frankplow/ELEC3885A robust and lightweight helmet-mounted safety camera for cycling
ELEC3885 is an open-source printed circuit board by frankplow, from the frankplow/ELEC3885 repository on GitHub. It is a 4-layer board of 33 × 77 mm with 115 parts on 134 nets, routed with 1,636 tracks and 560 vias.
It is built around the STM32F446VET6, USB3300-EZK and AP9101CK6-AYTRG1, with the TP4054, WL2803E33-5/TR and AO3401A among its other parts. Its parts include 45 capacitors, 30 resistors, 8 ICs, 8 transistors and 6 connectors. It belongs with the STM32 boards of this library.
ELEC3885: Group Design Project, group 4 project at the University of Leeds.
The objective of this project is to design and produce a prototype for a camera to mount to the helmet of a cyclist, as well as a software suite for the analysis of footage and user documentation. The camera is intended as a safety device, for example for use in legal proceedings, rather than an 'action cam'. Because of this, it should be low-cost and should not require much effort by the user, for example charging, to use.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | 100n | Capacitor_SMD:C_0402_1005Metric | C2, C3, C4, C10, C12, C13, C15, C16, C17, C18, C19, C27, C29, C36, C39, C40 +5 |
| 15 | 10k | Resistor_SMD:R_0402_1005Metric | R4, R7, R10, R12, R13, R14, R15, R16, R17, R18, R20, R26, R27, R29, R33 |
| 8 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C6, C7, C8, C9, C25, C35, C42, C43 |
| 6 | 1u | Capacitor_SMD:C_0402_1005Metric | C31, C34, C46, C47, C48, C49 |
| 4 | AO3401A | 3885:JLC_SOT-23 | Q3, Q4, Q6, Q7 |
| 3 | 10u | Capacitor_SMD:C_0402_1005Metric | C1, C37, C38 |
| 3 | 15p | Capacitor_SMD:C_0603_1608Metric | C32, C33, C45 |
| 3 | 1k | Resistor_SMD:R_0402_1005Metric | R24, R25, R28 |
| 2 | 12p | Capacitor_SMD:C_0603_1608Metric | C11, C14 |
| 2 | 2N7002 | 3885:JLC_SOT-23 | Q5, Q8 |
| 2 | 2u2 | Capacitor_SMD:C_0402_1005Metric | C20, C22 |
| 2 | 33R | Resistor_SMD:R_0402_1005Metric | R3, R6 |
| 2 | 4k7 | Resistor_SMD:R_0402_1005Metric | R30, R31 |
| 2 | AO3400A | 3885:JLC_SOT-23 | Q1, Q2 |
| 1 | 100R | Resistor_SMD:R_0402_1005Metric | R21 |
| 1 | 12k±1% | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 1k8 | Resistor_SMD:R_0603_1608Metric | R19 |
| 1 | 2.54mm | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | 24MHz | Crystal:Crystal_SMD_SeikoEpson_TSX3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 2k7 | Resistor_SMD:R_0603_1608Metric | R22 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y2 |
| 1 | 330 | Resistor_SMD:R_0402_1005Metric | R23 |
| 1 | 600R | Inductor_SMD:L_0805_2012Metric | FB1 |
| 1 | 680R | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 68R | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 6k8 | Resistor_SMD:R_0402_1005Metric | R32 |
| 1 | AP9101CK6-AYTRG1 | 3885:JLC_SOT-23-6 | U5 |
| 1 | APX803S-31SA-7 | 3885:JLC_SOT-23 | U6 |
| 1 | D_Schottky | Diode_SMD:D_SOD-323 | D4 |
| 1 | FFC | 3885:Jushuo_AFC07-S24ECA-00_1x24-1MP_P0.50_Horizontal | J5 |
| 1 | GT-TC018B-H0375-L1 | 3885:G-Switch_GT-TC018 | SW2 |
| 1 | JST-PH | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J4 |
| 1 | Jumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 1 | Micro_SD_Card_Det1 | 3885:microSD_HC_XKB_XKTF-N02-N | J3 |
| 1 | RED | 3885:Everlight_21-21S | D3 |
| 1 | SG-8018CA 24.0000M-TJHPA3 | Oscillator:Oscillator_SMD_SeikoEpson_SG8002CA-4Pin_7.0x5.0mm_HandSoldering | X2 |
| 1 | SMF6.0CA | Diode_SMD:D_SOD-123F | D1 |
| 1 | STM32F446VET6 | 3885:JLC_LQFP-100_14x14mm_P0.5mm | U8 |
| 1 | SolderJumper_3_Bridged12 | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP3 |
| 1 | TC2030 | Connector:Tag-Connect_TC2030-IDC-FP_2x03_P1.27mm_Vertical | J2 |
| 1 | TLV70012DCKR | 3885:JLC_SOT-353_SC-70-5 | U9 |
| 1 | TLV70028DCKR | 3885:JLC_SOT-353_SC-70-5 | U3 |
| 1 | TP4054 | 3885:JLC_SOT-23-5 | U2 |
| 1 | TS-1187A-B-A-B | 3885:SW_SPST_XKB_TS-1187A | SW1 |
| 1 | USB3300-EZK | 3885:JLC_QFN-32-1EP_5x5mm_P0.5mm_EP3.45x3.45mm | U1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10104110_Horizontal | J1 |
| 1 | WL2803E33-5/TR | 3885:JLC_SOT-23-5 | U4 |
The 108 most common of 115 parts.
It measures 33 × 77 mm and has 4 copper layers, 1.6 mm thick.
115 parts, built around the STM32F446VET6, USB3300-EZK, AP9101CK6-AYTRG1 and TP4054. 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 frankplow/ELEC3885 repository on GitHub, at the commit this page was made from: the board is hardware/electrical/3885.kicad_pcb and its schematic hardware/electrical/3885.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask frankplow before reusing the design.
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