2 layers50.5 × 47.5 mm
4 layers40 × 40 mm
TinyWatch
Peer202/TinyWatchMinimalist Watch using a Attiny416 MCU
- Size
- 40 × 40 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 28
- Pads
- 97
- Tracks, vias
- 75, 2
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 17 Nov 2024
- Updated
- 16 Apr 2025
Overview
TinyWatch is an open-source printed circuit board by Peer202, from the Peer202/TinyWatch repository on GitHub. It is a 4-layer board of 40 × 40 mm with 35 parts on 28 nets, routed with 75 tracks and 2 vias.
It is built around the ATTINY416-SN, CR2032 and MMBT5551L. Its parts include 24 diodes, 3 resistors, 1 IC, 1 transistor and 1 connector. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATTINY416-SN
SOIC-20-300mil-40℃~+105℃ 1.8V~5.5V 128Byte 18 20MHz 256Byte 4KB 8 Bit AVR Built-in FLASH SOIC-20-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CR2032
-- Unclassified goods ROHSMaxellUncategorised
MMBT5551L
SOT-23-55℃~+150℃ 1 NPN 100nA 160V 250mV 300mW 600mA 6V 80 NPN SOT-23 Bipolar (BJT) ROHSonsemiBipolar (BJT)
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 24 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D3, D4, D10, D11, D12, D13, D14, D15, D16, D17, D18, D22, D23, D24 +8 |
| 2 | 50 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3 |
| 2 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | B_1, C2 |
| 1 | +3.3V | TestPoint:TestPoint_Pad_D2.0mm | TP3 |
| 1 | 5k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | ATtiny416-S | Package_DFN_QFN:QFN-20-1EP_3x3mm_P0.45mm_EP1.6x1.6mm | U1 |
| 1 | CR2032 | Battery:Keystone 1070 | BT1 |
| 1 | DEBUG | Connector_JST:JST_GH_SM05B-GHS-TB_1x05-1MP_P1.25mm_Horizontal | J1 |
| 1 | GND | TestPoint:TestPoint_Pad_D2.0mm | TP4 |
| 1 | MMBT5551L | Package_TO_SOT_SMD:SOT-23 | Q1 |
Questions
How big is the TinyWatch PCB?
It measures 40 × 40 mm and has 4 copper layers, 1.6 mm thick.
What parts does the TinyWatch use?
35 parts, built around the ATTINY416-SN, CR2032 and MMBT5551L. 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 TinyWatch KiCad files?
From the Peer202/TinyWatch repository on GitHub, at the commit this page was made from: the board is TinyWatch/TinyWatch.kicad_pcb and its schematic TinyWatch/TinyWatch.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TinyWatch design in my own project?
Its repository states no licence, so its author keeps all rights: ask Peer202 before reusing the design.
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