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Circuit and Pic program for multi parameter tester

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Thanima19

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Need to test
a. transistor - good or bad and pnp or npn
b. diode - good or bad
c. continuity

pic 16f877a ,lcd display is required
2 switches to select these 3 parameters
ie, si and s2

a menu driven c program is required

switch s1 is used to view the three parameter
and switch s2 selects the parameter

for eg:
if we want 2 test a diode,
then press switch s1 twice then press s2 to select diode
and check whether diode is good or bad



plz reply soon
its urgent
 

jgruszynski

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Cheap and easy solution: buy a cheap DMM that has these functions built-in. Typical cost: US$ 20-50 at most.

If you need it commercially, I can sell you something for production test that does this. Not for free, naturally.
 

Thanima19

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its my project
need to do it
plz help me
 

jgruszynski

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I'm not going design it for you but if you need help, answer the following yourself - they are the essential first questions to figure out.

1. What are the tests requires to accomplish these functions? How do you "know" when these devices are good or bad?

Hint: Multimeter test for diodes and transistors :: Electronics and Radio Today

2. What are the circuits necessary to perform these tests?

3. What features are required in a microcontroller to implement these circuits and accomplish these measurements?
 

Thanima19

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http://www.microcodes.info/pic16f877a-based-npnpnp-transistor-tester-in-ccs-c-2241.html

http://www.microcodes.info/pic16f877a-based-diode-tester-in-ccs-c-2249.html
Plz check out des liks
i juz want to combine dis
 

jgruszynski

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Looks like you have all you need. Theory of how to test. Circuit diagrams. Source code.

The transistor test is, as expected, just 2x the diode test on each bipolar transistor junction. The diode test is just continuity testing in each direction. Continuity testing is applying a voltage and measuring the current by measuring the drop on a resistor (Ohm's Law).

Pretty straight forward as it's already doing each of these with pretty much the same circuit (transistor case). The rest is cosmetic software changes. I don't know PIC specifically but the C code for each seems pretty much like what you'd expect for a microcontroller.
 

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