Today i made this Test instrument using Arduino ..very very usefull in find out shorted electronic components in mainboards.. espcially when lot of ICs sharing same power.
if one componet get short the whole track shows 0 resistance when testing with normal multimeter.. its difficult to find which one is the dead rat.
Normally we need to take out each suspected component from board and need to test until we got the defective one.. its tedious job and damage the board.
Another way inject current to the circuit test the heat.. its not safe.
Here is the need of this device. When we trace the power line with this probe.. it gives high pitch audio tone when the probe near the particular shorted component..
It can test micro ohm resistance beyond normal meter range
Automatically shut to save battery .if we forget to switch of the tester
Auto calibration range.
Portable
The tester voltage and current safe to testing any components .
On board testable..
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