HILO
catinella·HILO·PCB/IOlinesManagement/main.kicad_pcb
About the HILO PCB
HILO is an open source PCB design by catinella, published on GitHub. It is a 4-layer board measuring 138.4 × 80.3 mm, with 156 components from 11 distinct parts.
Other key parts include the MIC4427. By type, the board carries 80 resistors, 32 transistors, 16 relays, 16 capacitors, 8 ICs and 1 connector.
From the project
Hardware In the LOop
- The Master Conroller unit interface the I/O lines with the PC and perform the configured tests - Digital I/O lines interface - Output lines electrical protection - (optional) Dedicated to the Analog lines PCB

Main components on the HILO
HILO bill of materials (BOM)
156 components, 11 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 8 | MIC4427 | MSOP-8_3x3mm_P0.65mm | U1, U2, U3, U4, U5, U6, U7, U8 |
| 16 | BC817 | SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +8 |
| 16 | BC327 | TO-92_Inline_Wide | Q25, Q34, Q51, Q52, Q53, Q54, Q55, Q56 +8 |
| 1 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J1 |
| 3 | Conn_02x09_Top_Bottom | PinHeader_2x09_P2.54mm_Vertical | DirControl_1, I/O-LinesToDev_1, I/O-LinesToMicro_1 |
| 16 | HK19F-DCxxV-SHC | Relay_DPDT_Finder_30.22 | K1, K2, K3, K4, K5, K6, K7, K8 +8 |
| 16 | 10nf | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8 +8 |
| 16 | 5K | R_1206_3216Metric | R1, R2, R3, R4, R5, R6, R7, R8 +8 |
| 16 | 1K | R_1206_3216Metric | R17, R54, R82, R112, R113, R114, R117, R120 +8 |
| 32 | 10K | R_1206_3216Metric | R40, R56, R65, R84, R105, R106, R107, R108 +24 |
| 16 | 100K | R_1206_3216Metric | R55, R83, R115, R118, R121, R123, R126, R129 +8 |
HILO design files
The KiCad project lives in the catinella/HILO repository on GitHub; these links point at the commit this page was built from.
HILO: common questions
How big is the HILO PCB?
The HILO measures 138.4 × 80.3 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the HILO?
156 components, from 11 distinct parts. The full bill of materials is listed on this page.
Where can I download the HILO design files?
From the catinella/HILO repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the HILO design in my own project?
The repository has no license, so all rights stay with catinella. Use it as a reference, and ask the author before reusing the design.