OHIS BT
About the OHIS BT PCB
OHIS BT is an open source PCB design by Reid-n0rc, published on GitHub under the CC-BY-NC-4.0 license. It is a board, with 22 components from 13 distinct parts.
Other key parts include the PRTR5V0U2X, NAU8822L and 12.288MHz_OSC. By type, the board carries 8 capacitors, 6 resistors, 4 ICs, 2 transistors and 2 connectors.
It belongs with the iot & wireless, audio and power & battery designs in this gallery.
From the project
Bluetooth to OHIS hardware interface
1. Open KiCad 7.x 2. File → Open Project → select ohis-ble-bridge.kicadpro` 3. Open Schematic Editor (eeschema) 4. All three sheets accessible via the Sheets panel
These nets cross between sheets via global labels:
The ESP32-H4 provides native Bluetooth 5.4 LE support with a full LE Audio stack, making it the ideal SoC for modern hearing aid connectivity.
- CIS (Connected Isochronous Streams) — unicast point-to-point streaming from the bridge to one or both hearing aids. Used for direct, private audio streaming with the Hearing Aid Profile (HAP). - BIS (Broadcast Isochronous Streams) —…
Main components on the OHIS BT
OHIS BT bill of materials (BOM)
22 components, 13 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | PRTR5V0U2X | SOT-363_SC-70-6 | U3, U4 |
| 1 | NAU8822L | QFN-28-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U5 |
| 1 | 12.288MHz_OSC | Oscillator_SMD_EuroQuartz_4pin_3.2x2.5mm | U6 |
| 1 | SI2301 | SOT-23 | Q1 |
| 1 | 2N7002 | SOT-23 | Q2 |
| 1 | OHIS_RJ-45 | RJ45_Amphenol_54602-x08_Horizontal | J2 |
| 1 | Sharp_LS013B7DH03 | Molex_503480-0600_1x06-1MP_P0.5mm_Horizontal | J3 |
| 2 | 10nF | C_0402_1005Metric | C7, C8 |
| 5 | 100nF | C_0402_1005Metric | C9, C10, C11, C12, C14 |
| 1 | 4.7µF | C_0603_1608Metric | C13 |
| 4 | 10k | R_0402_1005Metric | R9, R10, R11, R13 |
| 1 | 560R | R_0402_1005Metric | R12 |
| 1 | 100k | R_0402_1005Metric | R14 |
OHIS BT design files
The KiCad project lives in the Reid-n0rc/OHIS_BT repository on GitHub; these links point at the commit this page was built from.
OHIS BT: common questions
How many components are on the OHIS BT?
22 components, from 13 distinct parts. The full bill of materials is listed on this page.
Where can I download the OHIS BT design files?
From the Reid-n0rc/OHIS_BT repository on GitHub, which has the schematic; the links under Design files point to each one.
Can I use the OHIS BT design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
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