2 layers42.5 × 21 mm
2 layers23.9 × 19.8 mm
.watch
silardg/.watchPCB for a small watch
- Size
- 23.9 × 19.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 28
- Nets
- 48
- Pads
- 138
- Tracks, vias
- 232, 31
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 16 Jul 2019
- Updated
- 2 Oct 2021
Overview
.watch is an open-source printed circuit board by silardg, from the silardg/.watch repository on GitHub. It is a 2-layer board of 23.9 × 19.8 mm with 28 parts on 48 nets, routed with 232 tracks and 31 vias.
It is built around the E73-2G4M04S1D, LD3985M33R and MPU-6050, with the TP4056 among its other parts. Its parts include 9 capacitors, 8 resistors, 4 ICs, 4 connectors and 1 diode. It belongs with the wearables boards of this library.
Main components
4
E73-2G4M04S1D
SMD,28.7x17.5mm-40℃~+85℃ -96dBm 100m 12mA 14mA 3.3V 4dBm Bluetooth 5.0、Bluetooth 4.2 On-board PCB Antenna、IPEX interface PWM、SPI、ADC、I2C、DMA nRF51822 Chip SMD,28.7x17.5mm Bluetooth Modules ROHSChengdu Ebyte Elec TechBluetooth Modules
LD3985M33R
SOT-23-5L-40℃~+125℃@(Tj) 1 150mA 150uA 3.3V 30uVrms 50dB@(10kHz) 60mV@(150mA) 6V Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSSTMicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MPU-6050
QFN-24-EP(4x4)-40℃~+85℃ 16bit 1KB 2.375V~3.46V 5uA Accelerometer Gyroscope I2C X,Y,Z X,Y,Z ±16g ±2000dps QFN-24-EP(4x4) Accelerometers ROHSTDK InvenSenseAccelerometers
TP4056
ESOP-8-40℃~+85℃ 1 1A 35uA 4.2V 4V~6.5V Charging IC Lithium Battery Support Support 恒流充电、恒压充电、涓流充电、自动再充电、充电终止、可编程充电电流、软启动、欠压锁定 ESOP-8 Battery Management ROHSUMWBattery Management
README
README.mdProject watch with nRF
nRF, accelerometer, gyroscope and a battery charger on the footprint of the nRF module
Parts
28| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C4, C5, C7, C9 |
| 4 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R2, R6, R7 |
| 4 | 4K7 | Resistor_SMD:R_0603_1608Metric | R3, R4, R5, R8 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 1 | SK14A-SS14A | Diode_SMD:D_SMA | D1 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 2.2uF | Capacitor_SMD:C_0805_2012Metric | C8 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | BAT | Diode_SMD:D_1210_3225Metric | J2 |
| 1 | E73-2G4M04S1D | watch:E73-2G4M04S | U1 |
| 1 | LD3985M33R | watch:SOT95P280X145-5N | U3 |
| 1 | MPU-6050 | Sensor_Motion:InvenSense_QFN-24_4x4mm_P0.5mm | U2 |
| 1 | PCM12 | Button_Switch_SMD:SW_SPDT_PCM12 | SW1 |
| 1 | SERIAL | Resistor_SMD:R_0603_1608Metric | J4 |
| 1 | TP4056 | TP4056:SOP-8 | IC1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex_47346-0001 | J1 |
| 1 | VIB_MTR | Diode_SMD:D_1210_3225Metric | J3 |
Questions
How big is the .watch PCB?
It measures 23.9 × 19.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the .watch use?
28 parts, built around the E73-2G4M04S1D, LD3985M33R, MPU-6050 and TP4056. 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 .watch KiCad files?
From the silardg/.watch repository on GitHub, at the commit this page was made from: the board is watch.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the .watch design in my own project?
Its repository states no licence, so its author keeps all rights: ask silardg before reusing the design.
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