Hi ,
I am trying to get current temperature (LM35) and post the data to a cloud server with help of TI CC3000 shield.
The sensor is OK, I can get the temperature. The CC3000 is OK as well, I can connect to my WIFI and get the IP address of cloud server. But when I compose the http package and ready to send it, it always reset, the setup() runs more than once.
I guess that it is due to out of RAM when composing the http package string, as it got reset even I comment out the client.fastrprint parts.
Here is my code, would you please help me out? I am still new to Arduino and I am stuck for days, any comments would be appreciated.
#include <Adafruit_CC3000.h>
#include <ccspi.h>
#include <SPI.h>
#define CC3000_IRQ 3
#define CC3000_VBAT 5
#define CC3000_CS 10
// Security can be WLAN_SEC_UNSEC, WLAN_SEC_WEP, WLAN_SEC_WPA or WLAN_SEC_WPA2
#define WLAN_SECURITY WLAN_SEC_WPA2
// cannot be longer than 32 characters!
#define WLAN_SSID "xiaomi"
// For connecting router or AP, don't forget to set the SSID and password here!!
#define WLAN_PASS "mypass"
#define WEBSITE "arduiview.herokuapp.com"
//The sensor id in mongoDB, currently we have only one sensor
#define SENSOR_ID "561083be06dd6162658ae8c8";
Adafruit_CC3000 cc3000 = Adafruit_CC3000(
CC3000_CS,
CC3000_IRQ,
CC3000_VBAT,
SPI_CLOCK_DIVIDER); // you can change this clock speed
static Adafruit_CC3000_Client client;
uint32_t ip = 0;
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 5L * 1000L; // delay between updates, in milliseconds
void setup() {
Serial.begin(115200);
initWifiConnection();
}
void loop() {
postTemperatureToCloudServer();
}
void postTemperatureToCloudServer() {
if ( millis() - lastConnectionTime > postingInterval) {
//connectToCloudServer
Serial.println(F("trying to connect to cloud server....."));
//client.close();
client = cc3000.connectTCP(ip, 80);
Serial.println(F("connected to cloud server - "));
Serial.println(WEBSITE );
Serial.println(F("begin uploading..."));
float temp = 0.0;
// get the current temperature from sensor
int reading = analogRead(0);
temp = reading * 0.0048828125 * 100;
Serial.print(F("Current temp"));
Serial.println(temp);
int length;
char sTemp[] = "";
//convert float to char*,
dtostrf(temp,2,2, sTemp); //val, integer part width, precise, result char array
//itoa(temp, sTemp,10);
Serial.println(sTemp);
char sLength[3];
//prepare the http body
//
//{
// "value" : 55.23
//}
//
char httpPackage[] = "";
strcat(httpPackage, "{\"value\": \"");
strcat(httpPackage, sTemp);
strcat(httpPackage, "\" }");
// get the length of data package
length = strlen(httpPackage);
// convert int to char array for posting
itoa(length, sLength, 10);
Serial.print(F("body lenght="));
Serial.println(sLength);
//prepare the http header
Serial.println(F("Sending headers..."));
client.fastrprint(F("PUT /api/sensors/"));
char *sensorId = SENSOR_ID;
client.fastrprint(sensorId);
client.fastrprint(F("/values"));
client.fastrprintln(F(" HTTP/1.1"));
Serial.print(F("."));
client.fastrprintln(F("Host: "));
client.fastrprint(WEBSITE);
Serial.print(F("."));
client.fastrprint(F("content-type: "));
client.fastrprintln(F("application/json"));
Serial.print(F("."));
client.fastrprint(F("Content-Length: "));
client.fastrprintln(sLength);
client.fastrprintln(F(""));
Serial.print(F("."));
Serial.println(F("header done."));
//send data
Serial.println(F("Sending data"));
client.fastrprintln(httpPackage);
Serial.println(F("===upload completed."));
// Get the http page feedback
unsigned long rTimer = millis();
Serial.println(F("Reading Cloud Response!!!\r\n"));
while (millis() - rTimer < 2000) {
while (client.connected() && client.available()) {
char c = client.read();
Serial.print(c);
}
}
delay(1000); // Wait for 1s to finish posting the data stream
client.close(); // Close the service connection
/*
*/
Serial.println(F("upload completed\n"));
// note the time of last uploading
lastConnectionTime = millis() ;
}
}
void initWifiConnection()
{
/* Initialise the module */
//Serial.println(F("\nInitialising the CC3000 ..."));
if (!cc3000.begin())
{
Serial.println(F("Unable to initialise the CC3000! Check your wiring?"));
while (1);
}
/* Attempt to connect to an access point */
char *ssid = WLAN_SSID; /* Max 32 chars */
Serial.print(F("\nAttempting to connect to "));
Serial.println(ssid);
/* NOTE: Secure connections are not available in 'Tiny' mode!
By default connectToAP will retry indefinitely, however you can pass an
optional maximum number of retries (greater than zero) as the fourth parameter.
*/
if (!cc3000.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) {
Serial.println(F("Failed!"));
while (1);
}
//Serial.println("\nconnected to WIFI.");
/* Wait for DHCP to complete */
//Serial.println("\nRequest DHCP");
while (!cc3000.checkDHCP())
{
delay(1000); // ToDo: Insert a DHCP timeout!
}
// Try looking up the website's IP address
Serial.print(WEBSITE); Serial.print(F(" -> "));
while (ip == 0) {
if (! cc3000.getHostByName(WEBSITE, &ip)) {
Serial.println(F("Couldn't resolve!"));
}
delay(500);
}
cc3000.printIPdotsRev(ip);
//Serial.println("\nDHCP is OK");
Serial.println("Initialization completed.\n");
}
The serial output is , you will noticed that it is reset, the outout is trunced at Serial.println(F("connected to cloud server - ")); Serial.println(WEBSITE );
Attempting to connect to xiaomi
arduiview.herokuapp.com -> 54.83.197.202Initialization completed.
trying to connect to cloud server.....
connected to cloud server -
arduiview.he
Attempting to connect to xiaomi
arduiview.herokuapp.com -> 54.83.197.202Initialization completed.
trying to connect to cloud server.....
connected to cloud server -
arduiview.he
Attempting to connect to xiaomi
arduiview.herokuapp.com -> 54.83.197.202Initialization completed.
trying to connect to cloud server.....
connected to cloud server -
arduiview.he
