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board of education

juanchojuancho Posts: 9
edited 2007-12-03 08:35 in BASIC Stamp
i·have a motor mind·b connected to basic stamp 2 board (board of education) and following the schematic i had connected a dc motor. now what the shematic is not clear about is adding an additional external battery. any recomentations.

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2007-12-03 05:39
    Look at figure 2 of the Motor Mind datasheet which you can download from the product page for the Motor Mind on Parallax's web store.
    This shows a Motor Mind with an encoder (which you can ignore) and the connections for separate batteries, one 5V supply for the logic on the Motor Mind and one 12V supply for the motor. The motor supply doesn't have to be 12V. The datasheet gives the range of allowable voltage for the motor supply.
  • juanchojuancho Posts: 9
    edited 2007-12-03 06:31
    the problem is that im not sure how to connect the + and the - in the board. im scared to burn something out. sorry for posting it twis i thought the first one didnt go through.
  • Mike GreenMike Green Posts: 23,101
    edited 2007-12-03 06:58
    Look at Figure 4 of the datasheet. Ignore the 12V connection to the Stamp. You want to wire up the Motor Mind and the Stamp and the motor the way it's shown in Figure 4. If you wire the motor backwards, it will run backwards, but that won't damage it ... just change the motor connections and it will go the way you expect. The place marked 12VDC (or VMOTOR) gets connected to the positive wire from the motor battery. The place marked 5VDC (or 5V) gets connected to the Vdd connection on the Board of Education. The ground connection (or GND) gets connected to the Vss connection on the Board of Education and you have to connect the negative wire from the motor battery to the GND connection as well (on the Motor Mind).

    Does that help? If not, you will need to be much more explicit about what you don't understand.
  • juanchojuancho Posts: 9
    edited 2007-12-03 08:35
    i did conect it excatly as you suggested however it does not work
    let me explain what happen
    the first time i tried i connected the Vmotor to the Vss on the board which give 5V the motor did work for 10sec and then it shut off
    now if i connecte it this way the motor wont work and the red light on the motor mind come on
    so i thought maybe the voltage is low then i got a battery i connected the battery to the DC motor just to check if it still work and it did work
    now i have connected the way you suggested the red light is off however the motor does not work
    i would like to thank you very much for your help
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