The output of the Pololu switch is active-*high*. The input to the marker is active-*low *(the trigger is a low-side switch). The digital signal needs to be inverted. (Note: The latest version of the Pololu series of switches has an "inversion" function but this changes the direction of the activation signal (from "above center' to "below center". I believe it addresses the need to flip the controls of a combat robot when it has been "inverted", *i.e.* turned upside down.)
I connected a 1K resistor to a +5V active digital output of a microprocessor to feed the base of a small, general-purpose NPN transistor connected across the trigger contacts (emitter to the black wire, *i.e.* marker ground) of my electronic marker and it works fine. A 1 ms "on" time (the shortest "pause" time on the PICAXE I'm using to test) is plenty. I assume the same solution would work for the Pololu Digital Switch. For this application (R/C firing of an electronic marker) I recommend the Pololu Switch with Small Low-Side MOSFET. The extra cost $1.26 more than the Digital Switch, less the resistor and transistor) is justified by the simple implementation (see above <https://groups.google.com/d/msg/rctankcombat/hu2G5C2fVzo/UG0uZ0niHzsJ> ). On Friday, October 10, 2014 12:19:41 PM UTC-4, Mike Lyons wrote: > > ... > Challenge: Explain the problem. Hint: All you need to know is in this > discussion thread over the last few days. > On Wednesday, October 8, 2014 2:38:02 PM UTC-4, Frank Pittelli wrote: > > The switch on the e-trigger is a standard active-low input to > a micro-processor I/O port ... -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com 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 rctankcombat+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
