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ESPHome constant-current LED dimmer

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Model information

Source
Printables
Category
Home Decor
License
Creative Commons — Attribution — Share Alike
DetailsMakes & commentsRemixesCollectionsRelated

ESP CC Dimmer

A Wi-Fi constant-current LED dimmer running ESPHome.

Check https://github.com/flaviut/hardware/tree/main/esp_cc_dimmer for source code & the latest version.

Intended use

Designed to clamp onto wire shelving to dim a plant grow-light string. The 3D-printed enclosure bolts to two shelf nuts that slot behind the wire grid; two M3×20 bolts and nylock nuts pinch the shelf wire between box and nuts. The knob allows offline dimming.

Installed

Internals

Power supply

Requirements:

  • 10–56 V DC, set by the NLDD-H input range (the board silk marks the 48 V design point).

  • At least ~2 V above the LED string's forward voltage. Read your LED strip's datasheet.

  • Current capacity ≥ your LED string + 50mA for the electronics.

How it works

  • Power in (J2): 10–56 V feeds both the NLDD driver and an LX8015 buck that derives 3V3 for the MCU.

  • Dimming: the ESP32-C3 drives the NLDD's PWM dim input at 50 kHz (LEDC) — high-frequency PWM keeps the driver silent.

  • LED out (J1): constant-current string from the NLDD-H.

  • Controls: EC11 rotary encoder (turn = ±5 % brightness, press = toggle).

  • Sensing: VEML7700 ambient-light sensor on I²C (GPIO6/7).

Renders

PCB top

PCB bottom

PCB top
PCB bottom

Enclosure base

Lid

Base
Lid

Knob

Shelf nut (×2)

Knob
Shelf nut

Bill of Materials

Board: 68.25 × 52.0 mm, 2-layer.

Electronics

Refs

Qty

Value / Part

Package

Notes

U3

1

Seeed XIAO ESP32-C3

PS1

1

Mean Well NLDD-1050H

Any NLDD-350/500/700/1050H fits

U4

1

LX8015

3V3 for the MCU

U2

1

Vishay VEML7700

6-pin OPLGA

I²C ambient-light sensor

SW1

1

Alps EC11E15244G1

EC11 vertical

Rotary encoder with push switch

J1, J2

2

WJ15EDGRC-3.81-02P (clone) / Phoenix Contact MCV 1,5/2-G-3,81 — 1803426 (original)

Board-side pluggable headers (power in / LED out)

(mates J1, J2)

2

WJ15EDGK-3.81-02P-14-00A (clone) / Phoenix Contact MC 1,5/2-ST-3,81 — 1803578 (original)

Wire-side screw plug for each header

C2

1

100 µF 63 V

Radial Ø8 mm

C11

1

4.7 µF 100 V

1210

C8

1

10 µF

1210

C1, C3

2

1 µF

0603

R1, R2

2

4.7 kΩ

0603

Mechanical

Qty

Part

Notes

1

Enclosure base + lid

Print enclosure/esp_cc_dimmer_box.stl (both parts)

1

Dimmer knob

Print enclosure/dimmer_knob_textured.stl

2

Shelf nut

Print enclosure/shelf_nut.step

2

M3 × 20 mm bolt

Clamps box to shelf nuts

2

M3 nylock nut

—

Printing

  • Knob (dimmer_knob_textured.stl): 0.12 mm layers, ironed top surface. The leaf texture was applied to the base model with bumpmesh.com (dimmer_knob.bumpmesh + leaves.png).

  • Enclosure / shelf nuts: standard 0.2 mm, no supports.

Firmware

ESPHome config: esphome/esp-cc-dimmer.yaml. Provide wifi_ssid / wifi_password via secrets.yaml, then:

esphome run esphome/esp-cc-dimmer.yaml

Tags

plantsshelfmountgrowlight