Demo Platform for the Low Voltage Motor Driver

This is the robot I quickly built to demo the Low Voltage Motor Driver. If is based off the Mr. Basic platform and MSP-430 Launchpad. It has a 6.4V lithium battery as the main power source which feeds into the voltage regulators on the Launchpad.

For direction control a top mounted servo spins a Sharp gp2y0d810z0f IR sensor. The sensor has a single data line which is pulled low when a object comes within 10cm of the sensor.

Most of the code for the hardware is already written. Just need to finish the controls and it will be ready for a video.

5 thoughts on “Demo Platform for the Low Voltage Motor Driver

  1. Hey, thanks for designing this board! I got a few made last fall and am using them (successfully) in a couple of little projects. I’m curious about your statement “feeds into the voltage regulators on the Launchpad”…. could you elaborate on how you have that connected? I am using an external 3.3V regulator right now because I thought I had to.

    • Thats great Mike! Care to share what you built with it? If you need more boards I can send you some.

      To power the Launchpad off of anything more then 3.3V you have to go through the on board regulators that are used for when it is USB powered. There are 2 Test Points (TP) near the USB port. One is the +5V and the other is ground. I pipe the power into the +5V TP. Care is needed however as having the battery turned on and plugging in the USB would be a bad idea. I have a switch that disconnects the battery from the system so I can plug in the USB.

      For the next version of the driver board I would think a 3.3V regulator would be useful so the driver board can just power the Launchpad by its self.

      • Ok, cool. Wasn’t sure if feeding something > 5V would be a problem. So just + to TP1 and – to TP3?

        So I made a little bluetooth tank with one, and am working on some lego robots with my son with another. It’s funny you mention adding a regulator to the board, since that’s exactly what I did. Since I didn’t need any logic level voltages off the board, I just used a through hole UA78M33CKCSE3 and stuck it in the LOGIC_V spot, wrapping one leg around the board and connecting to the VIN+.

        Oh yeah, and I used your UART code to talk to my bluetooth module. Works great, so thanks again!

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