Headbanger Warning Project
As you approach the stairs a sensor detects movement and sends a signal that activates a warning light showing the low head clearance.
 Curent Implementation Details
v0.2 consists of:
- Parallax IR Sensor
- High Intensity Red LED
- 9V Battery Adapter (optional or you can use a wall socket)
- Arduino NG
- Plastic Case
Arduino code for this project, available here.
 Future Improvements
- Replace the LED with a rotating warning light (similar to those found on work vehicles)
- Possible use of XBee
Have an idea that can make this better? Feel free to jump in and add/rewrite or come up with a new implementation
Added 1-18-11 (Suggestion)
One method to make this project without the use of a MCU would be to use the TTL output from the PIR module to trigger a digital relay driven with a regular 2N2222 transistor. The relay in turn can be used to route voltage on and off to the flashing lamp assembly.
The "settle" time for the PIR sensor is required no matter if you are using an MCU or if you have it hooked to some other circuitry. I would suggest using the battery as a backup for a regular wall plug adapter that puts out somewhere in the range of 12 - 15 VDC. With this in mind, you will have plenty of voltage for flashing / rotating warning lights or other style warning devices that use higher voltage / current than an LED.
A 7805 +5 VDC regulator can be used off of the wall adapter to power the PIR module and to be used as pull-up voltage if you decide to have the module use Active Low Logic on the output. Either way, the 7805 can be used, or the higher voltages, for driving a digital relay and providing bias voltage on the transistor.
 Manual Labor related to this project
Scrape and paint the peeling paint on the headbanger. Paint first two coats as Hazard Yellow. Mask out border to black out (including vertical face of stair rise). Paint Stripes
- Block out and paint lettering to signage.
- Add 8-bit Grafitti Graphics