a MAX7219 7-segment LCD
Hi, Welcome to the forum.Please read the post at the start of any forum , entitled "How to use this Forum".ORhttp://forum.arduino.cc/index.php/topic,148850.0.html. Then look down to item #7 about how to post your code.It will be formatted in a scrolling window that makes it easier to read.Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?What is the rating of your 12Vdc supply?Thanks.. Tom..
Hi,Have you tried checking without the motor running.If you are feeding 12V to the Nano Vin and using the 5V from the Nano to supply the LED display, you could be overloading the onboard 5V regulator.It cannot dissipate much energy and the load of 8Digit 7 Seg LED display could probably be causing thermal overload and drop out.Tom...
Can you clarify what you mean by 'crashes' ?What exactly does that mean ?Does that mean you get garbage ?It's very hard to isolate LCDs from motor noise if both devices share the same supply. You can verify this easilyby simply removing the power connections for the DS18B20 and the LCD from the motor circuit and poweringthem with a battery that shares a common GND with the motor circuit which will enable you to share data butnot power.
The LCD shows random numbers / scrambles and the DS180B20 stops reporting temperatures.