4.1 the problem is that the output from the receiver is not a digital logic signal in the high/low sense of the word. Its a ~50hz signal who's duty cycle varies with the position of the stick. Hence why you need a servo switch.
Thanks for clarifying that Frank. For some reason I thought you meant a MAG style switch to energise the FET. I dont trust opto-isolators to handle the spike from an inductive load like a solenoid. Replacing the e-trigger with one could work, but directly energising the solenoid off it doesnt appeal to me. On Wed, Oct 8, 2014 at 6:24 PM, Frank Pittelli <[email protected]> wrote: > There always has to be some sort of electronic interface between the R/C > Receiver and the door-lock (or e-trigger) solenoid and Mike has been > cataloging the various ways that can be done. > > Option (a) below is the simplest solution, that anyone can implement with > only basic tools and wiring skills. It can also be done for less than $5 > using readily available parts from surplus catalogs. It also doesn't > require any modifications to the marker. > > Options (b), (c) and (d) below don't use a "servo", they use a "servo > switch" which is "an electronic circuit that accepts a servo input signal > and then switches something". The most common servo switch circuits use a > simple micro-processor to read the servo signal and trigger the switch. > Old-timers used a 555 and an assortment of other components to achieve the > same goal but that's horse-and-buggy type stuff. > > Mike listed some servo switches that are commercially available, all of > which can be used to operate a door-lock actuator or switch an e-trigger > circuit. When used with a door-lock actuator, no marker modifications are > required. When used with the e-trigger mechanical switch, you need only > solder a pair of wires between the mechanical switch and the servo switch. > > Option (d) is a prototype circuit board used in the most recent battles > that can drive the e-trigger solenoid directly from a servo signal. It > requires the most drastic changes to the marker, disconnecting the solenoid > from the e-trigger circuit and connecting it to the servo switch board. > > I guess we should also include an Option (e) which is an > "Opto-isolator-based Servo Switch". They provide isolation like a > mechanical relay without any moving parts, but they can't handle as much > current as a FET or relay. Relays, FETs and opto-isolators are the most > common approaches for switching something, with various advantages and > disadvantages that keep them all in use. > > On 10/8/2014 5:17 PM, isaac goldman wrote: > >> Why does there have to be a servo involved? You can fire a door lock >> solenoid with only electronics quite easily. Or am i misunderstanding? >> >> Ill post a circuit later tonight. >> >> On 2014-10-08 5:12 PM, "Frank Pittelli" <[email protected] >> <mailto:[email protected]>> wrote: >> >> a) Servo & Mechanical Switch >> b) Relay-based Servo Switch >> c) FET-based Servo Switch >> d) Prototype CCS Servo Switch (FET-based) >> > > -- > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to [email protected] > To unsubscribe, send email to [email protected] > Visit the group at http://groups.google.com/group/rctankcombat > > --- You received this message because you are subscribed to the Google > Groups "R/C Tank Combat" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- Isaac Goldman 5142334423 This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
