Controller Requirements
User request
Build an ESP32 controller with 8 inputs and 8 outputs. Use optocouplers for both inputs and outputs. Specified input voltage: 12–36 V.
Current project state
The project is blank: no components or nets have been added. No parts have been researched, selected, or verified; no schematic or PCB work has been performed.
Clarifications needed before circuit design
- Does 12–36 V describe the controller power supply, the digital input signal voltage, or both?
- What loads will the outputs switch, at what voltage and maximum current per channel? Are isolated transistor/open-collector outputs acceptable, or are relay contacts required?
- Must the field input/output grounds be galvanically isolated from the ESP32 power domain? Optocouplers alone do not establish system isolation if supplies share grounds.
Next work
Resolve the electrical interface requirements, then choose the ESP32 variant and power architecture, size input protection and optocoupler drive for the confirmed voltage range, select load-appropriate optocoupler-controlled output drivers and protection, capture and verify the schematic, and proceed to PCB layout after schematic approval.
Session limitation
Execution stopped because the account ran out of ACUs. No design execution occurred in this session.