sensors

Quantum dot image sensors set to change camera industry

Quantum dot image sensors set to change camera industry

Those of you who, like me, just recently managed to score the digital camera of your dreams will be very excited to learn that it’s possibly going to be obsolete real soon. Based on technology developed by University of Toronto professor Ted Sargent, who is now CTO at start-up InVisage, the new image sensor uses a matrix of nanoparticles embedded in a polymer film which can be simply “painted” onto the top of a low-cost wafer at room temperature. If the hype is to be believed, the new sensor offers four times the sensitivity of conventional CMOS image sensors at a dramatically reduced cost per chip. [Thanks, Glen!]

Brilliant low-tech soil moisture sensor

Brilliant low-tech soil moisture sensor

Two galvanized nails set in a plug of plaster-of-Paris. That’s it. The Cheap Vegetable Gardener, who created the sensor for an automated grow box project, explains:

Technically a gypsum block measures soil water tension. When the gypsum block is dry it is not possible for electricity to pass between the probes, essentially making the probe an insulator with infinite resistance. As water is added to the problem more electrons can pass between the probes effectively reducing the amount of resistance between the problem to the point when it is fully saturated where the probe has virtually zero resistance. By using this range of values you can determine the amount of water than exists in your soil.

[via Hack a Day]

Tilt sensor tutorial on adafruit

Tilt sensor tutorial on adafruit

Limor has posted another installment of her exceedingly excellent sensor tutorials, this one on that most marvelous of switches, the tilt sensor. When you just have to know which end is up, you need to strap on one of these puppies. Here’s how. Sensor tutorials – Tilt sensors! More: Force Sensitive Resistor (FSR) tutorial Ladyada’s […]