ESP32 IoT Lamp Switch (Relay)

1// ─────────────────────────────────────────
2//   BlueGrays · bluegrays.com
3//   ESP32 IoT Lamp Switch (Relay)
4// ─────────────────────────────────────────
5// The "Relay lamp" IoT template from the BlueGrays app: switch a lamp on
6// and off from your phone with a relay. Ohmi prepares the real code in the
7// app with your own device key (Workshop › Devices › Add a device); the
8// code here is an example, the device key and Wi-Fi details are
9// placeholders. Library Manager: BlueGraysIoT (with its dependencies). The
10// board only joins 2.4 GHz Wi-Fi networks. The relay switches on LOW. Only
11// wire a mains lamp with someone experienced; try with an LED first.
12//
13// Pins:
14//   GPIO26 -> Relay module IN
15//   5V, GND -> Relay module VCC, GND
16//   Relay COM -> 5V, NO -> 220 ohm -> LED anode, LED cathode -> GND
17//   Pico W: relay IN GP15
18
19/*
20 * Relay lamp · BlueGrays IoT
21 * BlueGrays · bluegrays.com
22 * Do not share this code: it contains your device key and Wi-Fi password.
23 */
24
25#include <BlueGraysIoT.h>
26
27const char *DEVICE_KEY = "YOUR_DEVICE_KEY";
28const char *WIFI_NAME = "YOUR_WIFI_NAME";
29const char *WIFI_PASSWORD = "YOUR_WIFI_PASSWORD";
30
31BlueGraysIoT bg(DEVICE_KEY);
32
33const int RELAY_PIN = 26;
34const bool RELAY_ACTIVE_LOW = true;  // most relay modules switch on LOW
35void setRelay(bool on) { digitalWrite(RELAY_PIN, (on != RELAY_ACTIVE_LOW) ? HIGH : LOW); }
36
37void setup() {
38  Serial.begin(115200);
39  pinMode(RELAY_PIN, OUTPUT);
40  setRelay(false);
41  bg.onSwitch("lamba", setRelay);
42  bg.setDebug(Serial);
43  bg.setLanguage(BG_LANG_EN);
44  bg.begin(WIFI_NAME, WIFI_PASSWORD);
45}
46
47void loop() {
48  bg.loop();  // avoid long delay() calls here
49}
50