Aquarium controller

Arduino Nano R3

Tactile Switch, Top Actuated

DC-DC Buck Step-down Power Supply Module 5V

Arduino IDE

DS3231M - ±5ppm, I2C Real-Time Clock

<h3 >This aquarium controller manages the following devices, and measures the following parameters:</h3><h3 >- Water temperature (measure of value, control of heater and cooling fan (proportional PID);</h3><h3 >- Measure of ambient temperature;</h3><h3 >- Light: ON-OFF of power supply, PWM dimming, sunrise and sunset simulation (2 outputs);</h3><h3 >- Measure of CO2 circuit pressure;</h3><h3 >- CO2: ON-OFF of solenoid valve at setted times, cutoff if overpressure</h3><h3 >- ON-OFF of air pump at setted times</h3><h3 >- Fertilization: two dosing pumps controlled to dosed quantity and choice frequency (days at week);</h3><figure><img src=https://projects.arduinocontent.cc/07192ac4-1a54-4f7b-86d2-e6664a0bb888.jpeg /><figcaption> </figcaption></figure><p >The circuit was assembled on PCB and all PCB files are provided, but it can also assembled with modules linked by wires.</p><figure><img src=https://projects.arduinocontent.cc/947f92b8-ccf9-4a2f-9273-d8530c0fcba7.jpg /><figcaption> </figcaption></figure><h3 >The controller is powered by a 12Vdc 2A power supply, because the fan and the peristaltic pump I used, need 12Vdc. Arduino Nano board operate at 5V, and voltage is regulated by a step down DC-DC converter installed on the main PCB board. The timing is based on a DS3231M RTC. </h3><figure><img src=https://projects.arduinocontent.cc/1adbfd33-a14d-45b1-86ce-f36ba8922436.jpg /><figcaption> </figcaption></figure><h3 >The AC devices (heater, solenoid valve, lights, aerator) are controlled by SSR and Triac.The temperature sensors are DS18B20 in waterproof stainless steel case.</h3><figure><img src=https://projects.arduinocontent.cc/76323d9a-dc9e-47bb-92b3-baf5d1c14155.jpg /><figcaption> </figcaption></figure><h3 >The eather and the cooling fan are non controlled in ON-OFF mode, but like a proportional PID. The advantage obtained is a better regulation of the temperature. All other AC devices are operated in ON-OFF by solid state relays G3MC-202P-DC5</h3><h3 >The fan and the peristaltic pumps are powered by a 7-ch NMOS array low-side driver TPL7407LADR, that is similar to the ULN2003A, but more efficent ad low drop out voltage. Some NMOS are paralleled for increase the current capability.</h3><h3 >All informations are showed on a 2004 LCD with I2C interface, and all settings are operate by 5 tactile swithes on a separate PCB board.</h3>

Aquarium controller

A complete aquarium controller Arduino Nano based