I need to connect my controller designed in Simulink to a brushless motor controller, which needs a PWM signal. This controller has a PWM connection cable (3 wires)
Is it possible to connect this controller to my PC (using serial port) and let Simulink send control signals to this motor controller?
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Simulink is not supported on any system that is old enough to allow direct pin-level control of a system serial port. Unless, that is, you are talking about generating code for a controller: some of those might be able to handle it.
Ok thanks for all your replies!
I want to control a brushless thruster. Because this is a brushless device, it has a special brushless controller connected to it, to convert my control signal to a brushless motor signal.
The brushless controller has a PWM input cable, which can be connected (according to the manual) to a "Parallax Servo Controller". This device can either be connected via USB or serial to a PC. It needs a TTL signal; that is some binary code right? Can I use matlab to send code to this device?
I found some more info about the brushless motor controller (ESC);
The ESC generally accepts a nominal 50 Hz PWM servo input signal whose pulse width varies from 1 ms to 2 ms. When supplied with a 1 ms width pulse at 50 Hz, the ESC responds by turning off the DC motor attached to its output. A 1.5 ms pulse-width input signal results in a 50% duty cycle output signal that drives the motor at approximately half-speed. When presented with 2.0 ms input signal, the motor runs at full speed due to the 100% duty cycle (on constantly) output.
Can I produce these signals using matlab's serial communication (like fwrite() etc)?
Ok right now I have the following code to send to my PSC:
ser = serial('COM3') set(ser,'BaudRate',2400, 'Terminator', 'CR') fopen(ser) fwrite(ser,[33 83 67 86 69 82 63 13], 'uint8', 'sync') out = fscanf(ser) fclose(ser) delete(ser) clear ser
I keep getting a warning with the fscanf(ser) command:
Warning: A timeout occurred before the Terminator was reached.
Is there something wrong? I used the fwrite command to send the ascii code for the command "VER?", with $SC (33 83 67) being the preamble and CR (13) being the carriage return (so the command line is $SCVER?CR)