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IoT temperature CLOUD logger with GSM and 1wire sensor howto

 

About the project

Build your own IoT temperature logger with CLOUD data upload. This project use for data transmission dual SIM full size GSM shield [a-gsmII], dual SIM full size GSM GNSS shield [b-gsmgnss] or our older a-gsm shield and Dallas/Maxim 18B20 1wire temperature sensor.

Required time: 30-45 minutes - hardware side and around 30-60 minutes software and cloud setup side.

Difficulty: beginner - intermediate.

 

IoT hardware bill of materials

IoT temperature CLOUD logger GSM :: BILL OF MATERIALS

 

CREDITS

Inside this project we used for 1WIRE temperature the "Dallas Temperature Control Library" developed by Miles Burton & Tim Newsome >> Arduino Library for Dallas Temperature ICs reference here. Thank you guys! Nice job!

 

About GSM shield used in this project

In this how to a-gsmII v2.105shield is used for representation. Same hardware settings applies for b-gsmgnss and a-gsm [for the last one differs only the SIM socket and voltage selector positioning].

More about shields:
a-gsmII documentation
b-gsmgnss documentation
a-gsm documentation

 

DALLAS/MAXIM 18B20 temperature sensor

Solder the 8.2kb resistor between 18B20 Vdd pin(3)and 18B20 DQ pin(2). 18B20 Vdd pin(3) must be wired to Arduino 5V, 18B20 DQ pin(2) to Arduino D8 and 18B20 GND pin(1) to Arduino GND....see details bellow. DALLAS/MAXIM 18B20 reference here.

wiring DALLAS/MAXIM 1WIRE 18B20 / 18S20 1WIRE temperature sensor with Arduino UNO

 

Hardware connections

In the picture bellow all bundled together:

IoT temperature CLOUD logger GSM :: HARDWARE HOW TO WIRE

 

Hardware and wiring steps:

  • solder the ARDUINO headers to a-gsmII shield
  • plug-in [insert] the a-gsmII shield into Arduino UNO
  • set the a-gsmII "Voltage selector" jumper in "Vin" position
  • insert the SIM card in primary SIM socket [a-gsmII/b-gsmgnss - the SIM socket being in the proximity of the PCB; a-gsm - the SIM socket placed on TOP]. The SIM must have disabled the PIN checking proceedure [remove PIN check, here].
  • Solder the 8k2 resistor to bw. 18B20 Vdd pin(3)and 18B20 DQ pin(2). Solder wires to 18B20 terminals.
  • Wire 18B20 Vdd pin(3) to Arduino 5V, 18B20 DQ pin(2) to Arduino D8 and 18B20 GND pin(1) to Arduino GND.
  • connect Arduino UNO USB to your PC

 

HINT:Multiple 1WIRE temperature sensors are required? Just connect them in paralel mode (single pull up resistor requiered... check for proper value...), hack the software (use 1,2.. sensorIndex in "sensors.getTempCByIndex(sensorIndex)" and multiple upload sessions) and define multiple token sensors in Cloud.

 

Software

a. Download the itbpGSMclass library [beta]: "a-gsmII series software IoT REST support for ARDUINO" from a-gsmII download section, or "b-gsmgnss series software IoT REST support for ARDUINO" from b-gsmgnss download section, or "a-gsm series software IoT REST support for ARDUINO" from a-gsm download section,

b. Uncompress the archive and install the class. In a nutshell, copy the the itbpGSMclass folder into your Arduino local user folder [mine is: "C:\Users\dragos\Documents\Arduino\libraries"] and restart Arduino environment. More detail about manual library installing, read Arduino library manual installation.

c. Make a folder named "agsmII_temperature_Robofun_cloud_logger".

d. Copy the code bellow, paste it one new file and save the file as "agsmII_temperature_Robofun_cloud_logger.ino" in the folder created in previous step. Alternate, you can download from here (right click & save as):
agsmII_temperature_Robofun_cloud_logger.ino : ARDUINO THERMAL SMS ALARM & GSM/3G SHIELD - main code

