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This has a positive and a negative wire only, and no data connection wire.Much like a DC motor.
What I am wondering is if I can run the red linear actuator wire to a 12V power source, and the black linear actuator wire to a i/o pin on the mcu, so that when the pin goes low, it is connected, and when the pin goes high it is disconnected.
Hi,Quote from: ErikY on August 08, 2012, 01:45:18 PMThis has a positive and a negative wire only, and no data connection wire.Much like a DC motor.It is a DC motor.If it hasn't got end stop switches, you need to use over current detection to break the power when at either end.Quote from: ErikY on August 08, 2012, 01:45:18 PMWhat I am wondering is if I can run the red linear actuator wire to a 12V power source, and the black linear actuator wire to a i/o pin on the mcu, so that when the pin goes low, it is connected, and when the pin goes high it is disconnected.Let's pretend that you never suggested pulling 9A through an I/O pin Besides, even if it could handle the current (eg. by a transistor in-between), how about reversing direction?Here is a cheap way to get both directions and not frying your controller in the process http://That.Homepage.dk/PDF/PWM+Relay_4_Motor_Ctrl.pdfThe relay makes the equivalent of an H-bridge and the MOSFET makes it PWMable (so that you can control the speed of it. If you don't need that, a relay (with a driver is all it takes - plus an over current detector if there's no end stop switches as mentioned (Now you wish you had included a link )
First off, the linear actuator does have built in limit switches, so that is a plus.
Is SV1 what connects to my mcu?
I am assuming the V+ and V- are dedicated 12V from a battery source?
There is also a circle with a rectangle around connecting to transistor bd140, what is that?
Also, the 4 circles on the corners of the silksreen, are those for mounting the board?
For the DPDT relay, what is the 351 representing?
Hi,Quote from: ErikY on August 09, 2012, 07:55:59 AMFirst off, the linear actuator does have built in limit switches, so that is a plus.Yes, you can feed them to I/O lines w. pull-up either internal or physical resistors from the I/O to Vdd (+5V or whatever you use). The other end of the switch should go to ground (twisting the wires going to each switch around 3 times per inch will make it more immune to motor noise). You could feed both switches to a single line, if your pin "budget" is tight and then keep track of direction in software (assuming you either extend or retract it completely on power up, to know where it is).Quote from: ErikY on August 09, 2012, 07:55:59 AMIs SV1 what connects to my mcu?Yes, the layout is made for "Berg pins" (the pin rows w. square pins that's used in almost all controller boards) - soldered wires would work if needed.Quote from: ErikY on August 09, 2012, 07:55:59 AMI am assuming the V+ and V- are dedicated 12V from a battery source?There's no V-, but you probably mean the 0V and if so, yes, and the relay should be 12V as well.Quote from: ErikY on August 09, 2012, 07:55:59 AMThere is also a circle with a rectangle around connecting to transistor bd140, what is that?Assuming you mean on the overlay (I stared at the schematics for a couple of minutes and didn't know what you were on about ) - it's the BD140 itself. It's because of the symbol I used was for a transistor bend down flat on the board and the circle is the "no-go" area, had it been inside the copper pour, but it should be mounted standing up.Quote from: ErikY on August 09, 2012, 07:55:59 AMAlso, the 4 circles on the corners of the silksreen, are those for mounting the board?Yes.Quote from: ErikY on August 09, 2012, 07:55:59 AMFor the DPDT relay, what is the 351 representing?It's just the relay symbol I used (a relay called 351). If you intend to make a PCB, wait until you have a suitable relay (they come in all sorts of pinouts), then, if it doesn't fit the one I used, give me a link to a datasheet containing the physical measures of it (and it's pinning) and I can modify the layout to suit.If you can't find a DPDT relay that can handle the needed current, two SPDT or DPST can be used instead.For larger currents, automotive relays are quite cheap compared to their current handling capacity.
i wanna know above ckt designed for how much current ratingI have linear actuator @24 v dc 10A running over battery .i wanna controlled the action trough MCU 5v ttl @ 50mahow could above ckt help me