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Dependencies: HBridgeDCMotor RateLimiter mbed
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This is a cheap L298N breakout board, easily available on ebay or other stores for 2-3 USD.
The schematics of the board is shown on the figure below. There are 3 jumpers placed on the board (CON5, ENA and ENB).
For low voltage DC motors remove a jumper CON5 and connect the supply from battery (5-6 V) to both terminals: +5V and +12V. For supplies larger than 7 V, connect it only to +12V, with the CON5 jumper placed on the board. Study the L298 datasheet for more details.
The following video shows the result of running the program:
Another example is shown in the next video. We now have the supply voltage of 12 V and the jumper CON5 placed. The code is modified a little:
#include "mbed.h"
#include "HBridgeDCMotor.h"
HBridgeDCMotor motor(p23, p24);
int main() {
float sampleTime = 10e-3, switchingFrequency = 25e3, rampTime = 5;
motor.configure(sampleTime, switchingFrequency, rampTime, rampTime);
while(true) {
motor.setDutyCycle(1);
wait(15);
motor.setDutyCycle(-1);
wait(15);
}
}