agsmII_temperature_Robofun_cloud_logger.ino

1/*
2agsmII_temp_Robofun_cloud_demo.ino v 0.2/20180302 - SOFTWARE EXAMPLE
3COPYRIGHT (c) 2015-2018 Dragos Iosub / R&D Software Solutions srl
4
5You are legaly entitled to use this SOFTWARE ONLY IN CONJUNCTION WITH itbrainpower.net DEVICES USAGE. Modifications, derivates and redistribution 
6of this software must include unmodified this COPYRIGHT NOTICE. You can redistribute this SOFTWARE and/or modify it under the terms 
7of this COPYRIGHT NOTICE. Any other usage may be permited only after written notice of Dragos Iosub / R&D Software Solutions srl.
8
9This SOFTWARE is distributed is provide "AS IS" in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied 
10warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11
12Dragos Iosub, Bucharest 2018.
13http://itbrainpower.net
14*/
15
16/*CLOUD specific info*/
17#define cloudURL        "http://iot.robofun.ro/api/v1/senzor/"
18#define sensorValURL    "/input?value="
19#define tempToken      "mvba9gs5fldntr5j85850of52f"      //replace this with your temperature sensor token!!!!
20//#define humiToken      "mp67hppb262b832df1vecrsg5g"    //replace this with your other sensor token, if any
21/*CLOUD specific info*/
22
23/* other settings, but very IMPORTANT*/
24//set SERVER_ADDRESS and SERVER_PORT in itbpGPRSIPdefinition.h Eg.: for ROBOFUN CLOUD  [#define SERVER_ADDRESS    "iot.robofun.ro"  and #define SERVER_PORT     "80" ]  
25//set APN, USERNAME and PASSWORD for your SIM card in itbpGPRSIPdefinition.h
26//choose itbrainpower modem used in itbpGSMdefinition.h
27/* other settings, but very IMPORTANT*/
28
29int samplingPeriod = 60;       //interval in seconds between scans... keep it > 60 sec
30
31/*local vars, sensors and actuators exchanged with the cloud*/
32//char dttime [31];
33//char IMEI [16];  
34//int VBAT = 0;   //value in milivolts
35double temperature = 0;
36/*local vars, sensors and actuators exchanged with the cloud*/
37
38#include <itbpGSMClass.h>
39
40#define DEBUG(x)    {__itbpDebugPort__.print(millis());__itbpDebugPort__.print(" - ");__itbpDebugPort__.println(x);}
41#define DEBUGP(x,y) {__itbpDebugPort__.print(millis());__itbpDebugPort__.print(" - ");__itbpDebugPort__.print(x);__itbpDebugPort__.println(y);}
42
43#if (__itbpModem__ != xyzmIoT)
44  int freeRam () {
45    extern int __heap_start, *__brkval; 
46    int v; 
47    return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval); 
48  }
49#endif
50
51// initialize the library instance
52aGsmClient client;
53
54/* sensor side here */
55#define ONE_WIRE_BUS       8         //Digital pin used for 1Wire temperature sensor reading
56#include <OneWire.h>
57#include <DallasTemperature.h>
58  
59// Setup a oneWire instance to communicate with any OneWire devices 
60OneWire oneWire(ONE_WIRE_BUS);
61// Pass our oneWire reference to Dallas Temperature.
62DallasTemperature sensors(&oneWire);
63/* sensor side here */
64
65
66unsigned long startTime = 0;
67bool ledState = 0;
68
69/*
70  This function is CLOUD specific!!! Written for ROBOFUN CLOUD.
71  Function to parse the server responce
72  Vars:
73    timeout  ==> int, timeout in seconds to wait for and parse the server responce
74  Returns:
75    1 on success
76    0 on error [found closed socket or PDP deactivation]
77    -1 on server timeout
78*/
79int readServerResponse(int timeout){
80
81  unsigned long startTime;
82  int ret =0;
83  startTime = millis(); 
84  delay(10);
85  __itbpDebugPort__.println(F("start read..."));
86  while(true){
87    client.readline(1000);
88    __itbpDebugPort__.println(client.resp);//just to see the server response
89    if (strstr(client.resp, "1;"))
90    {
91        __itbpDebugPort__.println(F("found confirmation..."));
92        ret = 1;
93    }
94
95    if (strstr(client.resp, "0;"))
96    {
97        __itbpDebugPort__.println(F("error returned..."));
98        ret = -1;
99    }
100    
101    if (strstr(client.resp, sockDisconnected0)||strstr(client.resp, sockDisconnected1)||strstr(client.resp, sockDisconnected2))
102    {
103        __itbpDebugPort__.println(F("sk disconnected..."));
104        client.stop();  //4 LTE and 3G
105        return ret;
106    }//sockDisconnected0
107    
108    if(millis() - startTime > (unsigned long)timeout*1000 )
109    {
110       __itbpDebugPort__.println(F("mark to..."));
111        client.stop(); //need to clean DATA interface and return the to AT command interface 
112        return -2;        
113    }  
114 }
115  return -3;//never here
116}
117
118/*  
119    write data to the socket.
120    This function is CLOUD/protocol specific!!! This is written for ROBOFUN CLOUD.  
121    Construct simple GET request. Eg.: "http://iot.robofun.ro/api/v1/senzor/rd53i6l1p02npjtv9971dab5jm/input?value=3.4"
122 */
123void sendGetRequest(char * sensorToken, double sensorData){
124    String data;
125    data = String(cloudURL) + String(sensorToken) + String(sensorValURL) + String(sensorData);
126    __itbpDebugPort__.println(data);
127
128    client.print("GET ");
129    client.print(data);
130    client.println(" HTTP/1.1");
131    client.println(F("Host: " SERVER_ADDRESS));
132    client.println(F("Connection: close"));
133    client.println();
134}
135
136
137/*
138    simple function that send [and receive] data to [from] CLOUD 
139 */
140
141void sendData( void){
142    //send temperture data
143    if (client.connected() || client.connect()){
144      sendGetRequest(tempToken, temperature);
145      //client.println("\r\n");
146      readServerResponse(SERVER_REPLY_TIMEOUT);
147    }else{
148      __itbpDebugPort__.println(F("Socket/GPRS error...")); 
149    }
150    /*
151    //send humidity data...or other sensor/token data
152     if (client.connected() || client.connect()){
153      sendGetRequest(humiToken, humidity);
154      //client.println("\r\n");
155      readServerResponse(SERVER_REPLY_TIMEOUT);
156    }else{
157      __itbpDebugPort__.println(F("Socket/GPRS error...")); 
158    }
159     */
160}
161
162
163
164void setup(){
165 delay(10000);
166 __itbpDebugPort__.begin(115200);   //start debug port connection
167 pinMode(13, OUTPUT);               //configure the UNO D13 as output - UNO embedded LED used as ARMED/DISARMED status indicator  
168 digitalWrite(13, LOW);   
169  ledState = 0;
170
171 /*sensor side*/
172  sensors.begin();                      //1Wire temperature sensor init
173 /*sensor side*/
174
175
176#if __itbpModem__ != xyzmIoT
177 DEBUGP(F("Free RAM: "), freeRam());
178#endif
179__itbpDebugPort__.println(F("...let's rock"));
180__itbpDebugPort__.flush();
181 
182 client.begin();
183
184 client.enableClockUpdate(1); //update available at next GSM boot
185
186 //client.getIMEI(); //IMEI value in client.resp
187 //memset(IMEI,0x00, sizeof(IMEI));
188 //strcpy(IMEI,client.resp);
189 //DEBUGP(F("IMEI: "), IMEI);
190
191 client.attachGPRS();
192 __itbpDebugPort__.println("connecting..."); 
193 
194 startTime = startTime + (unsigned long)samplingPeriod*1000;//force send on the spot
195
196}
197
198
199
200
201void loop(){
202 if (millis() - startTime < (unsigned long)samplingPeriod*1000){//waiting period
203    //__itbpDebugPort__.println(F("..."));
204
205  ledState = ! ledState;
206  if(ledState != 0)
207    digitalWrite(13, HIGH); 
208  else
209    digitalWrite(13, LOW); 
210  delay(500);
211 }
212 else{
213  startTime = millis();
214  digitalWrite(13, HIGH);   //show sampling + uploadto cloud
215
216  __itbpDebugPort__.println(F(""));
217  
218    sensors.requestTemperatures();
219  temperature = (double)sensors.getTempCByIndex(0);
220    
221    //temperature = 100*(rand() % 100);
222  DEBUGP(F("Temp: "),temperature);
223    
224  if (!client.connected()) client.transparent(); //switch to transparent socket mode, if available
225  
226  DEBUG(F("send sensors start"));
227  sendData();     //push sensors to the cloud
228  DEBUG(F("send sensors stop"));
229  
230    digitalWrite(13, LOW);     //show sampling + uploadto cloud
231  ledState = 0;
232 }
233}
234

