As a result, there might be big spikes on the powerline when you are reversing the direction, which could lead to problems with other devices connected. The MX1508 has no fly back/free-wheeling diodes present, though they are advised by the chip manufacturer. It is very well possible that it is an unintentional mistake in the PCB. Connecting it (to pin 8) seems the right way to go though. When analyzing the PCB, one odd thing becomes clear: Pin 4 (VDD1), the input for the operating voltage of Motor A, seems to be not connected to anything. With most hobby motors being either 6 or 12 Volt, 10 Volt may not be the most practical voltage. The digital part of the MX1508 however is fed through a 220 ohm resistor with the resulting voltage being capped by what I presume to be a zenerdiode of 5 Volt. The module however, has only 1 Voltage input, that supposedly can take 2-10 Volt. has a working voltage of 1.8-5Volt, but can drive motors with an operating voltage of 2-9.6 Volt. The MX1508 from Shenzhen Guanghui Electronics Co., Ltd. The pin spacing is 0.1″ but the various connectors are at aberrant spacing.
The module itself is not really breadboard friendly. It is rated at 1.5A on each motor with a peak of 2.5A. It is an H-bridge configuration for each motor and so can drive the motors in either direction. This board can drive two motors independently. Note: The L298's hard break function is not supported.Three popular, cheap motordriver boards that are available on chinese webstores are the MX1508, L9110S and TB6612.Īt Aliexpress and Banggood, the MX1508 is listed as a “Dual Channel L298N DC Motor Driver Board PWM Speed Dual H Bridge Stepper Module”. However yo'll need to supply external 5V to the L298's logic circuit otherwise your motor will not move. If your supply is greater than 12V, remove the jumper to prevent damage to the voltage regulator. There is also an onboard 5V regulator - so if you're using between 7 and 12V DC to driver the motors, you can connect the jumper to allow this voltage regulator to supply 5V to your L298's logic circuit. The RPM is controlled using PWM input to ENA or ENB pins, while of rotation direction is controlled by suppling high and low signal to EN1-EN2 for the first motor or EN3-EN4 for second motor. The driver can control both motor RPM and direction of rotation. The driver has a nice heatsink to keep the L298N cool and all driver lines are diode protected from back EMF. This dual motor driver is based on the L298N heavy-duty dual H-bridge controller, which can be used to drive two DC motors at up to 2A each, with a voltage between 5 and 35V DC - or one stepper motor or 2 solenoids with ease.
0 kommentar(er)
