This Instructable will show you how to design a Digital Ohm Meter using
Arduino. This Ohm Meter is very precise...and totally DIY.
Step 1: Gather all the
material.
1) Arduino UNO
2) breadboard
4) Jumper wires
6) A Potentiometer
Step 2: Connect the LCD to
Arduino.
1) Connect the LCD
to the breadboard as shown above (Please solder header pins first).
2)Make
the connections as under:-
* LCD RS pin to
digital pin 12
* LCD Enable pin to
digital pin 11
* LCD D4 pin to
digital pin 5
* LCD D5 pin to
digital pin 4
* LCD D6 pin to
digital pin 3
* LCD D7 pin to
digital pin 2
* LCD R/W pin to
ground
* LCD VSS pin to
ground
* LCD VCC pin to 5V
* A Potentiometer: *
ends to +5V and ground * wiper to LCD VO pin (pin 3)
Step 3: Make the Voltage
dividing circuit (main part)
This part is the
most important part of this instructable. The Ohmmeter works on the principle
of voltage dividing circuit. Which is given By:Vout = R1/R1+R2 * VinFrom here we can calculateR2which is given by:
R2
= R1 * [1/ (Vin/Vout - 1)] Also
we'll be using this
formula in our Arduino Code. (See the code).
OK! So make the
circuit very carefully... as shown above in the picture...
The TWO PROBES in
the above picture are the two wires which we will connect to the object whose
resistance we are measuring.
Step 4: Final Step!!
After all the
connections your circuit would look somewhat like the picture above.....
1) Rotate the Knob
of the pot according to your ease.
2) Use the LONGEST
jumper wires to make the probes. They will provide you with more mobility and
ease of movement.
3) If anyone of you doesn’t
have the display, please inform me, i will post the code for Serial Monitor.
4) Connect the
PROBES and Start Testing!!!!!!!!!.......
5) If you are facing
any problem in this project...Please comment below....I'll be more than happy
to help you.....
Thank you and PLEASE
VOTE if you liked this instructable!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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