PCB BOM Creation Assistance
Table
| Item | Qty | Estimated designator(s) | Description | Estimated package / type | Confidence | Notes |
|---|---|---|---|---|---|---|
| 1 | 1 | PCB | Custom single PCB | Long narrow FR4 board | High | Approx. controller/display board |
| 2 | 1 | U1 | Main microcontroller / controller IC | TQFP/QFP, ~32–44 pin | Medium | Marking unreadable; exact MCU unknown |
| 3 | 1 | DS1 | 4-digit 7-segment LED display | Through-hole or SMD module | High | Exact size/color/common anode/cathode unknown |
| 4 | 1 | LED1 | Red indicator LED | THT or SMD LED | High | Appears near upper center |
| 5 | 2 | SW1, SW2 | Tactile push button switches | Right-angle or vertical tactile switch | Medium | Visible near lower area |
| 6 | 1 | J1 | Multi-pin header / connector | ~6–8 pin header/socket | Medium | Top-left black connector area; pin count unclear |
| 7 | 1 | J2 | Edge/side connector or pin header pads | Through-hole header pads | Low | Left edge shows several plated holes/pads |
| 8 | 1 | U2 | Small IC / regulator / driver | SOT-23 / SOT-89 / SOT-223 class | Low | Exact function unknown |
| 9 | 1 | Q1 | Transistor / MOSFET | SOT-23 | Low | Could be switch/driver device |
| 10 | 1 | BZ1 / L1 | Buzzer, inductor, or tall round component | Cylindrical/round black component | Low | Upper-middle black part unclear |
| 11 | 8–15 | R1–R15 | SMD resistors | 0603/0805 | Medium | Includes LED/display current limiting and pull-ups |
| 12 | 6–12 | C1–C12 | SMD capacitors | 0603/0805 | Medium | Decoupling/filter capacitors |
| 13 | 1–2 | D1–D2 | Diode / protection diode | SOD-123/SMA/SOT-23 class | Low | Not clearly readable |
| 14 | 1 | X1 | Crystal/resonator, if fitted | 2-pin/3-pin SMD resonator | Low | MCU may use internal oscillator; confirm close-up |
| 15 | 3–4 | MH1–MH4 | Mounting holes | Non-plated or plated holes | High | Several holes visible |