2 layers50.8 × 81.3 mm
Burrboard
drogue-iot/burrboard
This repository contains prototyping boards for RH summit, aka burrboards, firmware running on the burrboard feathers, and the software around it
34 parts3Apache-2.0
2 layers27.2 × 21.1 mm
Dumbwatch
BluCodeGH/dumbwatchAn offline-first E-paper smartwatch
- Size
- 27.2 × 21.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 52
- Nets
- 51
- Pads
- 169
- Tracks, vias
- 414, 53
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 23 Oct 2022
- Updated
- 13 Apr 2024
Overview
Dumbwatch is an open-source printed circuit board by BluCodeGH, from the BluCodeGH/dumbwatch repository on GitHub, published under the MIT licence. It is a 2-layer board of 27.2 × 21.1 mm with 52 parts on 51 nets, routed with 414 tracks and 53 vias.
It is built around the MBR0530, CDBW0540-G and DMG3418L-7, with the NXV65UPR and SMF5.0A among its other parts. Its parts include 21 capacitors, 12 resistors, 7 diodes, 4 connectors and 3 ICs. It belongs with the PIC boards of this library.
Main components
5
MBR0530
SOD-1231 Independent 30V 5.5A 500mA 550mV@500mA 80uA@30V SOD-123 Schottky Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Schottky DiodesCDBW0540-G
SOD-1231 Independent 20uA@40V 40V 5.5A 500mA 510mV@500mA SOD-123 Schottky Diodes ROHSComchipSchottky Diodes
DMG3418L-7
SOT-23-55℃~+150℃ 1 N-channel 1.4W 1.5V 150mΩ@2.5V 30V 43.8pF 464.3pF 49.5pF 4A 5.5nC@4.5V SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETsNXV65UPR
TO-236AB-55℃~+150℃ 1 P-Channel 1V 2.1A 2.1W 20V 458pF 62pF 70mΩ@4.5V 70pF 8.7nC@4.5V P-Channel TO-236AB MOSFETs ROHSNexperiaMOSFETs
SMF5.0A
SOD-123FLESD And Surge Protection (TVS/ESD)hongjiacheng
README
README.mdDumbWatch - An offline-first E-paper smartwatch
Images
The final assembled watch.
Running a battery life and RTC test using a stand-in display.
Both sides of the custom PCB.
Features
Dumbwatch is designed to be minimalist, with its most notable (anti-)feature being a lack of wireless connectivity. It still packs in a few nice-to-haves though:
- Two months of battery life on a 170 mAh LiPo
- LiPo charging over USB
- An E-paper dispay driver compatible with most common displays
- Communication over USB, e.g. for setting the time or loading your calendar for the day
The board is powered by the PIC18F27J53, which has an internal RTC connected to a 32.768 kHz watch crystal. I have not observed any noticble drift in the time thus far.
Parts
52| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 4.7uF 25V | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5, C6, C9, C11, C12, C13, C14, C15 |
| 4 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R5, R12, R14 |
| 4 | 1uF 50V | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7, C8, C10, C16 |
| 3 | MBR0530 | Diode_SMD:D_SOD-123 | D1, D2, D3 |
| 2 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R11 |
| 2 | 12pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C18, C20 |
| 2 | 300R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R13 |
| 2 | 4.7uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C19, C21 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C17 |
| 1 | 0.1uF 20V | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4 |
| 1 | 0.47R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 10uF 6.3V | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | 10uH 1A | Inductor_SMD:L_1210_3225Metric_Pad1.42x2.65mm_HandSolder | L1 |
| 1 | 1M | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 249k 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
| 1 | 32.768 kHz | Crystal:Crystal_SMD_MicroCrystal_MS3V-T1R | Y1 |
| 1 | 750k 1% | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 1 | CDBW0540-G | Diode_SMD:D_SOD-123 | D5 |
| 1 | DMG3418L-7 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | EINK | Connector_FFC-FPC:Hirose_FH12-24S-0.5SH_1x24-1MP_P0.50mm_Horizontal | J3 |
| 1 | GREEN | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D7 |
| 1 | JST PH | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J4 |
| 1 | LOGO | Team_Logo:Logo_SilkScreen_5mm | G*** |
| 1 | MCP73832T-2 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | NCP115 | Package_TO_SOT_SMD:TSOT-23-5 | U2 |
| 1 | NXV65UPR | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | PIC18F27J53_ISS | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U1 |
| 1 | Programming Connector | dumbwatch:PinHeader_3x2.54_SMD_90deg | J2 |
| 1 | RED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D6 |
| 1 | SMF5.0A | Diode_SMD:D_SOD-123F | D4 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10104110_Horizontal | J1 |
Questions
How big is the Dumbwatch PCB?
It measures 27.2 × 21.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Dumbwatch use?
52 parts, built around the MBR0530, CDBW0540-G, DMG3418L-7 and NXV65UPR. 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 Dumbwatch KiCad files?
From the BluCodeGH/dumbwatch repository on GitHub, at the commit this page was made from: the board is pcb/dumbwatch.kicad_pcb and its schematic pcb/dumbwatch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Dumbwatch design in my own project?
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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