Enrico Marinoni / Mbed 2 deprecated NUCLEO-F401RE-DS1820andThermistorNTC10K

NUCLEO-F401RE + DS18B20 + Thermistor Thermistor (NTC) of 10K - For calculate the temperature we use the Steinhart-Hart equation, see here: http://www.emcu.it/RaspBerryPi/RaspBerryPi_UK.html#Misura_NTC ATTENTION: Thermistor response, not fully tested.

Dependencies:   DS1820 mbed

Fork of DS1820_HelloWorld by Erik -

main.cpp@4:02a922030bc3, 2016-01-07 (annotated)

Committer:
emcu
Date:
Thu Jan 07 00:29:30 2016 +0000
Revision:
4:02a922030bc3
Parent:
3:f483abe4bc57 
NUCLEO-F401RE + DS18B20 + Thermistor; Thermistor (NTC) of 10K - For calculate the temperature we use the Steinhart-Hart equation.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emcu 4:02a922030bc3 1
emcu 4:02a922030bc3 2 /**
emcu 4:02a922030bc3 3
emcu 4:02a922030bc3 4 NUCLEO-F401RE + DS18B20 + Thermistor
emcu 4:02a922030bc3 5 Thermistor response, not fully tested.
emcu 4:02a922030bc3 6
emcu 4:02a922030bc3 7 By: www.emcu.it
emcu 4:02a922030bc3 8 Date: Jan.2015
emcu 4:02a922030bc3 9 Version: 1.0
emcu 4:02a922030bc3 10 Name: NUCLEO-F401RE-DS1820andThermistorNTC10K
emcu 4:02a922030bc3 11 NOTE: For more info see here: http://www.emcu.it/NUCLEOevaBoards/mBed/QSG-Mbed-Library.pdf
emcu 4:02a922030bc3 12
emcu 4:02a922030bc3 13 THE SOFTWARE AND HARDWARE ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
emcu 4:02a922030bc3 14 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
emcu 4:02a922030bc3 15 FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
emcu 4:02a922030bc3 16 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
emcu 4:02a922030bc3 17 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
emcu 4:02a922030bc3 18 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
emcu 4:02a922030bc3 19
emcu 4:02a922030bc3 20 UART Configuration (It is necessary for see the results, we suggest to use TeraTerm on PC)
emcu 4:02a922030bc3 21 Baud Rate: 9600
emcu 4:02a922030bc3 22 Data Bit: 8
emcu 4:02a922030bc3 23 Parity: NONE
emcu 4:02a922030bc3 24 Stop Bit: 1
emcu 4:02a922030bc3 25 Flow Control: NONE
emcu 4:02a922030bc3 26
emcu 4:02a922030bc3 27 This SW is ready to use on the NUCLEO-F334R8.
emcu 4:02a922030bc3 28 Connect to the NUCLEO-F334R8 the DS18B20 sensor (see the schematic below).
emcu 4:02a922030bc3 29 The temperature sampling time is 1 sec.
emcu 4:02a922030bc3 30
emcu 4:02a922030bc3 31 DS18B20 front view
emcu 4:02a922030bc3 32 __________
emcu 4:02a922030bc3 33 | |
emcu 4:02a922030bc3 34 | DS |
emcu 4:02a922030bc3 35 | 18B20 |
emcu 4:02a922030bc3 36 | |
emcu 4:02a922030bc3 37 |__________|
emcu 4:02a922030bc3 38 | | |
emcu 4:02a922030bc3 39 1 2 3
emcu 4:02a922030bc3 40 GND DQ VCC (3V3)
emcu 4:02a922030bc3 41 | | |______________ to VCC (3.3V on the NUCLEO-F401RE)
emcu 4:02a922030bc3 42 | | _|_
emcu 4:02a922030bc3 43 | | | |
emcu 4:02a922030bc3 44 | | | | 4K7