e. Parameters/variables to be set in "agsmII_temperature_Robofun_cloud_logger.ino":
- tempToken [line 19] - replace with sensor token generated on Robofun cloud [see next chapter]
- samplingPeriod [line 29]

f. Parameters/variables to be set in "itbpGSMclass library":
- set SERVER_ADDRESS and SERVER_PORT in itbpGPRSIPdefinition.h for ROBOFUN CLOUD
#define SERVER_ADDRESS "iot.robofun.ro"
#define SERVER_PORT "80"

- set APN, USERNAME and PASSWORD for your SIM card in itbpGPRSIPdefinition.h
- choose itbrainpower modem used in itbpGSMdefinition.h, in this example:
#define __itbpModem__ agsmII

- also, good to know >> itbpGSMClassDebug, atDebug on / off and MAX_BUFFER_SIZE... in itbpGSMdefinition.h

 

Robofun cloud. Define new sensor. Copy TOKEN data

Open https://iot.robofun.ro.

Create new account.
IoT temperature CLOUD logger GSM :: CREATE NEW CLOUD ACCOUNT

Create new sensor.
IoT temperature CLOUD logger GSM :: CREATE NEW CLOUD SENSOR PROFILE STEP 1
IoT temperature CLOUD logger GSM :: CREATE NEW CLOUD SENSOR PROFILE STEP 2

Scroll down the page until "TOKEN" chapter.
IoT temperature CLOUD logger GSM :: Access temperature log data

Copy your sensor TOKEN id [up-here underlined with RED].

Use this value for tempToken [line 19 in "agsmII_temperature_Robofun_cloud_logger.ino"]

 

Robofun cloud. Visualize temperature log record

The temperature logged data can be visualized in Robofun cloud sensor page or, in public (shared) page. To do this, scroll up the page until "Share senzor" chapter, copy the public link or iframe (see bellow picture).
IoT temperature CLOUD logger GSM :: CREATE NEW CLOUD SENSOR PROFILE STEP 1

 

 

TUTORIAL PROVIDED WITHOUT ANY WARRANTY!!! USE IT AT YOUR OWN RISK!!!!

 

 

 

Dragos Iosub & itbrainpower.net team original how to.

 

 

 

 

document version 0.91 / 2018-03-02 © R&D Software Solutions srl