2 layers94 × 82 mm
2 layers80 × 66 mm
Lightlink
spstack/lightlink-remote-outletCode and PCB designs for a device that can link a switched power outlet to any other outlet remotely.
- Size
- 80 × 66 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 50
- Pads
- 179
- Tracks, vias
- 376, 64
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 3 Apr 2024
- Updated
- 31 Oct 2026
Overview
Lightlink is an open-source printed circuit board by spstack, from the spstack/lightlink-remote-outlet repository on GitHub. It is a 2-layer board of 80 × 66 mm with 59 parts on 50 nets, routed with 376 tracks and 64 vias.
It is built around the PIC16F18126-I/ST, TPS56339DDC and LNK304GN, with the ES1J-LTP among its other parts. Its parts include 18 resistors, 17 capacitors, 6 diodes, 5 ICs and 5 connectors. It belongs with the PIC boards of this library.
Main components
4
PIC16F18126-I/ST
TSSOP-14TSSOP-14 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
TPS56339DDC
TSOT-23-6-40℃~+125℃@(TJ) 1 3A 4.5V~24V 500kHz 800mV~16V 98uA Adjustable Buck Buck Built-in Yes TSOT-23-6 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
LNK304GN
SMD-7P-40℃~+150℃ 170mA 62kHz~70kHz 69% 700V Flyback、Buck Non-Isolated Over Current Protection、Short Circuit Protection、Overtemperature protection (OTP) SMD-7P AC-DC Controllers and Regulators ROHSPOWER INTEGRATIONSPre-Ordered Products
ES1J-LTP
SMA(DO-214AC)-65℃~+175℃ 1.7V@1A 1A 30A 35ns 5uA@600V 600V SMA(DO-214AC) Fast Recovery / High Efficiency Diodes ROHSMicro Commercial ComponentsFast Recovery / High Efficiency Diodes
README
README.mdLight Link
A way to remotely link power outlets! This is an idea taken from the "Switcheroo" device that allows taking an existing switched power outlet and linking it wirelessly with another outlet.
Basically, you can change the location of an outlet that is already hooked up to a switch. The device uses a simple 915MHz wireless transceiver so there's no wifi/bluetooth involved. You just select the channel you want to control and if any device on that channel is powered on or off, all of the devices on that channel will follow it.
It's really useful for me in an apartment where you can't change the wiring (or just don't want to). I made about 10 of these devices to use in multiple locations where there's a switched outlet.
 |  |
Board Design
The board was designed in KiCAD and manufactured by JLC PCB. The main components are a PIC microcontroller connected to an RFM69HCW wireless transciever. There's also a relay connected to the live end of the incoming mains voltage and a small set of DIP switches for selecting which channel to transmit on.
The power system is somewhat interesting. A 12V rail is generated through a simple switching regulator that's designed to replace capacitive dropper circuits (small amount of current). This rail contains some very large electrolytic capacitors that serve to store energy and power the rest of the system for a small amount of time when mains voltage is lost. This 12V rail feeds into a second DC-DC switching regulator that powers the digital electronics. If the 12V rail drops below a threshold, a signal is sent to the PIC to transmit the "power down" command to all other LightLinks on it's channel.
| Schematic Sheet 1 | Schematic Sheet 2 |
|---|---|
 |  |
| Board Layout Front | Board Layout Back |
|---|---|
 |  |
Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6, C7, C11, C12, C13, C14, C15, C16, C17 |
| 7 | 10k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R1, R3, R4, R5, R6, R12, R14 |
| 3 | ES1J-LTP | Diode_SMD:D_SMA_Handsoldering | D2, D3, D6 |
| 2 | 100uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C4, C9 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C5 |
| 2 | 22uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C10 |
| 2 | Conn_01x01_Socket | connectors_sps:conn_harwin_S1941-46R | J4, J5 |
| 1 | 0 | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R17 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 1 | 102k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R18 |
| 1 | 13k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R7 |
| 1 | 1k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R16 |
| 1 | 1mH | Inductor_THT:L_Radial_D8.7mm_P5.00mm_Fastron_07HCP | L1 |
| 1 | 2.05k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R8 |
| 1 | 3.3k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R10 |
| 1 | 30 | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R13 |
| 1 | 31.6k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R2 |
| 1 | 34k | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R19 |
| 1 | 4.7uF | Capacitor_THT:CP_Radial_D8.0mm_P5.00mm | C1 |
| 1 | 4.7uH | inductors_sps:L_Bourns_SRN5040 | L2 |
| 1 | 43 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R9 |
| 1 | 600 | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | R11 |
| 1 | Conn_WallSocket | Connector_JST:JST_VH_B2P-VH-B_1x02_P3.96mm_Vertical | J3 |
| 1 | D_Bridge_+A-A | q_packages_sps:SOPA-4 | D1 |
| 1 | Fuse | fuse_sps:fuseholder_20x5mm_keystone_4628 | F1 |
| 1 | LNK304G | Package_DIP:PowerIntegrations_SMD-8B | U3 |
| 1 | MM3Z2V7B 2.7V | Diode_SMD:D_SOD-323_HandSoldering | D5 |
| 1 | PIC Programming Header | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | PIC16F18126 | Package_SO:SSOP-20_5.3x7.2mm_P0.65mm | U1 |
| 1 | Q_NMOS_DGS | q_packages_sps:SOT-23_FDV301 | Q1 |
| 1 | RED LED | LED_THT:LED_D3.0mm | D4 |
| 1 | RFM69HCW | RF_Module:HOPERF_RFM69HW | U2 |
| 1 | Relay_SPST-NO | relays_sps:relay_SPST_NO_panasonic_ALDP112W | K1 |
| 1 | SW_DIP_x04 | switches_sps:DIP-8_SW_Horiz_Werth | SW1 |
| 1 | SW_MEC_5G_2LED | switches_sps:switch_right_angle_228DD1S1AAFAMSC | SW2 |
| 1 | TLV3201 | Package_TO_SOT_SMD:TSOT-23-5_HandSoldering | U5 |
| 1 | TPS56339DDC | Package_TO_SOT_SMD:SOT-23-6 | U4 |
| 1 | Varistor | Varistor:RV_Disc_D7mm_W3.4mm_P5mm | RV1 |
| 1 | Wire Antenna | Connector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_Vertical | J2 |
Questions
How big is the Lightlink PCB?
It measures 80 × 66 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lightlink use?
59 parts, built around the PIC16F18126-I/ST, TPS56339DDC, LNK304GN and ES1J-LTP. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Lightlink KiCad files?
From the spstack/lightlink-remote-outlet repository on GitHub, at the commit this page was made from: the board is pcb/lightlink/lightlink.kicad_pcb and its schematic pcb/lightlink/lightlink.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lightlink design in my own project?
Its repository states no licence, so its author keeps all rights: ask spstack before reusing the design.
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