emcu 4:02a922030bc3 45 | | | |
emcu 4:02a922030bc3 46 | | -|-
emcu 4:02a922030bc3 47 | |___|______________ to A1 (on the NUCLEO-F401RE)
emcu 4:02a922030bc3 48 |
emcu 4:02a922030bc3 49 |
emcu 4:02a922030bc3 50 |______________________ to GND (on the NUCLEO-F401RE)
emcu 4:02a922030bc3 51
emcu 4:02a922030bc3 52 This SW is just for only one DS18B20
emcu 4:02a922030bc3 53 This SW is a derivative of:: https://developer.mbed.org/users/Sissors/code/DS1820_HelloWorld/
emcu 4:02a922030bc3 54 On the: https://developer.mbed.org/users/Sissors/code/DS1820_HelloWorld/ there is a multi sensor (DS18B20) example.
emcu 4:02a922030bc3 55
emcu 4:02a922030bc3 56 Thermistor of 10K - For calculate the temperature we use the Steinhart-Hart equation, see here:
emcu 4:02a922030bc3 57 http://www.emcu.it/RaspBerryPi/RaspBerryPi_UK.html#Misura_NTC
emcu 4:02a922030bc3 58
emcu 4:02a922030bc3 59
emcu 4:02a922030bc3 60 ___________________ to VCC (3.3V on the NUCLEO-F401RE)
emcu 4:02a922030bc3 61 |
emcu 4:02a922030bc3 62 _|_
emcu 4:02a922030bc3 63 | |
emcu 4:02a922030bc3 64 | | 10K Thermistor (NTC)
emcu 4:02a922030bc3 65 | |
emcu 4:02a922030bc3 66 -|-
emcu 4:02a922030bc3 67 |___________________ to A5 (on the NUCLEO-F401RE)
emcu 4:02a922030bc3 68 _|_ |
emcu 4:02a922030bc3 69 | | |
emcu 4:02a922030bc3 70 | | 10K _|_
emcu 4:02a922030bc3 71 | | ___ 0,47uF
emcu 4:02a922030bc3 72 -|- |
emcu 4:02a922030bc3 73 | |
emcu 4:02a922030bc3 74 |_________|_________ to GND (on the NUCLEO-F401RE)
emcu 4:02a922030bc3 75
emcu 4:02a922030bc3 76
emcu 4:02a922030bc3 77 */
emcu 4:02a922030bc3 78
emcu 4:02a922030bc3 79
emcu 4:02a922030bc3 80
Sissors 0:e069f9f26768 81 #define MULTIPLE_PROBES
emcu 4:02a922030bc3 82 #define DATA_PIN A1
Sissors 0:e069f9f26768 83
Sissors 0:e069f9f26768 84 #ifdef MULTIPLE_PROBES
Sissors 0:e069f9f26768 85
Sissors 0:e069f9f26768 86 #include "mbed.h"
Sissors 0:e069f9f26768 87 #include "DS1820.h"
Sissors 0:e069f9f26768 88
Sissors 0:e069f9f26768 89 #define MAX_PROBES 16
emcu 4:02a922030bc3 90
emcu 4:02a922030bc3 91 float get_temperature(void);
emcu 4:02a922030bc3 92
emcu 4:02a922030bc3 93 AnalogIn thermistor(A5); // Thermistor
emcu 4:02a922030bc3 94
emcu 4:02a922030bc3 95 float temp=0;
emcu 4:02a922030bc3 96 float tempArr[100];
emcu 4:02a922030bc3 97 int n=0;
emcu 4:02a922030bc3 98
Sissors 0:e069f9f26768 99 DS1820* probe[MAX_PROBES];
Sissors 0:e069f9f26768 100
Sissors 0:e069f9f26768 101 int main() {
Sissors 0:e069f9f26768 102 // Initialize the probe array to DS1820 objects
Sissors 0:e069f9f26768 103 int num_devices = 0;
Sissors 0:e069f9f26768 104 while(DS1820::unassignedProbe(DATA_PIN)) {
Sissors 0:e069f9f26768 105 probe[num_devices] = new DS1820(DATA_PIN);
Sissors 0:e069f9f26768 106 num_devices++;
Sissors 0:e069f9f26768 107 if (num_devices == MAX_PROBES)
Sissors 0:e069f9f26768 108 break;
Sissors 0:e069f9f26768 109 }
Sissors 0:e069f9f26768 110
