4 layers178.5 × 70 mm
2 layers31.8 × 36.8 mm
E INK Watch
DomenicHampson/EnkWatchCustom designed e-ink smartwatch with 2 weeks of battery life. Displays time, date, battery health, altitude and weather data (note: I am still in the process of assembling the PCB and writing the firmware)
- Size
- 31.8 × 36.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 53
- Nets
- 52
- Pads
- 183
- Tracks, vias
- 577, 53
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 13 Sep 2023
- Updated
- 1 May 2024
Overview
E INK Watch is an open-source printed circuit board by DomenicHampson, from the DomenicHampson/EnkWatch repository on GitHub. It is a 2-layer board of 31.8 × 36.8 mm with 53 parts on 52 nets, routed with 577 tracks and 53 vias.
It is built around the DPS310, S-1318B33-M5T1U4 and MBR0530, with the AO3418, DMG2305UX-13 and SMF5.0A among its other parts. Its parts include 24 capacitors, 11 resistors, 6 diodes, 4 ICs and 4 connectors. It belongs with the lEDs and displays and wearables boards and the PIC boards of this library.
Main components
6
DPS310
LGA-8(2x2.5)-40℃~+85℃ 0.5pa/K 1.7V~3.6V 100pa 27.6ms 30Kpa~1.2bar 500nA 6pa I2C、SPI Integrated ADC and digital interface、On-chip calibration and non-volatile storage、Standby mode、On-chip temperature output Yes LGA-8(2x2.5) Pressure Sensors ROHSInfineon TechnologiesPressure Sensors
S-1318B33-M5T1U4
SOT-23-5-40℃~+85℃@(Ta) 100mA 3.3V 5.5V Fixed Over Current Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSABLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MBR0530
SOD-1231 Independent 30V 5.5A 500mA 550mV@500mA 80uA@30V SOD-123 Schottky Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Schottky Diodes
AO3418
SOT-23-55℃~+150℃ 1 N-channel 1.5V 12nC@10V 25pF 285pF 3.8A 30V 45pF 55mΩ@10V SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsDMG2305UX-13
SOT-23-55℃~+150℃ 1 P-Channel 1.4W 10.2nC@4.5V 20V 40mΩ@4.5V、52mΩ@2.5V 5A 77pF 808pF 85pF 900mV P-Channel SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
SMF5.0A
SOD-123FLESD And Surge Protection (TVS/ESD)hongjiacheng
README
README.mdEnkWatch
Note: I am still in the process of writing the firmware and mechanical design
Custom designed e-ink smartwatch with 2 weeks of battery life! The watch uses a PIC MCU with a built in RTC module and attached to an external temperature and humidity sensor via SPI bus to display data to the user on a e-ink screen. The time/date and off-times are set, aswell as the sensors calibrated through USB 2.0 by the user through python scripts. The watch is enclosed is a 3D printed shell designed using solidworks.
Features
- 2 Week Battery Life: Use low power components and efficient firmware to maximize battery life
- Power Switching and Protection: USB power can simulatenously charge the battery and power the watch. Battery overchage protection provided by a management IC and over discharge protection via mosfet controlled by the PIC.
- USB 2.0 Communication: User can ineract with the MCU through USB to set the time/date, calibrate the altitude sensor and determine at which times to power down their watch (for greater battery life).
Parts
53| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 4.7uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C7, C8, C12, C13, C17, C19, C21, C22, C23 |
| 8 | 1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9, C10, C14, C15, C16, C18, C20, C24 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R4, R10 |
| 3 | MBR0530 | Diode_SMD:D_SOD-123 | D4, D5, D6 |
| 2 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C11 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C5, C6 |
| 2 | 7pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4 |
| 1 | 0.47R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | 10uH | Inductor_SMD:L_1210_3225Metric_Pad1.42x2.65mm_HandSolder | L1 |
| 1 | 150R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5 |
| 1 | 32.768kHz | e-ink:XTAL_FC-135R_32.7680KA-AG0 | Y1 |
| 1 | 328k 0.1% | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6 |
| 1 | 340k 0.1% | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8 |
| 1 | 510k 0.1% | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9 |
| 1 | 820k 0.1% | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
| 1 | AO3418 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | Conn_01x04_Female | e-ink:HARWIN_M20-7910442R | J1 |
| 1 | DMG2305UX-13 | e-ink:SOT91P240X110-3N | Q1 |
| 1 | DPS310 | e-ink:XDCR_DPS310 | U2 |
| 1 | EINK | e-ink:PANASONIC_AYF532435 | J4 |
| 1 | JST PH | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J3 |
| 1 | LED_Small | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | MCP73831-2-OT | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | PIC18F27J53_ISS | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U1 |
| 1 | S-1318B33-M5T1U4 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | SD103AW-13-F | Diode_SMD:D_SOD-123 | D2 |
| 1 | SMF5.0A | Diode_SMD:D_SOD-123F | D3 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex-105017-0001 | J2 |
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Questions
How big is the E INK Watch PCB?
It measures 31.8 × 36.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the E INK Watch use?
53 parts, built around the DPS310, S-1318B33-M5T1U4, MBR0530 and AO3418. 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 E INK Watch KiCad files?
From the DomenicHampson/EnkWatch repository on GitHub, at the commit this page was made from: the board is E-INK Watch/E-INK Watch.kicad_pcb and its schematic E-INK Watch/E-INK Watch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the E INK Watch design in my own project?
Its repository states no licence, so its author keeps all rights: ask DomenicHampson before reusing the design.