ESPRekup V2 — compact ESP32-C3 based controller boards designed specifically for the Vent-Axia Sentinel Kinetic B.
Provides optocoupler switch emulation, RS232 diagnostics, wall-switch inputs and optional I²C sensors.
- 3 optocouplers (SW1/SW2/SW3), 3 front buttons, wall impulse inputs, RS232 header, I²C.
- Visible user interface.
- Schematic
- Same I/O as Full but no front buttons — intended for internal mounting inside the MVHR case.
- Minimal: RS232 + wall impulse inputs + I²C. Small footprint.
- Target device: Vent-Axia Sentinel Kinetic B
- Optocouplers emulate the physical low/med/high switch closures expected by the Sentinel. This is the most compatible control method.
- RS232 is available for diagnostics and higher-level control if supported by your unit.
- The board can be powered either from USB or from the MVHR via the RJ9 connector.
- To select MVHR power, bridge the power jumper on the back of the PCB (check the silkscreen for the jumper label).
Caution
Do NOT power from USB and RJ9 at the same time. Removing one source before applying the other is mandatory to avoid damage.
- ESP32 is able to communicate with MVHR unit using forked version of alextrical's ESPHome component and read information shown on the unit's display
- All available information in diagnostics menu can be found here
- Example ESPHome configs
- GPIO0 -> Opto-coupuler Low mode
- GPIO1 -> Opto-coupuler Medium / Normal mode
- GPIO2 -> NC
- GPIO3 -> Opto-coupuler High / Boost mode
- GPIO4 -> NC
- GPIO5 -> Button Low mode
- GPIO6 -> Button Medium / Normal mode
- GPIO7 -> Button High / Boost mode
- GPIO8 -> I2C SDA
- GPIO9 -> I2C SCL
- GPIO10 -> Grounded Input for Impulse wall switches
- GPIO20 -> RX
- GPIO21 -> TX
- @Alextrical PCB Design inspiration ESP32-Sentinel-Kinetic-Wireless-Dongle
- @Alextrical ESPHome Component ESPHome-Vent-Axia-Sentinel-Kinetic
- @aelias-eu Vent-Axia wired remote protocol reverse engineering vent-axia-remote