Horn Circuit
About the Horn Circuit PCB
Horn Circuit is an open source ESP32 PCB design by Monash-Railway-Express, published on GitHub. It is a 2-layer board measuring 100 × 91.7 mm, with 16 components from 15 distinct parts.
Its main chip is the SN65HVD230, from the ESP32 family. Other key parts include the ESP32-S3-DEVKITC and SN65HVD230DR. By type, the board carries 5 resistors, 3 ICs, 3 connectors, 2 diodes, 2 capacitors and 1 jumper.
Main components on the Horn Circuit
Horn Circuit bill of materials (BOM)
16 components, 15 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SN65HVD230 ESP32-S3-DevKitC | ESP32-S3-DevKitC | U1 |
| 1 | ESP32-S3-DEVKITC DFR0299 | MODULE_DFR0299 | U2 |
| 1 | SN65HVD230DR | D8 | U3 |
| 2 | 2301844-1 | DSUB9_FEMALE_RIGHT-ANGLE-THT_2301844-1_TEC | J2, J4 |
| 1 | CONN_02X20_ODD_EVEN Screw_Terminal_01x02 DAC OUT | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J3 |
| 1 | Jumper_Term_Res | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | PREOP LED Y | LED_D5.0mm | D1 |
| 1 | OP LED G | LED_D5.0mm | D2 |
| 1 | 0.1UF 0.1uF | C_0603_1608Metric | C1 |
| 1 | 10UF 10uF | C_0805_2012Metric | C2 |
| 1 | 120 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 330 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 10K 120 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 10k | R_0603_1608Metric | R4 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
Horn Circuit design files
The KiCad project lives in the Monash-Railway-Express/KiCad_Files repository on GitHub; these links point at the commit this page was built from.
Horn Circuit: common questions
What microcontroller does the Horn Circuit use?
The Horn Circuit is built around the SN65HVD230, from the ESP32 family.
How big is the Horn Circuit PCB?
The Horn Circuit measures 100 × 91.7 mm, has 2 copper layers and is 1.600198 mm thick.
How many components are on the Horn Circuit?
16 components, from 15 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 Horn Circuit design files?
From the Monash-Railway-Express/KiCad_Files 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 Horn Circuit design in my own project?
The repository has no license, so all rights stay with Monash-Railway-Express. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Horn Circuit without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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