Mindsensors Relay Driver

A couple weeks ago, Deepak from mindsensors sent me a couple of the coming-soon Mindsensor Relay Drivers to beta test (thank you Deepak!).

I’ve been working on trying to better understand how they work, and I think I have them figured out fairly well now. They seem to work really well with motor ports B and C, but port A uses a different H-Bridge IC, and the signals are inverted. To control relays, any of the ports work fine, but to take advantage of PWM (like for motor or solenoid control), I find it best to only use port B or C.

Here is a project I did to demonstrate the relay driver:I used the relay driver to control a relay, which was connected to an outlet; so the NXT can control of the outlet. In the video, I just used a lamp to demonstrate this, but it could be useful for many other applications. I could use it to automate control of battery chargers, outdoor lights, or many other things. Or, like I did in the video, I can use the NXT as a human interface device, and control the outlet through the sensors.

The relay driver is by no means limited to use with relays. You can directly control low-voltage lights, motors, or solenoids as well. The relay drivers are rated for 18v 10A, so they should be able to handle a fair load.

Note, please do not attempt to connect the NXT to any circuit involving mains power. Doing so could cause serious harm to you or your NXT.

This entry was posted in Electronics, Mindsensors, Mindstorms, NXT and tagged , , , , . Bookmark the permalink.

3 Responses to Mindsensors Relay Driver

  1. Melissa :) says:

    Sweet video!

  2. timpattinson says:

    Nice post.
    Does this mean the “dual” relay driver can only drive 1 motor/relay at a time?

    • mattallen37 says:

      No, it can control two, but not totally separately. There are three possible combinations; Off 1 and 2, On 1 Off 2, and On 1 and 2. You cannot do Off 1 On 2 (according to my tests).

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