Sissors 0:e069f9f26768 111 printf("Found %d device(s)\r\n\n", num_devices);
emcu 4:02a922030bc3 112 while(1)
emcu 4:02a922030bc3 113 {
Sissors 0:e069f9f26768 114 probe[0]->convertTemperature(true, DS1820::all_devices); //Start temperature conversion, wait until ready
Sissors 0:e069f9f26768 115 for (int i = 0; i<num_devices; i++)
emcu 4:02a922030bc3 116 printf("Device %d returns %3.3foC\r\n", i, probe[i]->temperature());
emcu 4:02a922030bc3 117
emcu 4:02a922030bc3 118 for(n=0; n<100; n++)
emcu 4:02a922030bc3 119 {
emcu 4:02a922030bc3 120 tempArr[n]=get_temperature();
emcu 4:02a922030bc3 121 wait_ms(10);
emcu 4:02a922030bc3 122 }
emcu 4:02a922030bc3 123 temp=0;
emcu 4:02a922030bc3 124 for(n=0; n<100; n++)
emcu 4:02a922030bc3 125 temp=temp + tempArr[n];
emcu 4:02a922030bc3 126 temp=temp/100;
emcu 4:02a922030bc3 127 printf("NTC returns %3.3foC\r\n\n\r", temp);
emcu 4:02a922030bc3 128
Sissors 0:e069f9f26768 129 wait(1);
Sissors 0:e069f9f26768 130 }
Sissors 0:e069f9f26768 131
Sissors 0:e069f9f26768 132 }
Sissors 0:e069f9f26768 133
Sissors 0:e069f9f26768 134 #else
Sissors 0:e069f9f26768 135 #include "mbed.h"
Sissors 0:e069f9f26768 136 #include "DS1820.h"
Sissors 0:e069f9f26768 137
Sissors 0:e069f9f26768 138 DS1820 probe(DATA_PIN);
Sissors 0:e069f9f26768 139
Sissors 0:e069f9f26768 140 int main() {
Sissors 0:e069f9f26768 141 while(1) {
Sissors 0:e069f9f26768 142 probe.convertTemperature(true, DS1820::all_devices); //Start temperature conversion, wait until ready
emcu 4:02a922030bc3 143 printf("It is %3.3foC\r\n", probe.temperature());
Sissors 0:e069f9f26768 144 wait(1);
Sissors 0:e069f9f26768 145 }
Sissors 0:e069f9f26768 146 }
Sissors 0:e069f9f26768 147
emcu 4:02a922030bc3 148 #endif
emcu 4:02a922030bc3 149
emcu 4:02a922030bc3 150 /*
emcu 4:02a922030bc3 151 Thermistor (NTC) of 10K - For calculate the temperature we use the Steinhart-Hart equation, see here:
emcu 4:02a922030bc3 152 http://www.emcu.it/RaspBerryPi/RaspBerryPi_UK.html#Misura_NTC
emcu 4:02a922030bc3 153 ATTENTION: Thermistor response, not fully tested.
emcu 4:02a922030bc3 154 */
emcu 4:02a922030bc3 155 float get_temperature(void)
emcu 4:02a922030bc3 156 {
emcu 4:02a922030bc3 157 unsigned int a, beta = 3975;
emcu 4:02a922030bc3 158 float temperature, resistance;
emcu 4:02a922030bc3 159
emcu 4:02a922030bc3 160 a = thermistor.read_u16();
emcu 4:02a922030bc3 161
emcu 4:02a922030bc3 162 /* Calculate the resistance of the thermistor from analog votage read. */
emcu 4:02a922030bc3 163 resistance = (float) 10000.0 * ((65536.0 / a) - 1);
emcu 4:02a922030bc3 164
emcu 4:02a922030bc3 165 /* Convert the resistance to temperature using Steinhart's Hart equation */
emcu 4:02a922030bc3 166 temperature=(1/((log(resistance/10000.0)/beta) + (1.0/298.15)))-273.15;
emcu 4:02a922030bc3 167
emcu 4:02a922030bc3 168 return temperature;
emcu 4:02a922030bc3 169 }