C1 Microcontoller R(7-12) or R14/15 Robots stops Observation Low This assumes the micro – stops working short circuits running Microcontroller will stop working from stops working, too much current to the probing the micro from the I/O resistors C2 User input fails R13/14/15 open User buttons are Observations Low – circuits floating button presses are erratic C3 LEDs turn R(7-12) open circuits No information to Observation Low don’t – on user LEDs don’t work D1 No power to Cout_reg, Cpow5d, Short to battery, Kills the battery High circuit Cin_reg, Cinbulk, no power to quickly by Cdpowin short circuit drawing to circuited, linear much current regulator dead D2 5V Power rail > Linear regulator Damage to Observation High – 5V failed components on regulator too PCB hot, smoke D3 5V Power rail < Linear regulator Robot Observation High doesn’t – 5V failed work smell or probing circuit
C1 Microcontoller stops working R(7-12) or R14/15 short circuits Robots stops running Observation – Microcontroller stops working, probing the resistors Low This assumes the micro will stop working from too much current to the micro from the I/O C2 User input fails R13/14/15 open circuits User buttons are floating Observations – button presses are erratic Low C3 LEDs don’t turn on R(7-12) open circuits No information to user Observation – LEDs don’t work Low D1 No power to circuit Cout_reg, Cpow5d, Cin_reg, Cinbulk, Cdpowin short circuited, linear regulator dead Short to battery, no power to circuit Kills the battery quickly by drawing to much current High D2 5V Power rail > 5V Linear regulator failed Damage to components on PCB Observation – regulator too hot, smoke High D3 5V Power rail < 5V Linear regulator failed Robot doesn’t work Observation – smell or probing circuit High
hw11_grp7.docx