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// Set the gain based on expected VIN range to -/+ 2.048 V
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// Can be adjusted based on application to as low as -/+ 0.256 V, see API
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// documentation for details
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ads1115.setGain(ADS1X15::GAIN_TWO);
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// Set the sample rate to 860 samples per second (max) and turn on continuous
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// sampling
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ads1115.setSPS(ADS1115::SPS_860);
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ads1115.setContinuous(true);
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// Enable exceptions from the output stream
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f.exceptions(ofstream::failbit | ofstream::badbit);
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// Open the file
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try {
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f.open(fileName);
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// Output formatting
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f.setf(ios_base::fixed);
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f.precision(7);
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// Start the thread that will stop logging after 10 seconds
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thread timer(stop);
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// Read sensor data and write it to the output file every ms
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while (running) {
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f << id++ << " " << ads1115.getLastSample() << endl;
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upm_delay_us(1000);
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}
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// Clean-up and exit
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timer.join();
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f.close();
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} catch (ios_base::failure& e) {
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cout << "Failed to write to file: " << e.what() << endl;
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return 1;
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}
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cout << "Wrote " << id << " samples to file: " << fileName << endl;
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//! [Interesting]
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return 0;
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}
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