Did my Nano die or what?

Hello , can someone please help me out. I got this Running staircase lights controller , and I dont know who made it . I connected all the wiring , motion sensors and light sensor . Conmectesd +12V from battery , it was working fine , but I kept disconnecting and connecting power supply for testing purposes . In the end , when everything started working , and on last try when I connected it all staircase light went on and was flickering . I thought my battery is bad eventho it showed 12V . I connected it to 220V to 12V transformer and all LED light on stairs lit up at full power , POW on Nano shines bright , but now display dont work and buttons that controlled settings dont work. Feels like the program is lost or something. Is there anything I can do to perhaps revive it? 5 tries of disconnecting power and connecting later now even stair LEDs dont light up.

I didnt mess up wiring and didnt short anything. One of my motion sensors didnt work , thats why I kept disconnecting/connecting 12V power for testing.

Please help :slight_smile:

I moved your topic to an appropriate forum category @montypetr.

In the future, please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.

This is an important part of responsible forum usage, as explained in the "How to get the best out of this forum" guide. The guide contains a lot of other useful information. Please read it.

Thanks in advance for your cooperation.

1 Like

Transformer converts 220VAC to 12VAC. That's your case?
Power supply converts 220VAC to 12VDC.
Battery charger converts 220VAC to about 14VDC.

1 Like

When you connect the 12V power supply is the +5V present on the arduino?
If not check the voltage regulator ( which seems in the upper right corner ) is connected properly ( a broken wire )?
Also there are no capacitors on the regulator?
Is there anything hot, overheating?

1 Like

Thank you for reply. I have 220VAC to 12VDC

Good!
If you can, disconnect arduino from rest of the setup and try to compile.

1 Like

If it's a super cheap clone from Amazon, AliExpress or EBay, you probably popped the voltage regulator or the anti reverse polarity diode(which is microscopic on those cheappies).

1 Like


Thank you very much for reply!

Is this black thingy the regulator? Left pin has 12V , right pin has 8.9V. When i wiggle 12+ and 12- wires arduino light very slightly flickers and stairs lights up , but they light up on constant full power.
Arduino has 5V.
At the very beginning it used to do running thingy.
Everything is soldered behind. Maybe I should solder 12+ and 12- instead of these connectors?

Nice wiring... :flushed:
Anyway 12 to 9V regulator makes sense to power arduino.
Maybe some spike when you connected your external supply on the go?

1 Like

Yes L7809 is 9V regulator and it works as you measure 8.9V and +5V on arduino.
Does reprogramming arduino works, does the serial debug outputs something?
If it does not seem like... 'he didn't appreciate' some of the treatment : - (

1 Like

Thank you!
I found there was 12- loose solder contact , might have done some unnoticed. Its on me for overtightening the wire. You might be right for that didnt appreciate the treatment:)
Should clicking that arduino button do anything? Led light named L lights up , but nothing happens and stairs keep on full power. It does not have any short circuit , so it seems they are lit controlled by arduino itself, eventho the program isnt supposed to do so. Before it did running lights checkup or it seemed, when supply was connected.

What is serial debugging outputs , is it something i can do by connecting to pc?

I havent done arduino programming ever , tomorrow will look for cable and an application to use.

Difficult to follow.
How you know what it supposed to do if you haven't programmed it?

Because it was working at first. This is someones made controller for staircase running lights , it worked for a while while I was testing why 1 of 2 motion sensors didnt work. After couple of battery disconnections it started malfunctioning :slight_smile:

Wow, interesting... So you try to find out if arduino failed or some other component in this setup...?

1 Like

...And if you compile new code to arduino to verify it's working correctly, you loose the actual code and you have no experience to rewrite new code? Then you have to be careful here.

1 Like

Yes sir , I want to setup my staircase with running lights . Everything is mounted , I had tested it couple times , light sensor and upstairs motion sensor worked flawlessly , but dowmstairs sensor didnt. I tried swapping their signal places to see if its the sensor, switched back up the power and it started malfunctioning sadly.

If you swapped things on the go, powered on , there are high changes something got damaged.

I found who the dealer was and sent the chipset back for inspection. I can post when I get it back to know what happened, but I suspect it might be cheap adruino clonebat fault.