Project 3: Development of Wireless Gas Detectors REU Student: Jose Vigil Graduate mentors: Chris Hughes, Xiaochen Wang Faculty Mentor(s): Dr. Hyoung Jin Cho Week 4 (June 13 –June 17, 2016) Accomplishments: -Finished Installing software. -Wrote code for both meters. -Got the Voltage meter working. -Also made a Amp meter with the Volt meter. Issues/problems encountered and solutions (if any): -The sensor does not read accurately a small current. -Need to be able to measure Micro Amps . (Only 6 decimal places and micro amps start at digit 6) -A Current amplifier (OP AMP) for possible solution. Another Solution?: By increasing the Resistor value, the current becomes smaller. Easier to read by sensor.

TESTING 1.5V AA Battery Voltage Meter reading: "1.580000 , 1.570000, 1.580000“ 9V Battery (Actually 3V) Voltage Meter Reading: “3.220000, 3.210000, 3.230000, …” 1.5V Battery--- 10Ω Resistor By Ohm’s Law expected Current 0.15 Amps Actual Reading: “0.143000, 0.142000, 0.143000, …….” 1.5V---1MΩ Resistor Expected Current 0.00000158 Amps (~1.58 micro Amps) Actual Reading (“0.000002, 0.000002, …)(~2 micro Amps) 3V(3.11 Volts at the time of test) Battery--- 10Ω Resistor Expected Current 0.311 Amps Actual Reading: “0.350000, 0.305000, 0.290000, 0. …….” 3V Battery – 1MΩ Resistor Expected Current 0.0000029 Amps Actual Reading “0.000003, 0.000003, 0.000003 , ….”(~3 microamps)

Next Week: -Try to solve the amplification problem of Micro Amps. -Figure out which resistor to use in the circuit for better accuracy.