KbxBinaryClock.v4
About the KbxBinaryClock.v4 PCB
KbxBinaryClock.v4 is an open source STM32 PCB design by kbx81, published on GitHub. It is a 2-layer board measuring 127 × 114.3 mm, with 128 components from 57 distinct parts.
Its main chip is the STM32F072RBTx, from the STM32 family. Other key parts include the TLC5951, DS3234, MAX485E, DS1722 and LM74. By type, the board carries 30 resistors, 27 capacitors, 26 LEDs, 9 ICs, 7 connectors and 6 test points.
It belongs with the sensors designs in this gallery, and the repository also holds 2 earlier revisions of it.
From the project
RGB Binary Clock project files - PCB and source
RGB Binary Clock PCB project files for KiCad (v4/v5)
Detailing the process is a bit outside of what I plan to discuss here. There are plenty of resources out around the web already that will do a better job of explaining this process than I can. That said, there's not much to it -- the files you need are here and all you need to do (more or less) is upload them to your PCB fabricator of choice and, after a few days, they'll ship them to you. I've used OSHPark for the prototypes and I can assure you that they turn out fantastic (purple) boards.
Main components on the KbxBinaryClock.v4
KbxBinaryClock.v4 bill of materials (BOM)
128 components, 57 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32F072RBTx | LQFP-64_10x10mm_Pitch0.5mm | U1 |
| 3 | TLC5951 | HTSSOP-38_6.1x12.5mm_Pitch0.65mm_ThermalPad | U2, U3, U4 |
| 1 | DS3234 | SO-20_12.8x7.5mm_Pitch1.27mm | U5 |
| 1 | MAX485E | SOIC-8_3.9x4.9mm_Pitch1.27mm | U6 |
| 1 | DS1722 | SOIC-8_3.9x4.9mm_Pitch1.27mm | U7 |
| 1 | LM74 | SOIC-8_3.9x4.9mm_Pitch1.27mm | U8 |
| 1 | LD1117S33TR | TO-252-2 | U9 |
| 1 | Q_Photo_NPN | LED_D5.0mm | Q1 |
| 4 | 2N7002 | SOT-23 | Q2, Q3, Q4, Q5 |
| 1 | 8 MHz | Crystal_SMD_5032-4pin_5.0x3.2mm | Y1 |
| 1 | 32.768 KHz | Crystal_SMD_3215-2pin_3.2x1.5mm | Y2 |
| 1 | Conn_02x08_Odd_Even | Pin_Header_Straight_2x08_Pitch2.54mm | J1 |
| 1 | Conn_02x05_Odd_Even | Pin_Header_Straight_2x05_Pitch2.54mm | J2 |
| 1 | Conn_02x03_Odd_Even | Pin_Header_Straight_2x03_Pitch2.54mm | J3 |
| 1 | Conn_01x06 | Pin_Header_Straight_1x06_Pitch2.54mm | J4 |
| 1 | Jack-DC | BARREL_JACK | J5 |
| 1 | CONN_MICRO_USB_B | USB_Micro-B_Molex-105017-0001 | P1 |
| 1 | STM32_SWD_USART | Pin_Header_Straight_2x05_Pitch1.27mm_SMD | P2 |
| 1 | CR2032 | Keystone_103_1x20mm-CoinCell | BT1 |
| 1 | Buzzer | Buzzer_12x9.5RM7.6 | BZ1 |
Show 37 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~2A | Fuse_SMD2920 | F1 |
| 1 | 100K | Potentiometer_Trimmer_Vishay_TS53YJ | RV1 |
| 2 | GS3 | GS3 | SB1, SB3 |
| 3 | GS2 | GS2 | SB2, SB4, SB5 |
| 2 | SW_Push | SW_SPST_KMR2 | SW1, SW2 |
| 1 | TouchPad1 | TouchPad1 | TP1 |
| 1 | TouchPad2 | TouchPad1 | TP2 |
| 1 | TouchPad3 | TouchPad1 | TP3 |
| 1 | TouchPad4 | TouchPad1 | TP4 |
| 1 | TouchPad5 | TouchPad1 | TP5 |
| 1 | TouchPad6 | TouchPad1 | TP6 |
| 25 | LED_RGB_COMMON_ANODE | LED_D5.0mm-4 | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +17 |
| 1 | LED_Dual_AACC | LED_Cree-PLCC4_3.2x2.8mm_CCW | LED26 |
| 1 | USBLC6 | SOT-23-6 | D1 |
| 1 | 1N4148 | D_SOD-123 | D2 |
| 1 | S3A | D_SMC | D3 |
| 1 | BAT64-04 | SOT-23 | D4 |
| 1 | BAT64-02V | D_0603 | D5 |
| 2 | 10 pF | C_0805 | C1, C2 |
| 2 | 12.5 pF | C_0805 | C3, C4 |
| 14 | 100 nF | C_0805 | C5, C8, C10, C11, C12, C16, C17, C18 +6 |
| 1 | 10 nF | C_0805 | C6 |
| 1 | 1 µF | C_0805 | C7 |
| 2 | 4.7 µF | C_0805 | C9, C13 |
| 2 | 47 nF | C_0805 | C14, C15 |
| 1 | 100 µF | CP_Elec_8x10 | C23 |
| 1 | 10 µF | C_0805 | C25 |
| 1 | 470 mF | CP_Radial_D13.0mm_P5.00mm_HD1.5mm | C26 |
| 1 | 47K | R_0805 | R1 |
| 1 | 68K | R_0805 | R2 |
| 8 | 10K | R_0805 | R3, R4, R6, R7, R8, R18, R23, R24 |
| 5 | 1M | R_0805 | R5, R19, R25, R26, R27 |
| 9 | 1K | R_0805 | R9, R10, R11, R12, R13, R14, R20, R21 +1 |
| 3 | 2K7 | R_0805 | R15, R16, R17 |
| 1 | 0 | R_0805 | R28 |
| 1 | 120 | R_0805 | R29 |
| 1 | 56Ω 0.5W | R_0805 | R30 |
KbxBinaryClock.v4 design files
The KiCad project lives in the kbx81/RGBBinaryClock repository on GitHub; these links point at the commit this page was built from.
KbxBinaryClock.v4: common questions
What microcontroller does the KbxBinaryClock.v4 use?
The KbxBinaryClock.v4 is built around the STM32F072RBTx, from the STM32 family.
How big is the KbxBinaryClock.v4 PCB?
The KbxBinaryClock.v4 measures 127 × 114.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the KbxBinaryClock.v4?
128 components, from 57 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the KbxBinaryClock.v4 design files?
From the kbx81/RGBBinaryClock repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the KbxBinaryClock.v4 design in my own project?
The repository has no license, so all rights stay with kbx81. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the KbxBinaryClock.v4 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
More boards in RGBBinaryClock
Earlier revisions in the repo: kbxBinaryClock.v3, kbxBinaryClock.v2.1
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