| Component | Item | Description | Qty | Price | Distributor |
|---|---|---|---|---|---|
| U1 | NodeMCU LUA CP2102 | Wi-Fi micro-controller | 1 | ≈$4 | eBay.com |
| U2 | OLED* | display | 1 | $4.50 | eBay.com |
| SW1,SW2,SW3 | Wurth 436 331 045 822 4.7x3.5mm SMD profile | Profile pushbutton switch | 3 | ≈$.25/ea | we-online.de |
| PCB | - | Used Seeed Fusion for first batch | 1 | ≈0.50-1.00/ea | seeedstudio.com |
- * OLEDs have varying pinouts for GND/PWR depending on the supplier. There are solder jumper (SJ1 and SJ2) on the PCB that need to be soldered to match the OLED.
- Minimum cost: ≈$5 (only ESP8266)
- Cost @50 for full device: ≈$11 + manual assembly (20min/ea)