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3rd February 2008, 08:53 AM
| #1 |
 Making simple robot
If you've ever watched battle bots or robot wars on the television, then you'll understand what this is. I'm using diodes and relays to use a small 9 volt rc circuit to power a large DC motor with two 12 VDC batteries. Now, the power coming out of the PFM circuit (remote control, PFM meaning Pure F**king Magic) is only two volts, ant I need more power to actually work the relays. The problem is I can't add more power to the PFM circuit because I might fry it since it's little and cheap. I remember from my "tech core" class back at my old training command (I'm a radar tech in the Navy) that transistors were a great way to amplify power, but it's been quite a while. If anyone has any advice I'd be most greatful.
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3rd February 2008, 09:07 AM
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You are going to need to use the PFM outputs to drive the gates of some MOSFETs where the source and drain of the MOSFET transistor (an NMOS specifically, just makes things easier rather than a PMOS) where the NMOS's source is connected to ground and the NMOS's drain is connected to the one end of the relay coil (The other end of the relay coil is connected to the voltage. It is similar to using the PFM output to drive smaller relays that can be turned on by 2V but can pass larger currents that are capable of turning on your main relays. It MIGHT work since 2V is pretty low and you would have to pick a low threshold MOSFET whose gate can be triggered with that voltage. Add diodes in ANTI-PARALLEL with the relay coil so that the voltage spike produced by cutting off current flow through the inductance int he coil when you turn the thing off won't destroy your transistors- anti-parallel meaning in parallel with said coil, but not so current can normally flow. Just like the transistor and motor in this schematic: http://www.dprg.org/tutorials/2005-11a/2005-10a-004.gif except that your PFM circuit is driving the gate instead of the 555 timer on the left, and the motor is your relay coil. THis diagram does not show the high-speed low voltage diode (like a schottky diode) that should goes in anti-parallel with the inductive load (the motor in the schematic or in your case your relay coil) to give the inductive flyback current a path to flow when cutting power to the coil, otherwise it will give the current a path to flow by producing a voltage spike until something gives. Obviously the voltage "above and below" the drain and source of the transistor is the voltage required to turn on your relay coil, and not the voltage of needed by your motor itself (that's somewhere around the primary terminals of your relay).. Last edited by dknguyen; 3rd February 2008 at 09:14 AM. | |
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13th June 2009, 04:32 PM
| #3 |
| take knowledge on robotics language
i want knowledge on robotics language , so pls give what i want ,i m very confused,pls help me......   | |
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13th June 2009, 04:34 PM
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13th June 2009, 06:31 PM
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Contrary to popular belief, English is not the hardest language to learn, ROBOT is the hardest language to learn.
__________________ IF YOU WANT TO HELP FINE IF NOT PLEASE DON"T PEE IN MY CHEERO'S | |
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19th June 2009, 03:17 PM
| #6 |
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01001111.01101000.00101100.00100000.01101001.01110 100.00100000.01101001.01110011.01101110.00100111.0 1110100.00100000.01110100.01101000.01100001.011101 00.00100000.01101000.01100001.01110010.01100100. (oh, it isnt that hard) | |
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19th June 2009, 06:35 PM
| #7 |
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There are 10 types of people; those that know binary... and those that don't | |
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19th June 2009, 08:04 PM
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Isn't Robot similar to Vulcan?
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19th June 2009, 09:06 PM
| #9 |
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This should get you going: Q=2N2222. Should be good up to about 100mA Last edited by BrownOut; 19th June 2009 at 10:05 PM. | |
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20th June 2009, 01:59 AM
| #10 |
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I would use a 2n3904 they can go 300 mA
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20th June 2009, 02:24 AM
| #11 | |
| Robot Language Quote:
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20th June 2009, 06:56 PM
| #12 | |
| Quote:
microtexan: i decoded it to make sure lol it was hard lol
__________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ | My YouTube Videos! My Favorite Store: dipmicro Electronics | ||
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20th June 2009, 08:08 PM
| #13 |
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That's a lot of 0's and one's just to say "Oh, it isn't that hard" it's not hard Binary to Text (ASCII) Conversion 01000010011001010010000001110011011101010111001001 1001 01001000000111010001101111001000000110010001110010 0110 10010110111001101011001000000111100101101111011101 0101 11001000100000010011110111011001100001011011000111 0100 01101001011011100110010100101110 Last edited by be80be; 20th June 2009 at 08:10 PM. | |
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20th June 2009, 08:10 PM
| #14 |
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thats cheating tho i used a calculator and ascii chart lol
__________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ | My YouTube Videos! My Favorite Store: dipmicro Electronics | |
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24th June 2009, 05:06 AM
| #15 |
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If you consider that cheating you should stop using your computer and go back to using an abacus.
__________________ Tanaka Sensei (avatar) says: Please spell it "ridiculous" correctly! Not "rediculous". ^^ | |
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| making, robot, simple |
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