HardLabs

Cygolite

smaroukis·cygolite-pcb

Cygolite PCB layout, top view — open source AVR/Arduino board by smaroukis

About the Cygolite PCB

Cygolite is an open source AVR/Arduino PCB design by smaroukis, published on GitHub. It is a 2-layer board measuring 56 × 16 mm, with 29 components from 22 distinct parts.

Its main chip is the ATTINY202-SSN-ND, from the AVR/Arduino family. Other key parts include the MCP73831T-2ACI/OT and MIC4802YME. By type, the board carries 12 resistors, 4 connectors, 3 ICs, 2 capacitors, 1 switch and 1 LED.

It belongs with the power & battery designs in this gallery.

From the project

PCB (KiCad files + libraries) of a Cygolite bike light (white LED). Constant current driver MIC4802YME set at 750mA with Li-Ion battery connector and MCP73831 Li-Ion charger. ATTiny202 used for PWM output, status LED control and button sensing. USB-C 6P (power only) connector for

PCB (KiCad files + libraries) of a Cygolite bike light (white LED). Constant current driver MIC4802YME set at 750mA with Li-Ion battery connector and MCP73831 Li-Ion charger. ATTiny202 used for PWM output, status LED control and button sensing. USB-C 6P (power only) connector for charging. UART and UDPI pin headers.

Using 0603 resistor and capacitors for best solderability + size combo.

Cygolite, from the project README
From the project README

Main components on the Cygolite

ATTINY202-SSN-NDMCP73831T-2ACI/OTMIC4802YME

Cygolite bill of materials (BOM)

29 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY202-SSN-ND
ATtiny202-SS
Microchip Technology
U1
1
MCP73831T-2ACI/OT
MCP73831-2-OT
Microchip Technology
U2
1
MIC4802YME
Microchip Technology
U3
1
USB4125-GF-A-0190
GCT
J1
1
530480310
Molex
J2
1
N/A
Conn_01x03_Socket
J3
1
N/A
Conn_01x02_Socket
J4
1
N/A
P+
SP1
1
N/A
P-
SP2
1
N/A
GND
SP3
1
N/A
5V
SP4
1
N/A
LED_K
SP6
1
FSM1LPTR
SW_Push
TE Connectivity ALCOSWITCH Switches
SW1
1
APHBM2012SURKCGKC
Kingbright
LED1
1
SMAJ5.0CA
Littelfuse
D1
2
(Generic)
4.7u
(Generic)
C1, C2
2
(Generic)
5.1K
R1, R2
2
(Generic)
0
R3, R12
3
(Generic)
2K
(Generic)
R4, R5, R8
1
(Generic)
1M
(Generic)
R6
Show 2 more
QtyPartRefs
3
(Generic)
10K
(Generic)
R7, R9, R10
1
(Generic)
6.8K
(Generic)
R11

Cygolite design files

The KiCad project lives in the smaroukis/cygolite-pcb repository on GitHub; these links point at the commit this page was built from.

Cygolite: common questions

What microcontroller does the Cygolite use?

The Cygolite is built around the ATTINY202-SSN-ND, from the AVR/Arduino family.

How big is the Cygolite PCB?

The Cygolite measures 56 × 16 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Cygolite?

29 components, from 22 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 Cygolite design files?

From the smaroukis/cygolite-pcb 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 Cygolite design in my own project?

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

Can I test firmware for the Cygolite 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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