4 layers115 × 55 mm
Roamr motors
uw-roamr/roamr
turn your phone into a robot running SLAM with two motors, two control boards, and a bluetooth chip
110 parts6
4 layers93 × 72 mm
Presstimer
mrksn/presstimer- Size
- 93 × 72 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 89
- Nets
- 100
- Pads
- 340
- Tracks, vias
- 753, 157
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 Jun 2026
- Updated
- 22 Sep 2026
Overview
Presstimer is an open-source printed circuit board by mrksn, from the mrksn/presstimer repository on GitHub. It is a 4-layer board of 93 × 72 mm with 89 parts on 100 nets, routed with 753 tracks and 157 vias.
It is built around the ESP32-S3-WROOM-1-N8, SFH620A-3X001 and AP7361C-33ER, with the LESD5D5.0CT1G, L8050QLT1G and 1N5819HW-7-F-01 among its other parts. Its parts include 31 resistors, 12 capacitors, 11 diodes, 10 connectors and 6 ICs. It belongs with the ESP32 boards of this library.
Main components
8
ESP32-S3-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -98.2dBm 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
SFH620A-3X001
DIP-4-55℃~+100℃ 1 1.25V 100% 250mV@10mA,2.5mA 250mW 2us 2us 320% 5.3kV 50mA 60mA 70V DC Phototransistor DIP-4 Transistor, Photovoltaic Output Optoisolators ROHSVishay IntertechnologyTransistor, Photovoltaic Output Optoisolators
AP7361C-33ER
SOT-223R-40℃~+85℃@(Ta) 1 1A 3.3V 340mV@(1A) 60uA 6V 75dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Enable、Short Circuit Protection Positive SOT-223R Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LESD5D5.0CT1G
SOD-523-55℃~+150℃ 100W 12pF 16V 1uA 5V 7A 7V Bidirectional ESD IEC 61000-4-2 SOD-523 ESD and Surge Protection (TVS/ESD) ROHSGOODWORKUncategorised
L8050QLT1G
SOT-23-55℃~+150℃ 1 NPN 100 150nA 225mW 25V 500mV 5V 800mA NPN SOT-23 Bipolar (BJT) ROHSLeshan Radio (LRC)Bipolar (BJT)
1N5819HW-7-F-01
SOD-123Schottky DiodesDiodes IncorporatedAO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
Parts
89| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | LESD5D5.0CT1G | PCM_JLCPCB:D_SOD-523 | D3, D4, D7, D8, D9, D10 |
| 5 | 10k | PCM_JLCPCB:R_0603 | R9, R14, R30, R31, R37 |
| 5 | 1k | PCM_JLCPCB:R_0603 | R3, R8, R15, R21, R36 |
| 4 | 100nF | PCM_JLCPCB:C_0603 | C5, C7, C8, C9 |
| 4 | 5k1 | PCM_JLCPCB:R_0603 | R23, R24, R25, R26 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | Screw_Terminal_01x02 | markus:DG305-5.0-02P-12-00A(H) | J1, J8, J9, J10 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP4, TP6 |
| 3 | 0 | PCM_JLCPCB:R_0805 | R4, R38, R39 |
| 3 | L8050QLT1G | Package_TO_SOT_SMD:SOT-23 | Q8, Q9, Q10 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_1.5x1.5mm | TP3, TP5, TP7 |
| 2 | 0 | PCM_JLCPCB:R_0603 | R5, R6 |
| 2 | 10uF | PCM_JLCPCB:C_0805 | C4, C13 |
| 2 | 1N5819HW-7-F | Diode_SMD:D_SOD-123 | D5, D6 |
| 2 | 1uF | PCM_JLCPCB:C_0805 | C1, C2 |
| 2 | 1uF | PCM_JLCPCB:C_0603 | C3, C12 |
| 2 | 22uF | PCM_JLCPCB:C_0805 | C10, C11 |
| 2 | 300k | Resistor_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R22, R27 |
| 2 | 47k | PCM_JLCPCB:R_0603 | R28, R29 |
| 2 | 4k7 | PCM_JLCPCB:R_0603 | R1, R2 |
| 2 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J5, J6 |
| 2 | Connector, USB-TYPE-C-16P | PCM_JLCPCB:TYPE-C-SMD_HX-TYPE-C-16PIN | J3, J11 |
| 2 | LED | PCM_JLCPCB:D_0805 | D1, D12 |
| 2 | SFH620A-3X001 | Package_DIP:DIP-4_W7.62mm | U3, U4 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_TS-1088-xR025 | SW1, SW2 |
| 1 | 100 | PCM_JLCPCB:R_0603 | R16 |
| 1 | 100k | PCM_JLCPCB:R_0603 | R17 |
| 1 | 15k | PCM_JLCPCB:R_0603 | R10 |
| 1 | 22k1 | PCM_JLCPCB:R_0603 | R32 |
| 1 | 330 | PCM_JLCPCB:R_0603 | R13 |
| 1 | 47k5 | PCM_JLCPCB:R_0603 | R34 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q6 |
| 1 | AP7361C-33ER | markus:SOT-223R | U1 |
| 1 | CP2102N-Axx-xQFN28 | Package_DFN_QFN:QFN-28-1EP_5x5mm_P0.5mm_EP3.35x3.35mm | U6 |
| 1 | Conn_ARM_SWD_TagConnect_TC2030 | Connector:Tag-Connect_TC2030-IDC-FP_2x03_P1.27mm_Vertical | J4 |
| 1 | Display 2.8" TFT LCD Touch ILI9431 SPI | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | Q5 |
| 1 | ESP32-S3-WROOM-1 | PCM_Espressif:ESP32-S3-WROOM-1 | U2 |
| 1 | Polyfuse | markus:1206L300SL16ARG | F1 |
| 1 | SK6812MINI | markus:SK6812MINI--HS-012_3.7x3.5mm | D2 |
| 1 | SSR-41FDD | markus:SSR-41FDD | U5 |
| 1 | Screw_Terminal_01x03 | markus:DG305-5.0-03P-12-00A(H) | J2 |
Questions
How big is the Presstimer PCB?
It measures 93 × 72 mm and has 4 copper layers, 1.61 mm thick.
What parts does the Presstimer use?
89 parts, built around the ESP32-S3-WROOM-1-N8, SFH620A-3X001, AP7361C-33ER and LESD5D5.0CT1G. 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.
Where can I download the Presstimer KiCad files?
From the mrksn/presstimer repository on GitHub, at the commit this page was made from: the board is presstimer.kicad_pcb and its schematic presstimer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Presstimer design in my own project?
Its repository states no licence, so its author keeps all rights: ask mrksn before reusing the design.
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