OpenDual-Relay-Demo
About the OpenDual-Relay-Demo PCB
OpenDual-Relay-Demo is an open source PCB design by nuerolynx, published on GitHub. It is a 2-layer board measuring 20 × 30 mm, with 8 components from 8 distinct parts.
By type, the board carries 3 connectors, 2 resistors, 1 transistor, 1 relay and 1 diode.
It belongs with the iot & wireless, audio and displays & leds designs in this gallery.
From the project
Arduino UNO R4 WiFi and ESP32 prototypes for access control, automation, displays, monitoring, and Bluetooth audio.
Open OpenDual-Relay-Demo.kicadpro` in KiCad 10. This separate 20×30 mm two-layer board is fully routed, with project-local symbols and footprints. The schematic uses ordinary editable relay, transistor, diode and resistor symbols.
- Wiring and restrictions: relay-expansion.md. - Exact parts: BOM.csv. - ERC and DRC results plus plots: validation/. - Main-reader connection: J1.1 to main J5.1 GND; J1.2 to main J5.2 RELAY_EN. Leave main J5.3 unused. - Separate regulated 12V ±5% supply at J2, current limit 100mA. J3 pins 1/2/3 are NC/COM/NO.
OpenDual-Relay-Demo bill of materials (BOM)
8 components, 8 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MMBT3904LT1G onsemi | SOT-23 | Q1 |
| 1 | PCB solder holes LOGIC FROM READER J5 PCB feature | Solder2 | J1 |
| 1 | PCB solder holes REGULATED 12V INPUT PCB feature | Solder2 | J2 |
| 1 | PCB solder holes NC / COM / NO PCB feature | Solder3 | J3 |
| 1 | G5V-1 DC12 Omron | Relay_SPDT_Omron_G5V-1 | K1 |
| 1 | 1N4148W-7-F Diodes Incorporated | D_SOD-123 | D1 |
| 1 | RC0603FR-071KL 1k Yageo | R_0603_1608Metric | R1 |
| 1 | RC0603FR-07100KL 100k Yageo | R_0603_1608Metric | R2 |
OpenDual-Relay-Demo design files
The KiCad project lives in the nuerolynx/embedded-systems-lab repository on GitHub; these links point at the commit this page was built from.
OpenDual-Relay-Demo: common questions
How big is the OpenDual-Relay-Demo PCB?
The OpenDual-Relay-Demo measures 20 × 30 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the OpenDual-Relay-Demo?
8 components, from 8 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 OpenDual-Relay-Demo design files?
From the nuerolynx/embedded-systems-lab 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 OpenDual-Relay-Demo design in my own project?
The repository has no license, so all rights stay with nuerolynx. Use it as a reference, and ask the author before reusing the design.
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