Week 6

20/10/2026

This week I did not carry out physical work on the hardware. Instead, I focused on planning the overall logic of the system. I created a flowchart to describe how the automated aquarium system should operate once all modules are integrated.





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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 connect...
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