2 layers50 × 28 mm
2 layers100 × 100 mm
Led matrix pcb
ph37/led_matrix_pcbPCB design with serial interface to 32x16 array of LEDs using 788BS 8x8 LED components.
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 103
- Nets
- 166
- Pads
- 465
- Tracks, vias
- 1,126, 142
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 12 Feb 2022
- Updated
- 20 Feb 2022
Overview
Led matrix pcb is an open-source printed circuit board by ph37, from the ph37/led_matrix_pcb repository on GitHub. It is a 2-layer board of 100 × 100 mm with 103 parts on 166 nets, routed with 1,126 tracks and 142 vias.
It is built around the 74HC595, 74HC238D and PMV16XNR. Its parts include 64 resistors, 10 capacitors, 10 ICs, 8 diodes and 8 transistors. It belongs with the lEDs and displays and interfaces and adapters boards of this library.
Main components
3
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers74HC238D
SOP-16SOP-16 Signal Switches, Multiplexers, Decoders ROHSMDDSignal Switches, Multiplexers, Decoders
PMV16XNR
SOT-23-55℃~+150℃ 1 N-channel 1.24nF 1.2W 125pF 145pF 20.2nC@4.5V 20V 20mΩ@4.5V 8.6A 900mV N-Channel SOT-23 MOSFETs ROHSNexperiaMOSFETs
README
README.md32x16 LED Array PCB using 788BS
KiKad 5.1 files for the design of an LED matrix. The board has been manufactured by PCB Way and is working.
The design is based around 788BS LED modules, which each contain 8x8 red LEDs in a common cathode configuration.
While physically a 16 row and 32 column design, it is logically organised as 8 rows and 64 columns. Logical row N drives physical rows N and N+8.
Uses a 3-pin header to drive a series of 74HC595 shift registers. First shift register is connected to a 74HC238 3-to-8 decoder to provide hardware enforced one-hot enable of rows. Rows are driven by a PMV16XN SMT power MOSFET to provide enough current to drive 32 LED columns.
Another eight 8-bit shift registers provide control over the 64 columns, with each column using a 680 ohm resistor to limit current. Brightness of individual LEDs can be supported externally by reprogramming the shift register and pulse-width-modulating the on-time for each column.
Notes
Board layout is intended for manufacture by PCB Way and follows PCB Way design rules. Please check compatibility with design rules for any other PCB house.
Board is a very basic design and intended for low frequency operation only. In particular there is no ground plane, which I plan to include in a future revision.
Take care with 788BS parts, I recommend testing them before soldering onto the board. The first board I've built has a short circuit inside one of 788BS components, are these are difficult to remove as the pins are underneath the package.
Errata
v01 of the board transposed rows 6 and 7 on the included 788BS symbol. This can be resolved by transposing the data for these rows in software before driving the serial interface.
Future
I plan to release C drivers for Paspberry Pi Pico. Eventually I plan to migrate the IO the Pico's programmable IO.
Parts
103| Qty | Value | Footprint | References |
|---|---|---|---|
| 64 | 680 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +48 |
| 10 | 100nF | Capacitor_THT:C_Disc_D10.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10 |
| 9 | 74HC595 | Package_DIP:DIP-16_W7.62mm | U1, U3, U4, U5, U6, U7, U8, U9, U10 |
| 8 | PMV16XN | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 |
| 1 | +3V3 | TestPoint:TestPoint_Pad_D4.0mm | +3V3 |
| 1 | 74HC238 | Package_DIP:DIP-16_W7.62mm | U2 |
| 1 | GND | TestPoint:TestPoint_Pad_D4.0mm | GND1 |
| 1 | Header_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | LED8x8_R1C1 | first:788BS | LED1 |
| 1 | LED8x8_R1C2 | first:788BS | LED2 |
| 1 | LED8x8_R1C3 | first:788BS | LED3 |
| 1 | LED8x8_R1C4 | first:788BS | LED4 |
| 1 | LED8x8_R2C1 | first:788BS | LED5 |
| 1 | LED8x8_R2C2 | first:788BS | LED6 |
| 1 | LED8x8_R2C3 | first:788BS | LED7 |
| 1 | LED8x8_R2C4 | first:788BS | LED8 |
Questions
How big is the Led matrix pcb PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Led matrix pcb use?
103 parts, built around the 74HC595, 74HC238D and PMV16XNR. 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 Led matrix pcb KiCad files?
From the ph37/led_matrix_pcb repository on GitHub, at the commit this page was made from: the board is kicad/led_matrix_pcb.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Led matrix pcb design in my own project?
Its repository states no licence, so its author keeps all rights: ask ph37 before reusing the design.
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