I have connect the driver to the motor without the controller and producing rising edge by switching on the power manually. I am unable to get the motor to turn as I suspect the driver needs to be welded, which will ask George to supervise me tomorrow to weld them and try it out.
I have also connected the load cell with the op-amp under a inverting configuration. I chose the gain to be 100, which will bring the voltage output of the load cell from 1~10mV to 0.1~1 V. The output I got out this afternoon only varies from 8 to a lit less than 10V which makes me think it is not correct (with a supply voltage of 10V).
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