Four independent linear fader inputs per module for volume control, equalization adjustment, and additional expression parameters. The same chainable architecture, applied to precise analog control.
Overview
The analog fader module addresses requirements for precise linear control over expression and tonal parameters. Where expression pedals provide foot-operated control, fader modules offer hand-operated linear sliders for fine adjustments to volume, equalization, and mixing across organ divisions.
Each module provides 4 independent fader/potentiometer inputs via an ADS1115 16-bit ADC, and the chainable I2C architecture maintains consistency across the entire PIPE 2C ecosystem.
Key Features
- 4 fader inputs per module — Independent linear control channels via ADS1115 ADC
- 16-bit resolution — Smooth analog sensing for precise adjustments
- I2C chainable — Standard 4-wire connectors; add modules for more channels
- Address selection — On-board DIP switch for I2C address configuration
- Versatile mounting — Horizontal or vertical orientation depending on console design
- Solderless assembly — Plug-in connections throughout
Schematic
PCB Layout
Bill of Materials
| Component | Designator | Quantity | Description |
|---|---|---|---|
| ADS1115IDGSR | U1 | 1 | 16-bit ADC with I2C (MSOP-10) |
| KH-2.54FH90-1X4P | U2 | 1 | 4-pin right-angle female header |
| PZ254R-11-04P | H3 | 1 | 4-pin male header |
| 4.7kΩ | R5, R6 | 2 | I2C pull-up resistors (0805) |
| SP-01P | U7 | 1 | DIP switch for address selection |
Typical Applications
| Channel | Application |
|---|---|
| 1 | Master volume |
| 2 | Great division level |
| 3 | Swell division level |
| 4 | Pedal division level |
Additional modules can provide:
- Choir / Positiv division levels
- Reverb send / return mix
- Audio output channel balance (front, rear, sub)
- Headphone volume
Connection
Open Source
Full schematics, PCB layout, and BOM available on OSHWLab: