2 layers24.1 × 17.3 mm
Ring Watch V1
juansala/ring-watch
A watch that fits on your finger. Features an ATtiny85 and the PCF8523 real-time clock IC to change the color of an RGB LED based on the time of day.
15 parts
2 layers65 × 74.5 mm
- Size
- 65 × 74.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 70
- Pads
- 250
- Tracks, vias
- 493, 55
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 9 Mar 2018
- Updated
- 14 Mar 2024
Overview
Pi hat is an open-source printed circuit board by TheCacophonyProject, from the TheCacophonyProject/pi-hat repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 65 × 74.5 mm with 62 parts on 70 nets, routed with 493 tracks and 55 vias.
It is built around the ATTINY85-20SU, MAX485ED and AP2210N-3.3TRG1, with the PCF8523T among its other parts. Its parts include 18 capacitors, 14 resistors, 8 connectors, 6 ICs and 4 transistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
4
ATTINY85-20SU
SOIC-8-208mil-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH SOIC-8-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
MAX485ED
SOP-8-40℃~+85℃ 1 1 1mA 32 4.75V~5.25V 5Mbps Half-Duplex Transceiver ±8kV SOP-8 RS-485 / RS-422 ICs ROHSHTCRS-485 / RS-422 ICs
AP2210N-3.3TRG1
SOT-23-40℃~+125℃@(Tj) 1 13.2V 1uA 250mV@(300mA) 3.3V 300mA 75dB@(100Hz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-23 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
PCF8523T
SOIC8Real-Time Clock (RTC) and calendarNXP SemiconductorsUncategorised
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100K | Resistors_SMD:R_0603 | R3, R7, R8, R10, R15, R17 |
| 5 | 10uF | Capacitors_SMD:C_0805 | C2, C3, C5, C19, C20 |
| 5 | 2.2uF | Capacitors_SMD:C_0603 | C1, C6, C7, C8, C9 |
| 3 | 22uF | Capacitors_SMD:C_0805 | C13, C14, C15 |
| 3 | FIDUCIAL | Fiducials:Fiducial_1mm_Dia_2.54mm_Outer_CopperTop | FID1, FID2, FID3 |
| 3 | Q_NMOS_GSD | TO_SOT_Packages_SMD:SOT-23 | Q1, Q2, Q5 |
| 2 | 100nF | Capacitors_SMD:C_0805 | C4, C16 |
| 2 | 10K | Resistors_SMD:R_0603 | R4, R18 |
| 2 | 10uF | Capacitors_SMD:C_0603 | C17, C18 |
| 2 | 1K | Resistors_SMD:R_0603 | R1, R9 |
| 2 | 470R | Resistors_SMD:R_0603 | R5, R6 |
| 2 | Mounting_Hole | Mounting_Holes:MountingHole_3mm_Pad | MK1, MK2 |
| 1 | 1.5uH | pi-hat-footprints:ETQP3MxxxKVP | L2 |
| 1 | 120R | Resistors_SMD:R_0603 | R2 |
| 1 | 1220 | pi-hat-footprints:CR1220 | BT1 |
| 1 | 270uF | Capacitors_THT:CP_Radial_D8.0mm_P3.50mm | C11 |
| 1 | 32.768 | Crystals:Crystal_SMD_SeikoEpson_MC306-4pin_8.0x3.2mm | Y1 |
| 1 | 634K | Resistors_SMD:R_0603 | R12 |
| 1 | AP2210N-3.3TRG1 | TO_SOT_Packages_SMD:SOT-23 | U3 |
| 1 | ATTINY85-20SU | Housings_DIP:DIP-8_W7.62mm_Socket | U4 |
| 1 | Conn_01x02 | Connectors_JST:JST_XH_B02B-XH-A_02x2.50mm_Straight | J6 |
| 1 | Conn_01x04 | Connectors_JST:JST_XH_B04B-XH-A_04x2.50mm_Straight | J2 |
| 1 | Conn_01x04 | Connectors_JST:JST_PH_B4B-PH-K_04x2.00mm_Straight | J8 |
| 1 | Conn_01x08 | Connectors_JST:JST_XH_B08B-XH-A_08x2.50mm_Straight | J4 |
| 1 | D_Zener | Diodes_SMD:D_SOD-323 | D1 |
| 1 | Fuse | Resistors_SMD:R_0603_HandSoldering | F1 |
| 1 | Jack-DC | Connectors:BARREL_JACK | J3 |
| 1 | LED_RED | LEDs:LED_0603 | D2 |
| 1 | LOGO | pi-hat-footprints:logo | G*** |
| 1 | MAX485E | Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm | U1 |
| 1 | MAX98357 | Housings_DFN_QFN:QFN-16-1EP_3x3mm_Pitch0.5mm | U2 |
| 1 | PCF8523 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U5 |
| 1 | Q_PMOS_DGS | digikey-footprints:IRF9310PbF | Q3 |
| 1 | Raspberry_Pi_2_3 | Pin_Headers:Pin_Header_Straight_2x20_Pitch2.54mm | J1 |
| 1 | TPS630701 | pi-hat-footprints:TPS63070 | U7 |
| 1 | USB_B | Connector_USB:USB_B_Horizontal | J5 |
| 1 | USB_OUT | Connector_USB:USB_A_Horizontal | J7 |
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Questions
How big is the Pi hat PCB?
It measures 65 × 74.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pi hat use?
62 parts, built around the ATTINY85-20SU, MAX485ED, AP2210N-3.3TRG1 and PCF8523T. 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 Pi hat KiCad files?
From the TheCacophonyProject/pi-hat repository on GitHub, at the commit this page was made from: the board is pi-hat.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pi hat design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).