Autonomous Pepper Harvesting Robot Design
Thought for 1 min 13 sec
Stopped because the project has no available ACUs, so I can’t continue executing changes right now.
Completed so far:
- Inspected the existing schematic and found the ESP32 DevKitC, XL1509-5.0 buck regulator, 5A fuse, 12V/5V/3V3 rails, motor/sensor blocks, and existing nets already present.
- Checked datasheet guidance for:
- ESP32 DevKitC power/header pins.
- XL1509-5.0 recommended 12V-to-5V/2A application circuit.
- Existing 5A fuse rating.
- Added these Part 1 components:
- J1: 12V battery input screw terminal.
- J2: external normally-closed E-stop connector.
- D4: 10A/40V Schottky reverse-polarity protection diode.
- D5: 1N5820 XL1509 buck catch diode.
- L1: 68uH / 2A buck inductor.
- LED16: green Ready LED.
- LED17: yellow Harvesting LED.
- LED18: red Fault LED.
Not completed yet:
- The generic resistors/capacitors for LED current limiting, E-stop pull-up, buck input/output capacitors, and decoupling were attempted but not added because the generic part lookup failed.
- The newly added components are not wired yet.
- Project files for the power distribution diagram, pin table, BOM, and PCB recommendations still need to be created/updated.
- Schematic checks still need to be rerun and fixed after wiring.
Next work once ACUs are available:
- Add the missing resistors and capacitors correctly.
- Wire battery → fuse → reverse-polarity protection → 12V rail → XL1509 → 5V_SYS.
- Wire common ground, E-stop NC input, and three ESP32-driven status LEDs.
- Update documentation files and rerun checks.
Add missing passives
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Technical Construction File Draft — Pepper Harvesting Robot Controller
Status
Draft for college prototype and future product planning.
Wireless Technology Summary
Table
| Module | Technology | Band | Notes |
|---|---|---|---|
| ESP32 DevKit / ESP32-WROOM | WiFi/Bluetooth | 2.4GHz | Use pre-certified module integration rules and antenna keepout |
| ESP32-CAM | WiFi/Bluetooth | 2.4GHz | Keep antenna at edge and away from motor wiring |
Applicable Topics
- FCC Part 15 / CE RED if operated as a wireless product outside a lab/classroom prototype context.
- EMC risk from stepper drivers, buck converter, long motor leads, and servo current spikes.
- Safety documentation required for moving mechanisms and cutting action.
Required Open Items
- Final schematic export after review.
- Final PCB layout/Gerbers after placement and routing.
- BOM with exact purchasable MPNs for carrier modules, motors, servos, connectors, fuse, and battery.
- Lab EMC/RF test reports if turned into a product.
- User manual with safety warnings and operating procedure.
RF Design Notes
- ESP32 and ESP32-CAM antennas must face outward at board edges.
- No copper pour, ground plane, motor traces, battery wiring, or metal brackets under/near antenna keepout zones.
- Route motor and buck-switching currents away from camera module antenna and UART/I2C wiring.
Status
Wireless Technology Summary
Applicable Topics
Required Open Items
RF Design Notes
