ESP8266 Community Forum

- Tue Mar 22, 2016 6:07 am #43774 Hi ,
How can I possibly transfer data I calculate and printed to Serial from :
SparkFun RGB Light Sensor - ISL29125
To :
ESP8266 Thing
?
I want to send the RGB data from the ISL29125 basic example at :
Hookup guide RGB
to the ESP8266 Thing and then to my data.sparkfun.com server, how can I do that?
i managed to get the ISL29125 send the data it reads from the ISL29125 Thing analog and digital pins to the sparkfun web server using the basic example at:
Hookup Guide ESP
im trying to connect the ISL29125 to the ESP8266 directly.
I got sensor working with the Uno.
I combined the two example codes of the sensor and the ESP into the following code and connected it as follows:
GND in ESP -> GND in sensor
3v3 in ESP -> 3.3v in sensor
SDA in ESP -> SDA in sensor
SCL in ESP -> SCL in sensor
It outputs only gibrish when I look at the COM port serial monitor that programs the ESP,so I cannot debug it.
I expected it to send data to my data.sparkfun.com but I couldn’t see anything there and this is my only indicator to know if it works.

CODE:

Code: Select all// Include the ESP8266 WiFi library. (Works a lot like the
// Arduino WiFi library.)
#include <ESP8266WiFi.h>
// Include the SparkFun Phant library.
#include <Phant.h>
#include <Wire.h>
#include "SparkFunISL29125.h"

// Declare sensor object
SFE_ISL29125 RGB_sensor;

//////////////////////
// WiFi Definitions //
//////////////////////
const char WiFiSSID[] = "HUJI-guest";
const char WiFiPSK[] = "";

/////////////////////
// Pin Definitions //
/////////////////////
const int LED_PIN = 5; // Thing's onboard, green LED
const int ANALOG_PIN = A0; // The only analog pin on the Thing
const int DIGITAL_PIN = 12; // Digital pin to be read

////////////////
// Phant Keys //
////////////////
const char PhantHost[] = "data.sparkfun.com";
const char PublicKey[] = "VGXgLV9vpvUm0GGwK1mD";
const char PrivateKey[] = "9YgZKMpx2xSkVeeWaqkG";

/////////////////
// Post Timing //
/////////////////
const unsigned long postRate = 12000;
unsigned long lastPost = 0;

void setup()
{
  // Initialize serial communication
  Serial.begin(115200);
Wire.begin();
  // Initialize the ISL29125 with simple configuration so it starts sampling
      Serial.println("serial began");
  if (RGB_sensor.init())
  {
    Serial.println("Sensor Initialization Successful\n\r");
  }
  initHardware();
  connectWiFi();
  digitalWrite(LED_PIN, HIGH);
}

void loop()
{
  if (lastPost + postRate <= millis())
  {
    if (postToPhant())
      lastPost = millis();
    else
      delay(100);
  }
}

void connectWiFi()
{
  byte ledStatus = LOW;

  // Set WiFi mode to station (as opposed to AP or AP_STA)
  WiFi.mode(WIFI_STA);

  // WiFI.begin([ssid], [passkey]) initiates a WiFI connection
  // to the stated [ssid], using the [passkey] as a WPA, WPA2,
  // or WEP passphrase.
  WiFi.begin(WiFiSSID, WiFiPSK);

  // Use the WiFi.status() function to check if the ESP8266
  // is connected to a WiFi network.
  while (WiFi.status() != WL_CONNECTED)
  {
    // Blink the LED
    digitalWrite(LED_PIN, ledStatus); // Write LED high/low
    ledStatus = (ledStatus == HIGH) ? LOW : HIGH;

    // Delays allow the ESP8266 to perform critical tasks
    // defined outside of the sketch. These tasks include
    // setting up, and maintaining, a WiFi connection.
    delay(100);
    // Potentially infinite loops are generally dangerous.
    // Add delays -- allowing the processor to perform other
    // tasks -- wherever possible.
  }
}

void initHardware()
{
  Serial.begin(115200);
  pinMode(DIGITAL_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);
  // Don't need to set ANALOG_PIN as input,
  // that's all it can be.
}

int postToPhant()
{
  // LED turns on when we enter, it'll go off when we
  // successfully post.
  digitalWrite(LED_PIN, HIGH);

