jremington:
The best approach would be to write code so that the ESP8266 can read the light sensor and upload the data.
The light sensor uses the I2C interface, which is very common and rather simple. Surely all the basics are already on the web.
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:
// 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;
}