Reference

 FISH OPERATING RANGES

Guppy:
Temperature range: 22°C to 28°C
pH range: 6.8 to 7.8

Goldfish:
Temperature range: 18°C to 24°C
pH range: 7.0 to 8.4

Tetra:
Temperature range: 22°C to 27°C
pH range: 6.0 to 7.5

HARDWARE CONNECTIONS

Temperature Sensor (DS18B20):
VCC connected to 3.3V
GND connected to GND
DATA connected to GPIO 4
A 4.7kΩ pull-up resistor is placed between DATA and 3.3V

Ultrasonic Sensor (HC-SR04):
VCC connected to 5V
GND connected to GND
TRIG connected to GPIO 18
ECHO connected to GPIO 19 through a voltage divider

Relay Module (ESP32 Control Pins):
Channel 1 (Heater) connected to GPIO 26
Channel 2 (Fan) connected to GPIO 25
Channel 3 (Drain Pump) connected to GPIO 33
Channel 4 (Fill Pump) connected to GPIO 32

OLED Display (I2C):
VCC connected to 3.3V
GND connected to GND
SDA connected to P21
SCL connected to P22
I2C address 0x3C

pH Sensor:
VCC connected to 5V
GND connected to GND
Analog output connected to GPIO 34

Servo Motor:
VCC connected to 5V
GND connected to GND
GPIO 27

IoT 

#define BLYNK_AUTH_TOKEN    "YiedpE6mnXecXESM-sawyNr_SDkQ-NH9"

#define BLYNK_TEMPLATE_ID "TMPL5Q_5dwQKJ"

#define BLYNK_TEMPLATE_NAME "AquariumSystem"

Sensor Readings

V0 → Temperature (°C) → Double

V1 → Water Level (cm) → Double

V2 → pH → Double

Relay Status Indicators

V3 → Heater State → Integer (0/1)

V4 → Fan State → Integer (0/1)

V5 → Pump OUT → Integer (0/1)

V6 → Pump IN → Integer (0/1)

Fish Mode Control

V7 → Fish Type Selector → Integer (0–2)

Fish Mapping:
0 = Tetra
1 = Goldfish
2 = Guppy

Fish Condition Ranges 

V8 → Temp Min → Double

V9 → Temp Max → Double

V11 → pH Min → Double

V12 → pH Max → Double

Control Buttons

V20 → Start Water Change → Push Mode

V23 → Top-Up Water → Push Mode

V30 → Manual Feed → Push Mode

Manual Controls

V41 → Manual Pump OUT → Switch Mode

V42 → Manual Pump IN → Switch Mode

Emergency Control

V40 → Kill Switch → Switch Mode

Ultrasonic calibration

Tank empty = 12.32 cm

Tank with water = 3.0 cm

Ph Sensor ca;ibration

pH 7 voltage = 1.610 V

pH 4 voltage = 1.237 V

Slope = 8.042

Formula:

pH = 7 + 8.042 × (voltage − 1.610)

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