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Auto dimmer

ilyushkin·auto_dimmer·pcb/AutoDimmer.kicad_pcb

Auto dimmer PCB layout, top view — open source AVR/Arduino board by ilyushkin

About the Auto dimmer PCB

Auto dimmer is an open source AVR/Arduino PCB design by ilyushkin, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 51 × 70 mm, with 46 components from 30 distinct parts.

Its main chip is the ATtiny13A-SS, from the AVR/Arduino family. Other key parts include the MCP1755S-5002ED and SGM809B-MXN3LG. By type, the board carries 19 resistors, 10 capacitors, 3 ICs, 3 diodes, 2 transistors and 2 fuses.

From the project

Automatic dimmer for IKEA NYMANE (103.569.62) lamp based on AVR ATtiny13A MCU.

If the button is held for more than 2 seconds, auto-dimming mode activates with a 20-minute countdown, during which the lamp gradually dims from the current brightness to zero. This is convenient for falling asleep without leaving the light on. The logic is somewhat similar to the dimming-out functionality of the Philips Wake-up Light alarm clock, just without all the bells and whistles.

Auto dimmer, from the project README
From the project README

Main components on the Auto dimmer

MCP1755S-5002EDATtiny13A-SSSGM809B-MXN3LG

Auto dimmer bill of materials (BOM)

46 components, 30 distinct parts.

QtyPartRefs
1
MCP1755S-5002ED
U1
1
ATtiny13A-SS
U2
1
SGM809B-MXN3LG
U3
1
BTA06-600TW
Q1
1
MMBT5551L
Q2
1
Conn_02x03_Odd_Even
J2
1
1A
F1
1
125°C
F2
2
Filter_EMI_CommonMode
FL1, FL2
1
7N511K
RV1
1
SW_Push
SW1
1
SMBJ5.0A
VD1
1
LED
LD1
2
MRA4007T3G
D1, D2
1
BAV99
D3
1
390n 400V
C1
2
150n
C2, C4
1
100u 50V
C3
1
100u 16V
C5
4
100n
C6, C8, C9, C10
Show 10 more
QtyPartRefs
1
3n
C7
2
51
R1, R2
5
330K
R3, R4, R6, R7, R13
3
1K
R5, R12, R18
1
330K
R8
2
240
R9, R15
1
9K
R10
2
510
R11, R17
2
10K
R14, R19
1
1.5K
R16

Auto dimmer design files

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

Auto dimmer: common questions

What microcontroller does the Auto dimmer use?

The Auto dimmer is built around the ATtiny13A-SS, from the AVR/Arduino family.

How big is the Auto dimmer PCB?

The Auto dimmer measures 51 × 70 mm, has 2 copper layers and is 0.89 mm thick.

How many components are on the Auto dimmer?

46 components, from 30 distinct parts. The full bill of materials is listed on this page.

Where can I download the Auto dimmer design files?

From the ilyushkin/auto_dimmer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Auto dimmer design in my own project?

Yes, under the terms of its GPL-3.0 license, which ilyushkin chose for the repository.

Can I test firmware for the Auto dimmer without the hardware?

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

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