![]() If you post the code you're using and a wiring diagram I bet we could help you figure out why it's not working as expected. This uses more current, is noisier and heats up the various parts more than pulse/coast. ![]() ![]() Cant work surely, you cant reserve polarity with single pole. Activate the second relay, while the first is still activated and the power polarity is reversed. Activate either of the relays will open the circuit. Normal position applies power in one polarity. With pulse/brake, you cause the motor to brake with every low pulse. PaulKD7HB: Actually need two SPDT relays. It works well with the Arduino, and once you learn how to. Pulsing the enable pin is known as pulse/coast. The L298N motor controller is a low cost and simple way to control two DC motors at the same time. This technique is relatively common among hobby robotics. The other way to control the motor with two I/O pins is to hold the enable pin high and pulse one of the direction pins. This comes at the cost of being able to use dynamic braking (usually not a problem with small motors). Its diodes also save the controlling device and IC from back EMF. It could control any DC motor speed and direction with a voltage range of 4.5 36 Volts. It may be small in size, but its power output capacity is higher than our expectation. One way is to use an inverter on one of the direction pins. L293D bridge is controlled by external low voltage signals. ![]() There are several ways to control a motor with two I/O pins with a L293D quad half bridge. You need a PWM pin to control the speed but there are several of these.Īnyway, I have avoided the problem by a method of using two pins to control instead of 3 on each motor, and can now use pin 2 for one motor and pin 3 for the other. Any of the I/O pins should be able to control the direction of the motor. Any other pin that can give a digital output of high or low should be able to do the same job, but only these two do it. ![]()
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