MartinCowen/countdown-timer-hardwareChild-friendly Countdown Timer: KiCad projects for PCB and Front Panel
Countdown timer is an open-source printed circuit board by MartinCowen, from the MartinCowen/countdown-timer-hardware repository on GitHub, published under the MIT licence. It is a 2-layer board of 165 × 135 mm with 111 parts on 124 nets, routed with 1,058 tracks and 174 vias.
It is built around the ULN2003, TLV76133DCY and BAT54A, with the BC847 and BCP51 among its other parts. Its parts include 48 resistors, 14 capacitors, 14 diodes, 9 switches and 8 transistors. It belongs with the STM32 boards of this library.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 47k | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R7, R8, R10, R11, R12, R13, R14, R15, R16, R40 +1 |
| 10 | LED | LED_THT:LED_D5.0mm_FlatTop | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 |
| 8 | 10k | Resistor_SMD:R_0805_2012Metric | R39, R42, R43, R44, R45, R46, R47, R48 |
| 8 | 62 | Resistor_SMD:R_0805_2012Metric | R30, R31, R32, R33, R34, R35, R36, R37 |
| 7 | 100n | Capacitor_SMD:C_0805_2012Metric | C5, C6, C7, C8, C12, C13, C14 |
| 7 | 47 | Resistor_SMD:R_0805_2012Metric | R17, R18, R19, R20, R21, R22, R23 |
| 7 | D6R00 F1 LFS | timer_footprints:CK_D6 | SW1, SW2, SW3, SW4, SW5, SW6, SW7 |
| 5 | 4u7 | Capacitor_SMD:CP_Elec_4x5.4 | C1, C2, C3, C4, C9 |
| 4 | 1k | Resistor_SMD:R_0805_2012Metric | R24, R25, R26, R27 |
| 4 | BAT54A | Package_TO_SOT_SMD:SOT-323_SC-70 | D19, D20, D21, D22 |
| 4 | BC847 | Package_TO_SOT_SMD:SOT-323_SC-70 | Q5, Q6, Q7, Q8 |
| 4 | BCP51 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | Q1, Q2, Q3, Q4 |
| 4 | SA08-11SURKWA | timer_footprints:SA08-11SURKWA | DS1, DS2, DS3, DS4 |
| 3 | MountingHole | MountingHole:ToolingHole_1.152mm | H1, H2, H3 |
| 3 | ULN2003 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U2, U3, U4 |
| 2 | 1u | Capacitor_SMD:C_0805_2012Metric | C10, C11 |
| 2 | 220 | Resistor_SMD:R_0805_2012Metric | R28, R29 |
| 1 | 0 | Resistor_SMD:R_0805_2012Metric | R41 |
| 1 | 120 | Resistor_SMD:R_0805_2012Metric | R49 |
| 1 | Conn_ARM_JTAG_SWD_10 | Connector_PinHeader_1.27mm:PinHeader_2x05_P1.27mm_Vertical_SMD | J1 |
| 1 | D6R40 F1 LFS | timer_footprints:CK_D6 | SW8 |
| 1 | STM32C031C6Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SW_DIP_x08 | Package_DIP:DIP-16_W7.62mm | SW9 |
| 1 | Speaker | timer_footprints:CMS-151504-SMT-TR | LS1 |
| 1 | TLV76133DCY | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U5 |
| 1 | USART1Tx | TestPoint:TestPoint_Pad_D1.5mm | TP1:USART1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10118194-0001LF_Horizontal | J2 |
| 1 | drv_option | TestPoint:TestPoint_Pad_D1.5mm | TP2:drv_option1 |
| 1 | wake | TestPoint:TestPoint_Pad_D1.5mm | TP3:wake1 |
It measures 165 × 135 mm and has 2 copper layers, 1.6 mm thick.
111 parts, built around the ULN2003, TLV76133DCY, BAT54A and BC847. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the MartinCowen/countdown-timer-hardware repository on GitHub, at the commit this page was made from: the board is timer_pcb/countdown_timer.kicad_pcb and its schematic frontpanel_pcb/timer_frontpanel.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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