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Control board

Weepfrog·96WellPlateLEDArray·control-board/control-board.kicad_pcb

Control board layout, top view — open source ESP32 board by Weepfrog

About the Control board

Control board is an open source ESP32 PCB design by Weepfrog, published on GitHub. It is a 4-layer board measuring 3 × 3 mm, with 625 components from 37 distinct parts.

Its main chip is the ESP32 left (3V3 row), from the ESP32 family. Other key parts include the PT4115, C2678753, XL1509-5.0E1 and ADS1115IDGS (DNP). By type, the board carries 199 resistors, 108 capacitors, 104 ICs, 98 diodes, 97 inductors and 12 connectors.

From the project

A 96-LED (12 across × 8 down, 9 mm pitch) deep-red 660 nm panel with per-LED dimming and per-LED temperature sensing, driven by an ESP32 DevKitC. Designed for JLCPCB fabrication + assembly; all parts chosen from the JLCPCB/LCSC library (stock verified 2026-07-13).

A 96-LED (12 across × 8 down, 9 mm pitch) deep-red 660 nm panel with per-LED dimming and per-LED temperature sensing, driven by an ESP32 DevKitC. Designed for JLCPCB fabrication + assembly; all parts chosen from the JLCPCB/LCSC library (stock verified 2026-07-13).

- ~50 W total at full drive (≈0.5 W per LED @ 256 mA, huge margin on 3 W-rated LEDs) - Per-LED PWM: one PT4115 buck constant-current channel per LED, DIM pins on six PCA9685 16-channel I2C PWM expanders (run PWM at ~244 Hz → ~10-11 usable bits) - Per-LED temperature: one 0603 NTC beside each LED, multiplexed 16:1 onto six ESP32…

Main components on the Control board

PT4115C2678753XL1509-5.0E1ADS1115IDGS (DNP)

Control board bill of materials (BOM)

625 components, 37 distinct parts — part numbers from the project's BOM.

QtyPartRefs
96
PT4115
U1, U2, U3, U4, U5, U6, U7, U8 +88
1
C2678753
PCA9685PW (0x40)
U101
1
C2678753
PCA9685PW (0x41)
U102
1
C2678753
PCA9685PW (0x42)
U103
1
C2678753
PCA9685PW (0x43)
U104
1
C2678753
PCA9685PW (0x44)
U105
1
C2678753
PCA9685PW (0x45)
U106
1
XL1509-5.0E1
U110
1
ADS1115IDGS (DNP)
U111
1
AO3400A
Q1
6
40-pin ribbon
J1, J2, J3, J4, J5, J6
1
24V IN (5.5/2.5)
J7
1
FAN 24V
J8
1
logic/analog
J9
1
ESP32 left (3V3 row)
J10
1
ESP32 right (GND row)
J11
1
24V IN
J12
1
C318884
MODE
SW1
1
C318884
UP
SW2
1
C318884
DOWN
SW3
Show 17 more
QtyPartRefs
1
C2297
PWR green
LED1
1
C2293
STATUS blue
LED2
1
C84256
FAULT red
LED3
98
SS34
D1, D2, D3, D4, D5, D6, D7, D8 +90
96
47UH
47uH
L1, L2, L3, L4, L5, L6, L7, L8 +88
1
C36414
47uH 2A+
L101
96
C125847
2.2uF 50V
C1, C2, C3, C4, C5, C6, C7, C8 +88
4
C134820
220uF 35V
C101, C102, C103, C104
1
C134514
100uF 50V
C110
1
C286136
220uF 16V
C111
6
100NF
100nF
C121, C122, C123, C124, C125, C126
96
C2930218
0.39R 1%
R1, R2, R3, R4, R5, R6, R7, R8 +88
97
100K
100k
R101, R102, R103, R104, R105, R106, R107, R108 +89
1
100R
R201
1
2.2K
2.2k
R203
2
1k
R204, R205
2
4.7K
4.7k
R210, R211

Control board design files

The KiCad project lives in the Weepfrog/96WellPlateLEDArray repository on GitHub; these links point at the commit this page was built from.

Control board: common questions

What microcontroller does the Control board use?

The Control board is built around the ESP32 left (3V3 row), from the ESP32 family.

How big is the Control board?

The Control board measures 3 × 3 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Control board?

625 components, from 37 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 Control board design files?

From the Weepfrog/96WellPlateLEDArray repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Control board design in my own project?

The repository has no license, so all rights stay with Weepfrog. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Control board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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