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Use ESP32 to get Google Lighthouse results from REST API and show via NeoPixel
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#include <WiFi.h> | |
#include <ArduinoJson.h> | |
#include <HTTPClient.h> | |
#include <FastLED.h> | |
// Adjust these as you see need | |
const char* ssid = ""; | |
const char* password = ""; | |
const String URL = "https://www.spiegel.de"; | |
const String targetMetric = "first-contentful-paint"; | |
#define NUM_LEDS 16 | |
#define DATA_PIN 2 | |
/// adjust these end | |
const String PSI_URL = "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?category=performance&strategy=mobile&url="; | |
const String targetString = "\"" + targetMetric + "\": "; | |
CRGB leds[NUM_LEDS]; | |
unsigned long lastUpdate = -1; | |
float score; | |
String urlencode(String str) | |
{ | |
String encodedString=""; | |
char c; | |
char code0; | |
char code1; | |
char code2; | |
for (int i =0; i < str.length(); i++){ | |
c=str.charAt(i); | |
if (c == ' '){ | |
encodedString+= '+'; | |
} else if (isalnum(c)){ | |
encodedString+=c; | |
} else{ | |
code1=(c & 0xf)+'0'; | |
if ((c & 0xf) >9){ | |
code1=(c & 0xf) - 10 + 'A'; | |
} | |
c=(c>>4)&0xf; | |
code0=c+'0'; | |
if (c > 9){ | |
code0=c - 10 + 'A'; | |
} | |
code2='\0'; | |
encodedString+='%'; | |
encodedString+=code0; | |
encodedString+=code1; | |
//encodedString+=code2; | |
} | |
yield(); | |
} | |
return encodedString; | |
} | |
void setup() { | |
Serial.begin(115200); | |
FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS); | |
//LEDS.setBrightness(BRIGHTNESS); | |
WiFi.begin(ssid, password); | |
while (WiFi.status() != WL_CONNECTED) { | |
delay(1000); | |
Serial.println("Connecting..."); | |
} | |
Serial.println("Connected"); | |
} | |
void updateScore() { | |
lastUpdate = millis(); | |
fill_solid(leds, NUM_LEDS, CHSV( 160, 255, 10)); | |
FastLED.show(); | |
if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status | |
HTTPClient http; //Declare an object of class HTTPClient | |
Serial.println("Querying PageSpeed Insights API...this can take a bit! Test-URL: "); | |
String testUrl = PSI_URL + urlencode(URL); | |
Serial.println(testUrl); | |
http.setTimeout(60000); | |
http.begin(testUrl,"A1 9F 59 BC 0C 9C 8A 56 5C 3E 0F 87 E3 AA BB 96 90 CB 9A 16"); | |
int httpCode = http.GET();//Send the request | |
if(httpCode == HTTP_CODE_OK){ | |
Serial.println("Got response!"); | |
WiFiClient * stream = http.getStreamPtr(); | |
String result = ""; | |
boolean startFound = false; | |
boolean endFound = false; | |
while(http.connected()) { | |
size_t size = stream->available(); | |
char jsonBuffer[128]; // verify this | |
if(size) { | |
// read up to 128 byte | |
int c = stream->readBytes(jsonBuffer, ((size > 128) ? 128 : size)); | |
for (int i = 0; i<c; ++i) { | |
char ch = (char) jsonBuffer[i]; | |
result += ch; | |
if(result.endsWith(targetString)) { | |
Serial.println("Found start marker"); | |
startFound = true; | |
result = ""; | |
} | |
if(startFound && result.endsWith("}")) { | |
Serial.println("Found end marker"); | |
endFound = true; | |
break; | |
} | |
} | |
} | |
if(result.length() > 200 && !startFound) result = result.substring(100); | |
if(endFound) break; | |
} | |
//Serial.println("Got result"); | |
//Serial.println(result); | |
DynamicJsonDocument root(6*1024); | |
Serial.println("Parsing result"); | |
deserializeJson(root, result); | |
score = root["score"]; | |
Serial.println("Got score:"); | |
Serial.println(score); | |
} | |
else { | |
Serial.println("Got error: " + httpCode); | |
} | |
} | |
} | |
void loop() { | |
if(lastUpdate == -1 || millis() - lastUpdate > 3*60*1000) { | |
updateScore(); | |
} | |
FastLED.clear(); | |
FastLED.show(); | |
int color = 0; | |
if(score > 0.6) color = 40; | |
if(score > 0.8) color = 80; | |
int index = (millis()/150)%NUM_LEDS; | |
leds[(index)%NUM_LEDS] = CHSV( color, 255, 10); | |
leds[(index + 1)%NUM_LEDS] = CHSV( color, 255, 40); | |
leds[(index + 2)%NUM_LEDS] = CHSV( color, 255, 100); | |
leds[(index + 3)%NUM_LEDS] = CHSV( color, 255, 40); | |
leds[(index + 4)%NUM_LEDS] = CHSV( color, 255, 10); | |
FastLED.show(); | |
delay(100); | |
} |
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