2 layers185 × 83 mm
Mass Spring Damper SysID Lab
Scalable-Open-Source-Labs/Mass-Spring-Damper-SysID-Lab
An open source Mass-Spring-Damper to assist with teaching System Identification
135 parts1MIT
4 layers105.4 × 105.4 mm
Wordclock board
jedp/wordclock-boardProgrammed via ST-Link (CLK, GND, DIO, NRST). Easy peasy!
- Size
- 105.4 × 105.4 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 100
- Nets
- 68
- Pads
- 283
- Tracks, vias
- 813, 142
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 29 Nov 2020
- Updated
- 17 Jan 2021
Overview
Wordclock board is an open-source printed circuit board by jedp, from the jedp/wordclock-board repository on GitHub. It is a 4-layer board of 105.4 × 105.4 mm with 100 parts on 68 nets, routed with 813 tracks and 142 vias.
It is built around the MAX7219M and USBLC6-2SC6. Its parts include 65 diodes, 17 capacitors, 4 ICs, 3 resistors and 2 connectors. It belongs with the STM32 boards of this library.
Main components
2
MAX7219M
SOP-24-300mil10MHz 150uA 3-Wire Serial Interface 30mA 320mA 4V~5.5V 8 Segment x 8 Digit Built-in display RAM、PWM dimming、BCD input latch function、Power-up display blanking、Lamp test function、Cascadable function SOP-24-300mil Digital Tube Drivers ROHSHGSEMIDigital Tube Drivers
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
README
README.mdNotes
STM32F04
Programmed via ST-Link (CLK, GND, DIO, NRST). Easy peasy!
External low-speed crystal oscillator (32.768kHz) enables real-time clock module to function on VBAT when VDD is disconnected.
MAX7129
Imagine the 64 LEDs are 8 7-segment LEDs.
Pin 1 DATA: Data loaded on CLK's rising edge.
Pin 12 NCS: Data is loaded into the shift register when this is low.
Pin 13 CLK.
Pins 2, 3, 5, 6, 7, 8, 10, and 11 (the DIG pins) are pulled high when switched off.
Pins 14, 15, 16, 17, 20, 21, 22, and 22 (the SEG and DP pins) are pulled low when switched off.
Note that peak current is set with an external resistor on pin 18 (R1). The
datasheet has a section on how to select the correct resistor value. Note that
you need to do this whether or not you use the intensity configuration,
because the MAX7219 will power up into a test mode with all LEDs blazing
before your configurations takes effect. You could probably burn out your
nice display by accident this way. So you can tweak the 10k resistor on R1, but
don't jump it.
Other assorted components
MCP1802: LDO voltage regulator (5V to 3V3).
USBLC6: ESD protection on the USB interface.
Parts
100| Qty | Value | Footprint | References |
|---|---|---|---|
| 64 | LED_Small | LED_SMD:LED_0603_1608Metric | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +48 |
| 7 | 0.1u | Capacitor_SMD:C_0603_1608Metric | C2, C7, C9, C10, C11, C12, C13 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 2 | 0.1u | Capacitor_SMD:C_0805_2012Metric | C14, C15 |
| 2 | 22 | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | 4.7p | Capacitor_SMD:C_0603_1608Metric | C16, C17 |
| 1 | 0.01u | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 10u | Capacitor_SMD:CP_Elec_5x4.5 | C8 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 1N5819 | Diode_SMD:D_0805_2012Metric | D65 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 4.7u | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 47u | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | Battery_Cell | Battery:BatteryHolder_Seiko_MS621F | BT1 |
| 1 | Crystal_Small | Crystal:Crystal_SMD_MicroCrystal_CC5V-T1A-2Pin_4.1x1.5mm_HandSoldering | Y1 |
| 1 | Ferrite_Bead_Small | Inductor_SMD:L_0805_2012Metric | FB1 |
| 1 | MAX7219 | Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm | U3 |
| 1 | MCP1802x-xx02xOT | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | ST-Link | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | STM32F042C4Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SW_Hour | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW1 |
| 1 | SW_Min | Button_Switch_THT:SW_Tactile_SPST_Angled_PTS645Vx83-2LFS | SW2 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U4 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex-105133-0001 | J1 |
Questions
How big is the Wordclock board PCB?
It measures 105.4 × 105.4 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Wordclock board use?
100 parts, built around the MAX7219M and USBLC6-2SC6. 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 Wordclock board KiCad files?
From the jedp/wordclock-board repository on GitHub, at the commit this page was made from: the board is layout/wordclock-board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Wordclock board design in my own project?
Its repository states no licence, so its author keeps all rights: ask jedp before reusing the design.
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