Table 1.
Main parameters of the ventilator components.
| Element | Model | Characteristics |
|---|---|---|
| Centrifugal fan | WM7040, Steady Motor® | Input voltage: 12 V |
| Idle speed: 36,000 rpm | ||
| Idle current: 2.8 A | ||
| Maximum air volume: 140 L/min | ||
| Maximum wind pressure: 7.5 kPa | ||
| Blower type: brushless DC | ||
| Electronic speed control | Aerostar 20A, Aerostar® | Input voltage: 6–15 VDC |
| Output current: 20 A (continuous) | ||
| Servo | FUTM0031, Futaba® | Input voltage: 5 VDC |
| Torque: 3.17 kg∙cm | ||
| Speed: 0.23 s/60° | ||
| Modulation: Analog | ||
| Microcontroller | ATmega2560, Microchip® | Input voltage: 5 VDC |
| Architecture: 8-bit AVR RISC | ||
| CPU speed: 16 MHz | ||
| Program memory size: 256 kB | ||
| SRAM: 8 kB | ||
| EEPROM: 4 kB | ||
| ADC: 16 inputs (10 bits) | ||
| O2 sensor | OOM111, Honeywell® | Measurement range: 0–100% |
| Output voltage: 0.6 mV/% | ||
| Pressure sensor | SM1297-008, Silicon Microstructures® | Flow range: 55 cm H2O |
| Excitation voltage: 8–15 VDC | ||
| Output voltage: 1.1 mV/cm H2O | ||
| Flow sensor | AWM92100, Honeywell® | Flow range: ±200 SCCM |
| Excitation voltage: 8–15 VDC | ||
| Output voltage: ±80 mV (non-linear) | ||
| Microcomputer | Raspberry Pi 4 Model B | Processor: Broadcom BCM2711 |
| SDRAM: 8 GB LPDDR4-3200 | ||
| Buzzer | 5117636, RS Pro® | Input voltage: 3–16 VDC |
| Sound output: 90 dB | ||
| 5 VDC power supply | SGS-25-5, RS Pro® | Output voltage: 5 VDC |
| Rated power: 25 W | ||
| 12 VDC power supply | SRS-150-12, RS Pro® | Output voltage: 12 VDC |
| Rated power: 150 W | ||
| Touchscreen monitor | TD2220, ViewSonic® | Resolution: 1920 × 1080 |
| Standing screen display size: 22″ |