Model History

2024 URI Laser Scarecrow

Provided assembled and tested (not a kit)
New mounting for servo and laser module allows greater and more reliable range of tilt
Breakout board for rotating arm simplifies connection to slip ring cabling.
60 units in process of being built (April-May '24)

Stop switch on control box instead of its own box
Single standard outdoor RJ45 cable from controls to scarecrow includes power
- Controls have two sliders and two push-buttons, louder buzzer
Multi-color LEDs inside scarecrow provide visual feedback to go along with buzzer
Improved algorithm for small usable areas (2022 can upgrade to this; contact us)
Laser cap printed in translucent plastic for easier and safer setup (any model can upgrade to this; contact us)
Accelerometer (tilt switch) is replaceable.
Changed to TMC2209 stepper driver; quieter and more available than A4988
Built 60 kits

Housing based on white 3.5 gallon pail
Controls in separate, weatherproof box instead of in bucket on main board
- One push-button, three sliders
- Power cable separate from custom control cable
Buzzer for audio feedback during operation and pre-laser warning
Accelerometer chip on main board replaces pinball tilt switch
ESP32 microcontroller
Initially built 40 kits; added another 20

Housing based on black 5-gallon pail
"Direct drive" setup with no belt
Smaller, rectangular plywood base for components
Key switch, emergency stop connection, laser cap, labeling, etc to meet FDA requirements for Class IIIB device
Parts printed in ASA (like ABS for temperature, but better UV resistance)
Built 20 kits

Housing based on black 5-gallon pail
- Housing based on black 5-gallon pail
- Aluminum tape on black bucket provided higher contrast for sensor...
- ...but increased internal temperature
Large octagonal plywood base for components.
Circuit board with "through-hole" components assembled at URI
Separate buck converters to power 5V circuitry and laser from 12V supply.
Belt-drive setup required motor sled tensioning system, hollow geared plastic shaft for wires to reach bottom.
Tilt switch uses a pinball resting on a microswitch
Initial parts were printed in PLA and softened in strong sunlight; replaced with ABS; added radiant barrier