2 layers45.7 × 31.8 mm
LEDx16 board
tardate/LittleArduinoProjects
a collection of "Little Electronic & Arduino Projects", most involving electronics or an Arduino in one way or another!
36 parts803MIT
2 layers119 × 106.6 mm
Heart pcb
Ritikjindal/HeartLEDA 16-LED array built around two cascaded 74HC595 shift registers and an ESP32, controllable over BLE. Started as a perfboard prototype, then moved to a custom PCB designed in KiCad.
- Size
- 119 × 106.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 45
- Nets
- 51
- Pads
- 134
- Tracks, vias
- 166, 10
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 20 Aug 2026
- Updated
- 20 Aug 2026
Overview
Heart pcb is an open-source printed circuit board by Ritikjindal, from the Ritikjindal/HeartLED repository on GitHub. It is a 2-layer board of 119 × 106.6 mm with 45 parts on 51 nets, routed with 166 tracks and 10 vias.
It is built around the 74HC595. Its parts include 16 resistors, 16 diodes, 4 connectors, 3 switches and 2 capacitors.
Main components
1README
README.mdBluetooth-Enabled LED Array Control System
A 16-LED array built around two cascaded 74HC595 shift registers and an ESP32, controllable over BLE. Started as a perfboard prototype, then moved to a custom PCB designed in KiCad.
Three GPIO pins drive all 16 LEDs through the shift registers. Two push buttons handle mode switching and pattern selection, with BLE giving wireless control over the active pattern.
Hardware
- ESP32 (dev board)
- 2x 74HC595 shift registers (cascaded)
- 16x LEDs + current-limiting resistors
- 2x push buttons
Repo structure
heart_led.ino— firmwareheart_pcb.kicad_pro— KiCad projectheart_pcb.kicad_sch— schematicheart_pcb.kicad_pcb— PCB layoutheart_pcb_final.zip— fab-ready gerbers
Status
Prototype validated on perfboard. PCB designed in KiCad.
Parts
45| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16 |
| 16 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16 |
| 2 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2 |
| 2 | 74HC595 | Package_DIP:DIP-16_W7.62mm | U1, U2 |
| 2 | Conn_01x08 | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1, J2 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW2, SW3 |
| 1 | Conn_01x02_Pin | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J3 |
| 1 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J4 |
| 1 | SW_SPST | Button_Switch_THT:SW_DIP_SPSTx01_Slide_6.7x4.1mm_W7.62mm_P2.54mm_LowProfile | SW1 |
The 43 most common of 45 parts.
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Questions
How big is the Heart pcb PCB?
It measures 119 × 106.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Heart pcb use?
45 parts, built around the 74HC595. 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 Heart pcb KiCad files?
From the Ritikjindal/HeartLED repository on GitHub, at the commit this page was made from: the board is heart_pcb.kicad_pcb and its schematic heart_pcb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Heart pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask Ritikjindal before reusing the design.