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* DS7505.ino -- usage demonstration for the MaxThermo
* library, specifically DS7505 thermostat support.
* !!! NOTE !!! Because the DS7505 uses I2C, you MUST go into
* the library folder and edit
* includes/ThermoLibConfig.h
* to uncomment the MAXTHERMOLIB_ENABLE_I2C define
* and set the flag to get access to DS7505 functions.
* Copyright (C) 2013 Pat Deegan. All rights reserved.
* Please let me know if you use Thermocouple in your projects, and
* provide a URL if you'd like me to link to it from the library
* home.
* This program 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 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
* See file LICENSE for further informations on licensing
* terms.
// we must include Wire support here
#include <Wire.h>
// we want to include the library!
#include <MaxThermo.h>
// make sure you get a decent error message if you forgot...
#error "You MUST edit includes/ThermoLibConfig.h and set the MAXTHERMOLIB_ENABLE_I2C_SUPPORT flag for DS7505 support"
* serial_baud_rate
* Set this to the same baud rate used in the serial
* monitor.
#define serial_baud_rate 9600
* The DS7505 has a 3-bit address, configurable using the
* A2, A1 and A0 pins (tied to Vcc or ground). We assume
* they're all tied to ground here, change values to 1 where
* appropriate.
#define address_bit_2 0
#define address_bit_1 0
#define address_bit_0 0
* We'll be logging a bunch of samples, decide how many
* with num_samples_to_log.
* Note: these are in RAM, so don't overdo it--you'll
* get weird results or access memory you shouldn't and
* freeze the AVR.
* At ~250, you're getting really close to the limit,
* in this program...
#define num_samples_to_log 100
* Leave output_to_serial defined if you want
* to see anything on the serial monitor.
* Comment out if you just want to see how much
* space the lib takes when compiled (functionality
* here would add about 4.5k to your executable).
#define output_to_serial
#define delay_between_samples_logging 30
#define delay_between_samples_output 800
// Our thermostat instance, configured with the address
// bits defined above, and set to 12 bit resolution (can select 9-12 bits)
MaxThermo::DS7505 thermostat(address_bit_2, address_bit_1, address_bit_0, MaxThermo::DS7505::Resolution_12bits);
// We'll be keeping a bunch of samples in a list, while logging
// so here's the array:
MaxThermo::DS7505::SampleLog the_samples[num_samples_to_log];
// defines to keep serial stuff switchable on/off
#ifdef output_to_serial
#define SERIAL_BEGIN(b) Serial.begin(b)
#define SERIAL_PRINT(msg) Serial.print(msg)
#define SERIAL_PRINTN(msg) Serial.print(msg, DEC)
#define SERIAL_PRINTLN(msg) Serial.println(msg)
#define SERIAL_PRINTNLN(msg) Serial.println(msg, DEC)
#define SERIAL_BEGIN(b)
#define SERIAL_PRINT(msg)
#define SERIAL_PRINTN(msg)
#define SERIAL_PRINTLN(msg)
#define SERIAL_PRINTNLN(msg)
* Once we're done logging, we'll output some info about the
* results.
void logSummary() {
// Just to demonstrate, we'll get one sample from the log array
// and take a peak inside.
// get the sample
MaxThermo::DS7505::Sample aSample = thermostat.getSample(the_samples, 0);
// output some info
SERIAL_PRINT("The first sample ");
if (aSample.thermo()->isFault())
// was an error. This never happens for the DS7505, but
// demonstrates that the API is the same for all
// MaxThermo devices
SERIAL_PRINTLN("was a faulty reading.");
} else {
// all is well, output temperature.
SERIAL_PRINT("has temp:");
// show the internal temp, if we can
if (aSample.internal())
// again, this is never true for DS7505 but the API
// is the same in all instances, but for the construtor.
SERIAL_PRINT(" with internal temp of ");
// we could go through each of the samples in the array
// like this, but for now we'll just get a summary using
// the built-in method:
MaxThermo::LogSummary summary = thermostat.logSummary(the_samples, num_samples_to_log);
// output some info.
SERIAL_PRINTLN("********** Log Summary **********");
SERIAL_PRINT("Out of "); SERIAL_PRINTN(summary.entries_total); SERIAL_PRINT(" entries ( ");
SERIAL_PRINT((summary.faults == 1 ? " fault" : " faults")); // please the grammar police
SERIAL_PRINTLN(" encountered, ");
SERIAL_PRINTN(summary.entries_valid); SERIAL_PRINTLN(" valid):");
SERIAL_PRINT("\tAverage temp:\t");
SERIAL_PRINTLN("\nResuming regular probes...");
// wait a bit so you can see it.
void setup()
thermostat.begin(); // calling begin will set everything up, including SPI
// first we do some DS7505-specific stuff
// set the thermostat temperature:
// set target temp to 23.5f with hysteresis at 21 (C)
thermostat.setThermostat(23.5f, 21.0f);
// set the thermostat fault tolerance in the mid-range:
// we tell the lib we want to send the sample from each
// update() to this array of logging samples
thermostat.startLoggingTo(the_samples, num_samples_to_log);
SERIAL_PRINTLN("About to start logging...");
unsigned int dotCounter = 0;
void loop()
// tell the device to update (and log, if we're still doing that)
if (thermostat.update() == MaxThermo::Status::LogFull)
// we were logging, now we're done!
thermostat.stopLogging(); // must acknowledge that we know its done
else if (thermostat.status() == MaxThermo::Status::OK)
// all was well.
if (thermostat.isLogging())
// we're still logging, don't clutter the Serial output,
// just show we're alive
if (dotCounter++ > 39)
dotCounter = 0;
else {
// log is done, so now we output temp
float temperature = thermostat.thermoTemp();
SERIAL_PRINT(" (which is ");
else {
// update didn't say "OK" and it's not that the log
// is full... lets see why.
const char * err_type; // will hold appropiate error
// get the last status
case MaxThermo::Status::ShortToVcc:
err_type = "Short to VCC";
case MaxThermo::Status::ShortToGround:
err_type = "Short to GND";
case MaxThermo::Status::OpenCircuit:
err_type = "Open Circuit";
case MaxThermo::Status::InconsistentResponses:
err_type = "inconsistent thermo/internal data";
err_type = "Unknown error?!";
// output reason for failure.
// take a break, longer if we're finished logging:
delay(thermostat.isLogging() ? delay_between_samples_logging : delay_between_samples_output );