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Initial committ: Fish feeder and temp monitor

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This commit is contained in:
sam rolfe
2025-12-05 16:07:03 +11:00
commit 73cdedb939
4 changed files with 661 additions and 0 deletions
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.vscode/arduino.json vendored Normal file
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{
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"board": "esp32:esp32:esp32",
"port": "/dev/ttyUSB0",
"sketch": "fish_feeder.ino"
}

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README.md Normal file
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# Smart Fish Feeder (ESP32 + MQTT)
An automated aquarium feeder system based on the ESP32. It dispenses food via a motor pulse triggered by Home Assistant and continuously monitors tank temperature.
## ⚡ Features
* **Remote Feeding:** Trigger a measured feed pulse via MQTT (`tank/feed`).
* **Temperature Monitoring:** Reports water temp every 10 seconds via MQTT (`tank/temperature`).
* **Home Assistant Integration:** Fully compatible with HA Dashboards and Automation.
* **Safe Power Design:** Optically isolated power rails (ESP32 vs Motor) to prevent brownouts.
## 🛠 Hardware List
* **Microcontroller:** ESP32-D0WD-V3 (DevKitC)
* **Actuator:** DC Motor (3V-6V) with auger/screw mechanism
* **Switching:** N-Channel MOSFET (IRFZ44N)
* **Sensor:** DS18B20 Waterproof Temperature Sensor
* **Protection:**
* 1N5822 Schottky Diode (Flyback protection)
* 10kΩ Pull-down Resistor (Gate to GND)
* **Power:**
* USB-C (5V) for ESP32
* External 5V/12V DC Adapter for Motor
## 🔌 Wiring & Pinout
**⚠️ CRITICAL:** The ESP32 and Motor Power Supply must share a **Common Ground**, but 5V lines should remain separate to prevent noise/brownouts.
### GPIO Config
| Component | Pin | ESP32 GPIO | Notes |
| :--- | :--- | :--- | :--- |
| **MOSFET Gate** | Left Leg | **GPIO 27** | Use 10kΩ Pull-down to GND |
| **Temp Data** | Yellow Wire | **GPIO 14** | Requires 4.7kΩ Pull-up (if not on module) |
### Circuit Diagram (MOSFET)
* **Gate (Left):** -> GPIO 27
* **Drain (Middle):** -> Motor Negative (-)
* **Source (Right):** -> Common GND
* **Motor (+):** -> External Power 5V
* **Diode:** Across Motor Terminals (Silver stripe to +5V)
## 💻 Firmware Configuration
**Dependencies (Arduino IDE):**
* `PubSubClient` (Nick O'Leary)
* `OneWire`
* `DallasTemperature`
**Setup:**
1. Update `ssid`, `pass`, and `mqtt_server` in `fish_feeder.ino`.
2. Set `MOTOR_PIN` (Default: 27) and `TEMP_PIN` (Default: 14).
3. Upload.
## 🏠 Home Assistant Integration
### 1. Manual Configuration (YAML)
Add to `configuration.yaml` to create entities:
```yaml
mqtt:
sensor:
- name: "Fish Tank Temperature"
state_topic: "tank/temperature"
unit_of_measurement: "°C"
device_class: temperature
unique_id: "fishtank_temp_01"
button:
- name: "Feed Fish"
command_topic: "tank/feed"
payload_press: "pulse"
icon: mdi:fish
unique_id: "fishtank_feed_btn"
```
### 2. Dashboard (Lovelace)
* **Temperature:** Use a `Gauge` card linked to `sensor.fish_tank_temperature`.
* **Feeder:**

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// fish_feeder_final_fixed.ino
#include <WiFi.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>
// --- PIN DEFINITIONS ---
#define TEMP_PIN 14 // Signal wire from DS18B20
#define MOTOR_PIN 2 // Gate of MOSFET (Also the Blue LED)
// --- NETWORK SETTINGS ---
const char* ssid = "Aussie Broadband 8729";
const char* pass = "Ffdfmunfca";
const char* mqtt_server = "192.168.20.30";
WiFiClient net;
PubSubClient mqtt(net);
OneWire oneWire(TEMP_PIN);
DallasTemperature sensors(&oneWire);
void setup() {
Serial.begin(115200);
// 1. Setup Motor (Safety First)
pinMode(MOTOR_PIN, OUTPUT);
digitalWrite(MOTOR_PIN, LOW); // Ensure motor is OFF
// 2. Setup Sensor
sensors.begin();
sensors.setWaitForConversion(false);
Serial.println("--------------------------------");
Serial.println("🔌 System Start");
// 3. Connect WiFi
Serial.print("📶 Connecting to WiFi...");
WiFi.begin(ssid, pass);
int attempts = 0;
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
attempts++;
if(attempts > 20) {
Serial.println("\n❌ WiFi Failed! Check credentials.");
break;
}
}
if (WiFi.status() == WL_CONNECTED) {
Serial.printf("\n✅ WiFi Connected! IP: %s\n", WiFi.localIP().toString().c_str());
}
// 4. Setup MQTT
mqtt.setServer(mqtt_server, 1883);
mqtt.setCallback([](char* topic, byte* payload, unsigned int len) {
Serial.println("⚡ MQTT Message Received!");
triggerFeed(); // Run the feed function
});
Serial.println("✅ System Ready. Type 'pulse' in Serial Monitor to test.");
}
// Separate function to handle the motor logic
void triggerFeed() {
Serial.println("⚡ Feeding Fish...");
digitalWrite(MOTOR_PIN, HIGH);
delay(500); // Run motor for 0.5 seconds
digitalWrite(MOTOR_PIN, LOW);
Serial.println("✅ Feed Cycle Complete");
}
void loop() {
// 1. Maintain MQTT
if (WiFi.status() == WL_CONNECTED && !mqtt.connected()) {
if (mqtt.connect("fish-feeder", "mqtt-user", "sam4jo")) {
Serial.println("🔌 MQTT Reconnected");
mqtt.subscribe("tank/feed");
const char* discovery_topic = "homeassistant/sensor/fishtank_temp/config";
const char* payload =
"{"
"\"name\": \"Fish Tank Temp\","
"\"state_topic\": \"tank/temperature\","
"\"unit_of_measurement\": \"°C\","
"\"device_class\": \"temperature\","
"\"unique_id\": \"fishtank_temp_auto\""
"}";
// Publish with 'true' for Retain (so HA sees it even after restart)
mqtt.publish(discovery_topic, payload, true);
// ----------------------------------------------------
} else {
Serial.print("failed, rc=");
Serial.print(mqtt.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
mqtt.loop();
// 2. LISTEN FOR SERIAL COMMANDS (This was missing)
if (Serial.available()) {
String cmd = Serial.readStringUntil('\n');
cmd.trim(); // Remove spaces/enter keys
if (cmd == "pulse") {
triggerFeed();
}
}
// 3. Temperature Logic
static unsigned long lastTemp = 0;
if (millis() - lastTemp > 60000) { // Every 10 seconds
sensors.requestTemperatures();
float t = sensors.getTempCByIndex(0);
Serial.printf("🌡️ Temp: %.2f°C\n", t);
if (mqtt.connected() && t > -100) {
char buf[10];
snprintf(buf, sizeof(buf), "%.2f", t);
mqtt.publish("tank/temperature", buf);
}
lastTemp = millis();
}
}