2 layers103 × 30.5 mm
2 layers42.6 × 62.5 mm
Optimus
Rohan317685/OptimusThis is a PCB project that uses touchpads for triggering a led heartbeat motion! This is for Hackclub #Resolution-Hardware
- Size
- 42.6 × 62.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 7
- Pads
- 20
- Tracks, vias
- 40, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Mar 2026
- Updated
- 25 Mar 2026
Overview
Optimus is an open-source printed circuit board by Rohan317685, from the Rohan317685/Optimus repository on GitHub, published under the MIT licence. It is a 2-layer board of 42.6 × 62.5 mm with 9 parts on 7 nets, routed with 40 tracks and 0 vias.
Its parts include 2 resistors, 2 diodes, 2 transistors, 2 connectors and 1 capacitor.
README
README.mdOptimus
This is a LED blinky sort of, it uses a capacitor for a hearbeat like effect where it dim's down after removing your finger from the two pin's.
I made this because it was unique and I was really curious on how electricty travelled through the human body.
I'm using a extra pair of 2 pin's where you basically keep your finger ontop of the 2 pin's and essentially your finger act's as a resistor and trigger's the darlington pair transistors which let current through so it can light up the lighbulbs!
Simulation
It work's using a Darlington pair which essentially amplifies the signal to the transistor's so when you keep your finger which is represented by the 10m resistor the current travel's through and trigger's the darlington pair which then make's the current flow through to the led's, when you take your finger of the capacitor releases excess energy which then create's a sort of dimming effect for a couple of second's!
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Schematic
PCB
Thank's @shadow and @cookie with coffee for helping me in the huddle! Also thx @rudy for the amazing guide!
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R2 |
| 2 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2 |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 2 | Q_NPN_BCE | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q3, Q4 |
| 1 | 100nf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1 |
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Questions
How big is the Optimus PCB?
It measures 42.6 × 62.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Optimus use?
9 parts. 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 Optimus KiCad files?
From the Rohan317685/Optimus repository on GitHub, at the commit this page was made from: the board is src/kicad/Optimus.kicad_pcb and its schematic src/kicad/Optimus.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Optimus design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).