hello,
ı have a project which is attached.
ı use arduino uno (used 6 digital pins for lcd, 2 analog inputs, 5 volt pin), acs712 current sensor, LM713 adjustable voltage regulator, 7805 voltage regulator, 16x2 lcd
ı used 12 volts 2 A adaptor but when ı connect, arduino shut down? ı think 2 a is enough.
how much current do ı need for this circuit?
thanks in advance.

 

What happens if you power it by USB port only? Does it work? Why have a 12V source?
What happens when you power the UNO via the +5V pin from the 7805 instead of Vin?
Based on a wuick look at the circuit, you should not be using much current.
What is the 12V source? Many wall-wart types have very high unloaded voltages, in the range of 17-18V which can possibly damage the UNO regulator.

 

Your schematic doesn’t show where you are powering the Arduino. I see a +5V connection. Where is the 12V connected?

Can you post the Arduino PIN numbers/ labels? Cross-referencing to the ATMega pins is tedious.

 

What happens if you power it by USB port only? Does it work? Why have a 12V source?
What happens when you power the UNO via the +5V pin from the 7805 instead of Vin?
Based on a wuick look at the circuit, you should not be using much current.
What is the 12V source? Many wall-wart types have very high unloaded voltages, in the range of 17-18V which can possibly damage the UNO regulator.

I have a project so ı have to supply whole my circuit with same supply. So ı have decided to use 7805 to supply 5v required components.

 

Your schematic doesn’t show where you are powering the Arduino. I see a +5V connection. Where is the 12V connected?

Can you post the Arduino PIN numbers/ labels? Cross-referencing to the ATMega pins is tedious.

At the output of the 7805, there is a blue power bus, you can see. I am suppying lcd, sensor and arduino with that 5 V. Also, ı am supplying 7805 and LM713 with 12 v. These 12 volts are shown different but in real circuitry, these are same 12 V.
This proteus cct works very well. But in real world, my circuitry does not work

 

Have you measured the output from the 7805 with no load, and with the load connected?

 

Have you measured the output from the 7805 with no load, and with the load connected?

with no load, it gives 5 volts. with load, ı did not try it. ı will try
thanks

 

with no load, it gives 5 volts. with load, ı did not try it. ı will try
thanks

Always measure because you can't see it and you may be looking in the wrong place.

 

Always measure because you can't see it and you may be looking in the wrong place.

actually, ı take 5 volts correct pin. the output pin of the 7805.

 

Does the MCU shutdown or reset? If there is nothing else powered except the MCU does it behave the same way? Is there a spike or a sag at power on? Do you have bypass capacitors close to the VCC of the MCU?

Please describe the sequence of events from power on to MCU "fail".

 

Does the MCU shutdown or reset? If there is nothing else powered except the MCU does it behave the same way? Is there a spike or a sag at power on? Do you have bypass capacitors close to the VCC of the MCU?

Please describe the sequence of events from power on to MCU "fail".

shut down
answer for other quesrtions is "no".