Hi All,
I'm putting together a code to extract colour data from a webpage and light up 4 LEDs to reflect the colours.
The current data is [green,blue], which should show 2 green LEDs and 2 blue. Alternatively it could be 3 colours (e.g. [green,blue,red]) which would need to show 2 of the first colour and 1 of the other two.
At the moment only the first 2 LEDs are lighting up.
Can anyone help with this issue? I've got an idea of where the issue is in the code, but not the solution.
Worth noting as well that I have tested the neopixels with a test code, and all 4 neopixels work fine.
Thanks
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <WiFiUdp.h>
#include <Adafruit_NeoPixel.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>
#include <WiFiClient.h>
#include <SPI.h>
// Change to suit your number of pixels and output pin on the ESP8266
#define PIN D3
#define NUMPIXELS 4
// Change to add in your WiFi SSID, Password & NODE_RED Server IP
const char* NODE_RED_HOST_IP = "http://XXXXXXXXXXXXXXXXX";
const char* ssid = "XXXXXXXXXXXXX";
const char* password = "XXXXXXXXXXX";
// Adafruit NeoPixel initilisation string
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
// Define some standard colours for easier reference later
const uint32_t redPixel = pixels.Color(255, 0, 0);
const uint32_t greenPixel = pixels.Color(0, 255, 0);
const uint32_t bluePixel = pixels.Color(0, 0, 255);
const uint32_t whitePixel = pixels.Color(255, 255, 255);
const uint32_t unlitPixel = pixels.Color(0, 0, 0);
const uint32_t dimWhitePixel = pixels.Color(255, 255, 255);
HTTPClient http;
WiFiClient client;
void setup() {
// Boot up ESP8266, setup serial comms and try to connect to wifi
Serial.begin(115200);
Serial.println("Booting Up");
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.waitForConnectResult() != WL_CONNECTED) {
Serial.println("Connection to WiFi Failed! Retrying...");
delay(5000);
}
// Set LED colour to dim white when booted and connected to your wifi with a valid IP, print the IP to serial
Serial.print("IP Address:");
Serial.println(WiFi.localIP());
pixels.begin();
pixels.setPixelColor(0, dimWhitePixel);
pixels.show();
}
void loop() {
// Connect to the NODE_RED server and pull a result, show red LED if this fails
const int httpPort = 1880;
// Connect to the NODE_RED bins webpage, change to suit your IP and Bins webpage address
if (! http.begin(client, "http://XXXXXXXXXXXXXXXXXXXX")) {
Serial.println("Connection Failed To " + String(NODE_RED_HOST_IP));
// If we cant connect, show 1 pixel red to indicate an error
pixels.setPixelColor(0, redPixel);
} else {
// If we can connect to NODE_RED, start a pull of data from NODE_RED server
Serial.print("Doing Get: ");
int httpCode = http.GET();
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
// Check we're getting a HTTP Code 200
if (httpCode = HTTP_CODE_OK) {
String parseMe = http.getString();
//Create a memory buffer to store the JSON data
StaticJsonBuffer<300> JSONBuffer;
JsonArray& parsed = JSONBuffer.parseArray(parseMe);
// If we can connect to NODE_RED, but dont understand the returned data, set 1 pixel to red and output to serial
if (!parsed.success()) {
Serial.println("Parsing JSON Failed");
pixels.setPixelColor(0, redPixel);
pixels.show();
delay(5000);
return;
}
int arraySize = parsed.size();
int pixelIndex = 0;
static uint32_t lastColour = unlitPixel;
for (int i = 0; i < arraySize; i++) {
char jsonChar[10];
parsed[i].printTo((char*)jsonChar, parsed.measureLength() + 1);
// Parse retreived data and check for for matching colours. If webpage says Green, show Green LED, if Red, show Red, etc
if (strcmp(jsonChar, "green") == 0 ) {
pixels.setPixelColor(pixelIndex, greenPixel);
lastColour = greenPixel;
Serial.println("Set To Green");
}
if (strcmp(jsonChar, "red") == 0 ) {
pixels.setPixelColor(pixelIndex, redPixel);
lastColour = redPixel;
Serial.println("Set To Red");
}
if (strcmp(jsonChar, "blue") == 0 ) {
pixels.setPixelColor(pixelIndex, bluePixel);
lastColour = bluePixel;
Serial.println("Set To Blue");
}
if (strcmp(jsonChar, "white") == 0 ) {
pixels.setPixelColor(pixelIndex, whitePixel);
lastColour = whitePixel;
Serial.println("Set To White");
}
pixelIndex++;
}
// If only one bin value is found, repeat colour so whole bin lights up
if (arraySize == 1) {
for (int i = 0; i < NUMPIXELS; i++) {
pixels.setPixelColor(pixelIndex, lastColour);
}
}
}
Serial.println();
Serial.println("Closing Connection");
http.end();
pixels.show();
delay(30000);