  // Declare an object from the Phant library - phant
  Phant phant(PhantHost, PublicKey, PrivateKey);

  // Do a little work to get a unique-ish name. Append the
  // last two bytes of the MAC (HEX'd) to "Thing-":
  uint8_t mac[WL_MAC_ADDR_LENGTH];
  WiFi.macAddress(mac);
  String macID = String(mac[WL_MAC_ADDR_LENGTH - 2], HEX) +
                 String(mac[WL_MAC_ADDR_LENGTH - 1], HEX);
  macID.toUpperCase();
  String postedID = "!Thing!-" + macID;

  // Add the four field/value pairs defined by our stream:
 int data [3];
 getData(data);
         // send data only when you receive data:
         //String incomingByte;   // for incoming serial data
       // if (Serial.available() > 0) {
                // read the incoming byte:
                //incomingByte = Serial.readString();
  phant.add("id", postedID);
  phant.add("Red", data[0]);
  phant.add("Green", data[1]);
  phant.add("Blue", data[2]);
  phant.add("time", millis());
      //  }


  // Now connect to data.sparkfun.com, and post our data:
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(PhantHost, httpPort))
  {
    // If we fail to connect, return 0.
    return 0;
  }
  // If we successfully connected, print our Phant post:
  client.print(phant.post());

  // Read all the lines of the reply from server and print them to Serial
  while (client.available()) {
    String line = client.readStringUntil('\r');
    //Serial.print(line); // Trying to avoid using serial
  }

  // Before we exit, turn the LED off.
  digitalWrite(LED_PIN, LOW);

  return 1; // Return success
}
void getData(int pdata[])
{
  Serial.println("getting data...");
  // Read sensor values (16 bit integers)
  unsigned int red = RGB_sensor.readRed();
  unsigned int green = RGB_sensor.readGreen();
  unsigned int blue = RGB_sensor.readBlue();

  // Print out readings, change HEX to DEC if you prefer decimal output
  Serial.print("Red: "); Serial.println(red, DEC);
  Serial.print("Green: "); Serial.println(green, DEC);
  Serial.print("Blue: "); Serial.println(blue, DEC);
  Serial.println();
  pdata[0] = red;
  pdata[1] = green;
  pdata[2] = blue;

}

- Thu Mar 31, 2016 5:54 am #44567 can someone help pls?!

- Thu Mar 31, 2016 7:54 am #44572 From what I see, the issue is probably in the POST code, where there is no delay after the client.print() and since the client.available() doesn't have any character instantaneously received, your function simply terminate before getting any answers.

Code: Select allclient.print(phant.post());
while (client.available()) {
[...]


Try adding some delay there :

Code: Select allclient.print(phant.post());
delay(500);
while (client.available()) {
[...]


But, personally, I hate having such hard coded delay, I prefer having a timeout loop looking at the response :

Code: Select allclient.print(phant.post());
int timeout = millis() + 5000;
while (client.available() == 0) {
  if (timeout - millis() < 0) {
    Serial.println(">>> Client Timeout !");
    client.stop();
    return;
  }
}
while (client.available()) {
[...]


- Mon Apr 04, 2016 12:00 pm #44811

From what I see, the issue is probably in the POST code, where there is no delay after the client.print() and since the client.available() doesn't have any character instantaneously received, your function simply terminate before getting any answers.

Code: Select allclient.print(phant.post());
while (client.available()) {
[...]


Try adding some delay there :

Code: Select allclient.print(phant.post());
delay(500);
while (client.available()) {
[...]


But, personally, I hate having such hard coded delay, I prefer having a timeout loop looking at the response :

Code: Select allclient.print(phant.post());
int timeout = millis() + 5000;
while (client.available() == 0) {
  if (timeout - millis() < 0) {
    Serial.println(">>> Client Timeout !");
    client.stop();
    return;
  }
}
while (client.available()) {
[...]


I tried your solution ( i changed it to "return 0" in the last line because function has to return int) but the code still does not post to data.sparkfun site.
i also cannot see if the sensor was initialized because the Serial Monitor is full of gibberish like:

Code: Select allrrŸn€n€Œ<Ž‚Ÿn€n€

any suggestions?