The ACS712 Low Current Sensor Breakout has just arrived.

As I have mentioned before in a previous post, in order to make working the speed controllers it is necessary to initialize them first. This requires that previously the main board (Seeeduino Mega board) has been switched on, as it is the main board that makes the initialization. This procedure gives no problems when the sequence between the connections of the main board and the speed controllers is respected. However, if for any reason the main board have been previously switched on and after that it is switched off and then switched on again, the initialization happens twice even the speed controllers have already been initialized. This is because the status of the controllers it is not known and thus the motors can run up to the maximum speed. Therefore one needs a current sensor to detect whether the speed controllers are either switched on or off. I have  selected the sensor "ACS712 Low Current Sensor Breakout" which can be seen in the picture above. More information about this sensor can be found on page of its manufacturer. One of its advantage is that one can use it for example, to monitorize the power consumption of motors.