| Component | Description | Part # | Amount | Indicative cost (NZD ex GST) | Supplier | Alternative supplier |
|---|---|---|---|---|---|---|
| PCB | 1 | $2.00 | JLCPCB | Seeed | ||
| U1 | ESP32 DevKitV1 (30 pin) | ESP-32 30PIN | 1 | $5.00 | AliExpress | |
| U2 | SCD30 CO2 NDIR sensor | 1 | $50-116 | DigiKey | AliExpress | |
| pin header (SIL 7) | 1 | $0.67 | DigiKey | Element14 | ||
| U3 | SSD1306 OLED display | 0.96 inch OLED IIC Display Module 128X64 SSD1306 | 1 (optional) | $2.50 | AliExpress | |
| D1 | red LED | HLMP-EG3A-WX0DD | 1 | $1.65 | DigiKey | Element14 |
| D2 | yellow LED | HLMP-EL3G-VX0DD | 1 | $1.47 | DigiKey | Element14 |
| D3 | green LED | LC503FPG1-30Q-A3-00001 | 1 | $0.40 | DigiKey | Element14 |
| R1,R2 | 4.7 kOhm resistor | 2 | $0.17 | DigiKey | ||
| R3, R4, R5 | 10 kOhm resistor | 3 | $0.17 | DigiKey | ||
| R6, R7 | 51 Ohm resistor | 2 | $0.17 | DigiKey | ||
| R8 | 5.1 Ohm resistor | 1 | $0.17 | DigiKey | ||
| Q1, Q2, Q3 | BC547 NPN transistor | 3 | $0.61 | DigiKey | ||
| J1 | JST-PH2 power connector | B2B-PH-K-S | 1 (optional) | DigiKey | ||
| J2 | JST-PH4 I2C connector | B4B-PH-K-S | 1 (optional) | DigiKey | ||
| J3 | USB power input | USB-B1HSW6 | 1 (optional) | $1.05 | DigiKey | |
| case | 3d printed | 1 | $2.00 | |||
| front panel | laser cut 2mm acrylic | provide these files: Panel.eps, Panel dimensions.PNG | 1 | $2-10 | Graley Plastics | |
| M3 screw | M3 x 25mm | 4 | ||||
| M3 hex nut | M3 | 4 | ||||
| 15mm stand off | 3.2mm ID, 5mm OD, 15mm length | 4 | $0.32 | DigiKey | Element14 | |
| Power Supply | old USB-A phone charger | 1 | ||||
| USB cable | micro USB or USB-B | 1 | ||||
| diffusor film | 2x3 cm | e.g. window film to diffuse the lights and make them less direct | 1 | Hardware store (can be bought by the metre) |
