https://github.com/tve/netflasher

Flash an LED when a bird hit the net in bird-deterrent window covering experiments.
https://github.com/tve/netflasher

Last synced: 10 months ago
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Flash an LED when a bird hit the net in bird-deterrent window covering experiments.

• Host: GitHub
• URL: https://github.com/tve/netflasher
• Owner: tve
• License: mit
• Created: 2022-05-31T00:48:13.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2022-05-31T00:56:14.000Z (about 4 years ago)
• Last Synced: 2025-04-08T09:52:52.571Z (over 1 year ago)
• Language: C++
• Size: 32.2 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

          
NetFlasher2 - Emit a flash when a bird hits a net

================================================

The NetFlasher2 is a simple circuit to flash an LED when a bird hits a net and is used

in experiments to determine which window coverings are best to deter birds from flying

into them.

The netflasher detects when a bird hits a net using a vibration sensing switch.

It then briefly turns on a bright LED which is placed in the viewfield of a camera

recording the experiment.

This provides an unmistakable "hit" signal.

Instructions

------------

- Use micro-USB cable to power the netflasher (uses <80mA)

- The flashlight lights for 200ms when the vibration sensor is triggered

- After triggering, the flash is locked-out for 10s

- Tiny orange LED: slow (2s) = ready; fast (200ms) = 10s lock-out

- Red LED: vib sw detected (always active, even during lock-out)

- Green LED: display sensitivity (blink 1x/2x/3x/4x), 1=most, 4=least

- Blue sw:

  - first press: display sensitivity & reset lock-out

  - press again within 2s: change sensitivity (1/2/3/4)

- White sw next to microcontroller: program mode (cut power to exit)

Circuit Notes

-------------

### Net motion detector

- Vibration detection switch "SW-18010" https://www.adafruit.com/product/1766

- Sensitivity is adjusted by requiring toggles in multiple 10ms windows: sensitivity 1

  requires just one toggle, 2 requires toggles in 2x 10ms within 100ms of one-another,

  3 requires toggles in 2^2 = 4x 10ms intervals, 4 requires 8x 10ms intervals 

### Sensitivity switch

- Pushbutton to change sensitivity

- On-board sensitivity indicator LED (1, 2, 3, or 4 flashes)

### High power Cree LED

- Amber 5mm LED: C503B-ABS, 4430mcd @20mA, 40mA max continuous

- drive using 2N4401 w/82Ω -> ~40mA

### High power "flash" LED

(Not used due to size concerns)

- Wire-up raw flashlight LED

  - 135mA@2.8V=1/3W

  - 220mA@2.85V=0.6W

- 2N4401: 600mA max

  - resistor emitter-ground: 10Ω->1W flash

- On-board indicator LED

- To disassemble flashlight:

  - pull zoom ring hard and unscrew, remove driver

  - remove btn cap, punch btn through alum housing

Arduino

-------

To use `arduino-cli` install according to first post:

- https://forum.pjrc.com/threads/53548-Arduino-CLI-Alpha-Release-Teensy-Support

Instead of `arduino-cli core install teensy:avr` run:

- `arduino-cli core update-index`

- `arduino-cli core install teensy:arm`