I am using an Uno and I was using the power supply from USB which is 5V while uploading the code and debugging process. Now i want to use my project without a USB so there is a 24V power supply in my project which I used to step down it to 5V using a TMC2405D DC-DC Converter. But the output from this converter is coming out around 12V and it is affecting the readings to be displayed from the sensors in projects. When I observed this I disconnected this power supply using AC socket back to USB and the readings are perfectly accurate. But when I connected the other power supply it ruins the readings. What can be the problem here?
The TMC2405D can have a input of maximum 26.4V.
Can you measure the 24V in your project ? Is it more than 24V ?
Even without load, the output of the TMC2405D should be 5V with 1.5% accuracy.
Is it broken ? Did you connect it in the wrong way ? Only 5V is acceptable.
If you power an Arduino Uno R3 with 12V to VIN or to the DC barrel jack, then the onboard voltage regulator might get hot. When it gets hot, it will limit the current and the Arduino Uno will no longer work at 5V.
Do you have a multimeter (also called a "DMM") ? If not, then you should buy one or borrow one. Check the all the voltages, also the voltage of the 5V pin of the Arduino board.
It is possible that there is a grounding problem and that the noise from the 24V power supply gets to the Arduino via a GND wire. A detailed schematic or a drawing that shows the wiring will help to understand your circuit.
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R4, or R3 (or earlier) - they are quite different (including their on-board power supplies)
So what went wrong there?
Is if faulty? Did you just buy the wrong version?
What sensors?
Please give links the specifications, and show a schematic of your system - including the power supplies.
Some good, clear photos of the actual setup would also help.
How are you observing readings when the USB is disconnected?
(please include this on your schematic)
Do you have all necessary ground connections in place?
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