Patent ID: 7008795
Filing Date: 2006-03-07
Classification: G01N

Abstract:
1. A chemochromic sensor comprising: a microprocessor including a first pair of I/O pins and a second pair of I/O pins, and means for measuring a voltage drop across the first pair of I/O pins and the second pairs of I/O pins; a first light-emitting diode connected to the first pair of I/O pins; a second light-emitting diode connected to the second pair of I/O pins; a test area configured to receive a mixture of a chemochromic reagent and a test material; and means for driving the first light-emitting diode in forward bias to emit light onto the test area while driving the second light-emitting diode in reverse bias to sense light from the test area by measuring the voltage drop across the second pair of I/O pins to measure a first amount of the test material.