4 layers35.5 × 14.5 mm
Complete v1.0
drpykachu/Sonar-Watch
A self-designed, home-made watch intended to tell time in a funky and unique way!
225 parts23
2 layers50 × 50 mm
TestWatch
drpykachu/Sonar-Watch23A self-designed, home-made watch intended to tell time in a funky and unique way!
- Size
- 50 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 39
- Pads
- 105
- Tracks, vias
- 0, 0
- Pours
- 1
- Routed
- Not yet
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 May 2025
- Updated
- 15 Jan 2026
Overview
TestWatch is an open-source printed circuit board by drpykachu, from the drpykachu/Sonar-Watch repository on GitHub. It is a 2-layer board of 50 × 50 mm with 22 parts on 39 nets.
It is built around the ATMEGA4808-AU, DS3231MZ/V+ and RN73H1JTTD5052F50, with the 1N4148WT, BAT-HLD-003-SMT and IRLML6402 among its other parts. Its parts include 8 resistors, 3 ICs, 2 capacitors, 2 connectors and 1 transistor. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
7
ATMEGA4808-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 20MHz 256Byte 27 48KB 6KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
DS3231MZ/V+
SOIC-8-40℃~+85℃ 2.3V~5.5V Built-in I2C Temperature compensation、Backup power management and battery charging、Alarm function、Locking and tamper-proof、Periodic interrupt output SOIC-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
RN73H1JTTD5052F50
0603-55℃~+155℃ 100mW 50.5kΩ Metal Film Resistor ±1% ±50ppm/℃ 0603 Chip Resistor - Surface Mount ROHSKOA Speer ElectronicsChip Resistor - Surface Mount
1N4148WT
SOD-523-55℃~+150℃ 1.25V@150mA 100V 150mA 150mW 1uA@75V 2A 4ns Independent SOD-523 Switching Diodes ROHShongjiachengSwitching Diodes
BAT-HLD-003-SMT
SMDSMD Blade / Shrapnel Contact Battery Connectors ROHSTE ConnectivityBlade / Shrapnel Contact Battery Connectors
IRLML6402
SOT-23-55℃~+150℃ 1 P-Channel 1.3W 110pF 12nC 145pF 20V 3.7A 400mV 633pF 65mΩ@4.5V P-Channel SOT-23 MOSFETs ROHSGuangdong HottechMOSFETsRMCF0603FT300K
0603Chip Resistor - Surface MountStackpole Electronics (SEI)
README
README.mdSonar Watch
Hello all!
This project is inspired by something that I wanted to buy, but could not find online - so I decided to make it.
When the button is pressed, the watch sends out a "ping" to find the location of the hour (inner radial dot) and minute (outer radial dot), thus telling the time.
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | RN73H1JTTD5052F50 | RN73H1JTTD5052F50:RN73H1JTTD5052F50 | R1, R2, R3, R4 |
| 2 | 1N4148WT | Diode_SMD:D_SOD-523 | DB1, DB2 |
| 2 | GRM21BC81E106ME51K | GRM21BC81E106ME51K:CAPC2012X140N | C1, C2 |
| 2 | RC0201FR-074K7L | RC0201FR_074K7L:RESC0603X26N | R7, R8 |
| 1 | ATMEGA4808-AU | ATMEGA4808-AU:ATMEGA4808-AU | U2 |
| 1 | BAT-HLD-003-SMT | BAT-HLD-003-SMT:BAT_BAT-HLD-003-SMT_CUT | BT1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | Conn_01x16 | Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical | J1 |
| 1 | DS3231MZ_ | DS3231MZ:DS3231MZ_ | U3 |
| 1 | IRLML6402 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | MCP73832T-2ACI_OT | MCP73832T_2ACI_OT:SOT95P270X145-5N | CHG1 |
| 1 | RC1206FR-07120KL | RC1206FR_07120KL:RC1206FR_07120KL | R5 |
| 1 | RMCF0603FT300K | RMCF0603FT300K:RMCF0603FT300K | R6 |
| 1 | TPS7A0230PDBVR | TPS7A0230PDBVR:TPS7A0230PDBVR | U1 |
| 1 | ~ | Button_breakout:BB_B | BB_B1 |
| 1 | ~ | WL-SMCC_0402:Untitled | POGO1 |
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Questions
How big is the TestWatch PCB?
It measures 50 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TestWatch use?
22 parts, built around the ATMEGA4808-AU, DS3231MZ/V+, RN73H1JTTD5052F50 and 1N4148WT. 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 TestWatch KiCad files?
From the drpykachu/Sonar-Watch repository on GitHub, at the commit this page was made from: the board is Hardware/Previous Models/Watch Back v0.1/TestWatch.kicad_pcb and its schematic Hardware/Button v1.0/Button_Breakout.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TestWatch design in my own project?
Its repository states no licence, so its author keeps all rights: ask drpykachu before reusing the design.