I have bought an h-bridge (TI SN754410) in order to control my DC-motor back+forward and it works perfectly by the way, but I still have a few concerns. I basically built my circuit after the instructions on the picture you can see below (without the switch, I only use the h-bridge).
Questions => (1) As external power-supply for my engine I use a 8.4 volts or 11.1 volts battery and the whole battery is basically attached to the Arduino, is it? However if I run the engine at full speed, does the Arduino withstand all the current-flow without getting damaged because there are no resistors (see picture). (2) What´s the maxium external voltage I could apply not to damage the Arduino (the h-bridge can stand up to 36V, 1A) => for instance if I apply this voltage, does the Arduino not get damaged?
Can I run my motor safely at constant full speed with 8.4 volts and the configuration on the picture?