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LED-Relay

mikelawrence·LED-Relay

LED-Relay PCB layout, top view — open source AVR/Arduino board by mikelawrence

About the LED-Relay PCB

LED-Relay is an open source AVR/Arduino PCB design by mikelawrence, published on GitHub under the MIT license. It is a 2-layer board measuring 38.1 × 19.1 mm, with 45 components from 20 distinct parts.

Its main chip is the ATXMEGA8E5-M4U, from the AVR/Arduino family. Other key parts include the LT3014IDD and BTS70082EPAXUMA1. By type, the board carries 13 resistors, 12 capacitors, 9 connectors, 4 diodes, 3 ICs and 3 test points.

From the project

Motorcycle LED Relay replacement PCB.

There are 4 inputs to the LED Relay board: +12V - This should be connected through a fuse to the battery and should remain hot even when the trike is off. All power to the outputs comes from this wire. ACC1 - This is +12V when the bike is turned on (ignition). ACC2 - This is +12V when the LED lights should be on. GND - Chassis and negative terminal of the battery. The current software turns both outputs on when both ACC1 and ACC2 are at +12V but this can easily be changed to two independent outputs each controlled by its own ACC input. When either ACC1 off the micro-controller enters a low…

LED-Relay, from the project README
From the project README

Main components on the LED-Relay

LT3014IDDBTS70082EPAXUMA1ATXMEGA8E5-M4U

LED-Relay bill of materials (BOM)

45 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LT3014IDD
Linear Tech
U1
1
BTS70082EPAXUMA1
BTS7008-2EPA
Infineon
U2
1
ATXMEGA8E5-M4U
Atmel
U3
8
TEST_1P
J1, J2, J3, J4, J5, J6, J7, J8
1
20021121-00006C4LF
Header
Amphenol/FCi
J9
1
GND
JP1
3
TEST_1P
TP1, TP2, TP3
1
SM15T33CA
ST
D1
2
BAT54S
Nexperia
D2, D3
1
ZRC330F01TA
ZRC330
Diodes Inc.
D4
1
GRJ21BC72A105KE11L
1uF
Murata Electronics
C1
4
0.47uF
C2, C3, C7, C8
1
GCJ188R92A683KA01D
68nF
Murata Electronics
C4
6
10nF
C5, C6, C9, C10, C11, C12
1
CRCW06032M15FKEA
2.15M
Vishay
R1
2
RC0603JR-074K7L
4.7k
Yageo
R2, R3
1
CRCW06031M27FKEA
1.27M
Vishay
R4
2
RC0603JR-0710KL
10k
Yageo
R5, R6
1
RC0603FR-0747RL
47
Yageo
R7
6
47k
R8, R9, R10, R11, R12, R13

LED-Relay design files

The KiCad project lives in the mikelawrence/LED-Relay repository on GitHub; these links point at the commit this page was built from.

LED-Relay: common questions

What microcontroller does the LED-Relay use?

The LED-Relay is built around the ATXMEGA8E5-M4U, from the AVR/Arduino family.

How big is the LED-Relay PCB?

The LED-Relay measures 38.1 × 19.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the LED-Relay?

45 components, from 20 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 LED-Relay design files?

From the mikelawrence/LED-Relay repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the LED-Relay design in my own project?

Yes, under the terms of its MIT license, which mikelawrence chose for the repository.

Can I test firmware for the LED-Relay 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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