Last week I made new arduino project where I want to control a stepper motor with a IR-remote. However, I don't want to connect my arduino nano with usb, instead I want to use a 9v battery. See the included picture for the used wiring.
This system is doing what I want, but after turning the stepper motor a few times the stepper is starting to react very weird on the given input by the IR-remote (e.g. instead of making the desired half turn it only do a smal part, and also only want to rotate clockwise and not counterclockwise any more). I already checked the quality of the used 9v battery but this is a new one.
Does anybody have some advise together with a schematic how to connect the wires on my arduino nano for getting the desired system.
Your typical 9 Volt battery cannot provide the current required by your circuit but for a few seconds. If you want reliable long term run time you need to change to a larger battery pack. If the motor is not mobile or not in a remote area, use a wall wart power supply capable of delivering around 9 Volts and half an Amp or more.
Are there ways (by adding for example some extra components) that it is still possible to use the 9v battery? Because for a school project we are building a prototype which need to be transportable and not dependent from wall power supply?
A 9 Volt battery is simply too weak for motorized applications. Personally I would suggest a 2S Lipo battery of around 2200 mAh. Full charge output is 8.4 Volts and won't sag to it's knees when you start the motor but still light enough. However, Lipo chargers (good ones) are a little pricey if you are not going to do much in this field. A 5 or 6 AA battery pack will also work.
However if you could discover how to get more power from something that it actually contains then you will have made your fortune.
.. and you would have saved all energy problems of the mankind for the benefit of Mother Earth ->
My vote for the next 10 Noble prizes will go to you - for sure.
