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prototyping.md

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Prototyping

Photos of various prototypes

1. nodeMCU WeMos

  • nodeMCU is used to test the initial circuit
  • the circuit has a buzzer and a push button to mimc the bell

2. nodeMCU WeMos with Schmitt trigger

  • Super simple interrupt from sleep by pressing the bell

    void setup() {
  Serial.begin(115200);
  pinMode(BUILTIN_LED, OUTPUT);

  Serial.println('Start');
  Serial.println('Wake up!');
  digitalWrite(BUILTIN_LED, HIGH);
  delay(1000);
  digitalWrite(BUILTIN_LED, LOW);
  delay(1000);
  digitalWrite(BUILTIN_LED, HIGH);
  delay(1000);
  digitalWrite(BUILTIN_LED, LOW);
  delay(1000);
}

void loop() {
  Serial.println("Sleeping in.... 3");
  delay(100);
  Serial.println("Sleeping in.... 2");
  delay(100);
  Serial.println("Sleeping in.... 1");
  delay(100);
  ESP.deepSleep(5e6, WAKE_RF_DEFAULT);
}

  • Connect to WiFi on waking up

    #include <ESP8266WiFi.h>

const char* ssid     = "secret"; // change secret
const char* password = "secret"; // change secret

void setup() {
  Serial.begin(115200);
  delay(10);

  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  pinMode(LED_BUILTIN, OUTPUT);

  Serial.println('Start');
  Serial.println('Wake up!');
  digitalWrite(BUILTIN_LED, HIGH);
  delay(1000);
  digitalWrite(BUILTIN_LED, LOW);
  delay(1000);
  digitalWrite(BUILTIN_LED, HIGH);
  delay(1000);
  digitalWrite(BUILTIN_LED, LOW);
  delay(1000);
}

void loop() {
  Serial.println("Sleeping in.... 3");
  delay(100);
  Serial.println("Sleeping in.... 2");
  delay(100);
  Serial.println("Sleeping in.... 1");
  delay(100);
  ESP.deepSleep(5e6, WAKE_RF_DEFAULT);
}

  • Create a HTTP POST request to IFTTT

    #include <ESP8266WiFi.h>

const char* ssid     = "secret"; // change secret
const char* password = "secret"; // change secret

void setup() {
  Serial.begin(115200);
  delay(10);

  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  pinMode(LED_BUILTIN, OUTPUT);

  Serial.println('Start');
  Serial.println('Wake up!');
  digitalWrite(BUILTIN_LED, HIGH);
  delay(1000);
  digitalWrite(BUILTIN_LED, LOW);
  delay(1000);
  digitalWrite(BUILTIN_LED, HIGH);
  delay(1000);
  digitalWrite(BUILTIN_LED, LOW);
  delay(1000);
  notifyBellPressed();
}

void loop() {
  Serial.println("Sleeping in.... 3");
  delay(100);
  Serial.println("Sleeping in.... 2");
  delay(100);
  Serial.println("Sleeping in.... 1");
  delay(100);
  ESP.deepSleep(5e6, WAKE_RF_DEFAULT);
}

void notifyBellPressed() {
  WiFiClientSecure client;

  if (!client.connect("maker.ifttt.com", 443)) {
    Serial.println("connection failed");
    return;
  }

  String PostData="sample";

  // Amend "{secret}" to IFTTT web request URL
  client.println("POST /trigger/bell_pressed/with/key/{secret} HTTP/1.1");
  client.println("Host:  maker.ifttt.com");
  client.println("User-Agent: nodeMCU/1.0");
  client.println("Connection: close");
  client.println("Content-Type: text/html; charset=utf-8;");
  client.print("Content-Length: ");
  client.println(PostData.length());
  client.println();
  client.println(PostData);

  return;
}

3. ESP12

  • Refactored to use ESP12 modules for ESP8266

  • Also AP2112 is used for the voltage conversion from 5V to 3.3V