Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
A switch from a servo board?
Can the control board of a servo be used as a solid state switch? I am thinking that the motor could be pulled from the servo and the power, that normally would turn the motor, could trip a relay. Would this work? I am looking your way, Brett. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sun Jun 12, 2005 6:45 pm
ffej Experienced Roboteer
Joined: 22 Jun 2004
Posts: 595
Location: Kurrajong, NSW
Sure can . . . . this was how the weapon on the original catalyst was operated, made a schematic on how to do it a while back . . . considering your still using a relay, its not exactly solid state, but still works reasonably well.
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
I am looking at activating a solenoid valve that requires 6v an 0.67 W. Will the servo control board supply this without a relay? _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sun Jun 12, 2005 7:22 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
well 6v would require you run the servo off 6v, most are good for that.
0.67w and 6v is some 0.1A which sounds about what a servo motor would draw under load. give it a crack and see, id like to know the results too _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Sun Jun 12, 2005 8:13 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
I might just have a go and see what happens. I don't have the valve that I would like to use. I could set up a dummy load and test that. I only want to power it for less than one second.
It is for Alex's Yamato battleship. I would like to use an electronic valve to fire the CO2 canons. The more common way is to have a servo push a button to fire the canons resulting in a time delay.
You don't want any delay when you are passing an enemy ship and he is returning fire. Alex will be able to deliver a 27 ball bearing broadside. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sun Jun 12, 2005 8:22 pm
Totaly_Recycled Experienced Roboteer
Joined: 15 Jun 2004
Posts: 1346
philip i use a servo board in Sproing to turn on a drill fett to trigger a relay if you are only going to trigger a single coil you could use this and do away with the relay altogether..you could posibly just use the servo if you only want to switch at 6 volts i use 7.2 packs on the servos in T2M and drive 4 fetts directly off it you will probaly just ned a 1 amp diode and a small capacitor to hold the voltage as the servos actualy pwm .
Sun Jun 12, 2005 8:31 pm
ffej Experienced Roboteer
Joined: 22 Jun 2004
Posts: 595
Location: Kurrajong, NSW
Just use my circuit, run 6V instead of 12, and put the valve in place of the relay. _________________ Jeff Ferrara
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Sun Jun 12, 2005 10:06 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
quote:Originally posted by Totaly_Recycled:
i use 7.2 packs on the servos in T2M and drive 4 fetts directly off it.
Another thing that Yamato will need is speedos. It will be pulling less than 10 A. The guys tell me they use about 2 A constant. How hard would it be to make a pair or speedos for this using the servo boards?
Waterproof speedos are about $80 each. They give 50A forward and 10A in reverse. It would be good if I could have a cheaper board and just put some FETs onto it. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Mon Jun 13, 2005 7:30 am
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
I bought the solenoid yesterday. It is a Clippard EV-3-6. Today I pulled out a servo board and removed the motor, as discussed above. The board powers the solenoid quite easily. The solenoid was switching on at about 0.3v without any air pressure.
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