Is there enough power from the XO USB port?
1. Specs
"2.12.1 USB
The CL1 supports three USB 2.0 ports, two on one side of the display and one on the other. These are all USB type A connectors, for connecting to peripheral and storage devices. Unlike a regular laptop, which provides up to 2.5 Watts per USB port, the CL1 provides a total power consumption of 5 W for all three USB ports. This may be shared equally among all the ports or drawn through a single one, but
cannot be exceeded."
From http://wiki.laptop.org/images/7/71/CL1A_Hdwe_Design_Spec.pdf
2. USB wire hacking, and a useful adaptor for sensors:
a. http://blog.jgc.org/2008/03/building-temperature-probe-for-olpc-xo.html
3. 5 Watt UVC bulbs:
a. http://www.americanaquariumproducts.com/UVCReplacementLamp.html
b. http://www.amazon.com/Purely-Products-PUVH2305-Ultraviolet-Replacement/dp/B001JEPSMQ
c. http://uvclamps.mybisi.com/product/5-watt-uv-bulb-lamp-germicidal-uvc-replacement-g23-base
*. Note: From website c, a safety precaution: "SAFETY NOTE / WARNING: Radiation from UV-C lamps (ultraviolet C - 253.7 nm wavelength) is harmful to eyes and skin. Equipment using these lamps must screen them completely from direct view."
*. Note: Also from website c, "For optimal performance, replace the bulb in your Ultraviolet (UV) device every year even if it continues to light, as over time the bulbs will lose their effective germicidal light spectrum."
*. Note: And more interesting information that air can be purified as well from site c, "effective tool for eliminating microorganisms such as virus, bacteria, algae, mold and yeast in the air and impurities in water."
4. Quick thought on LED UVC. If it is possible, LED bulbs would provide a low-energy mercury free alternative to other UVC bulbs. They would also be more durable and longer-lasting, probably. However, why did they have a different nm wavelength than the one known to be germicidal?
5. 5 Watt USB Power Adapter from US plugs (I need this in reverse, usb to US plugs):
a. http://www.cdw.com/shop/products/default.aspx?edc=1693496
6. Wall plate adapter (Might be useful):
a. http://www.cdw.com/shop/products/default.aspx?edc=1921027
7. USB powered 5 volt Optical Probe:
a. http://www.opticalprobe.net/urunler.aspx?urunID=2
8. USB power cables:
a. http://www.google.com/search?hl=en&q=usb+power+cable+5v&aq=3&aqi=g8g-m2&aql=&oq=USB+power+cable
9. Can a standard USB cable be adapted easily to the two prong connector and will it supply the right voltage? This seems like the simplest solution for getting a basic product going for test purposes.
A quick answer to this entire post:
ReplyDeleteItem number 9. is going to be the method for getting the test device going.
To do this, I will need to learn about the internal wiring of USB cables, to find out which wires carry the power/electricity and which are the ground wires. These will then be attached appropriately to the two prong UVC bulb plug. A layer of electrical tape will then be wrapped around the individual connections, with another layer over both connections. This part of the device should ideally be sealed from contact with water, and to do this I may use a coating of liquid silicon from a tube.