SX 350 mod

[John Follis]

Hello all I'm looking to see if I can include a capacitive touch sensitve button like:
http://www.adafruit.com/products/13...XepljPWg0jaCQdvnlwEsk7hPRbq4o63VRdxoCs5Xw_wcB
to my first build.

sx-350 chip
hammond 1590b
19mm anti-vandal button
310 bigdaddy
two batterie holder 18650 (getting in mail soon, looking to wire in parrallel)

any help would be appreciated...and thank you all in advance for taking the time to comment..

-John

 

[Jazzman]

Hello all I'm looking to see if I can include a capacitive touch sensitve button like:
http://www.adafruit.com/products/13...XepljPWg0jaCQdvnlwEsk7hPRbq4o63VRdxoCs5Xw_wcB
to my first build.

sx-350 chip
hammond 1590b
19mm anti-vandal button
310 bigdaddy
two batterie holder 18650 (getting in mail soon, looking to wire in parrallel)

any help would be appreciated...and thank you all in advance for taking the time to comment..

-John

That looks to be the wrong touch sensor. It is a toggle so when you touch it, it will stay on until you touch it again. What you want is a momentary on so when you touch it, it will fire but when you remove your finger it will turn off. They have a momentary touch sensor here:

http://www.adafruit.com/products/1374

I haven't used either of these, but I'm pretty sure you want the momentary sensor.

 

[R Coy]

That's a toggle., not an on-off.

Yes. what he said.

 

[DrBeaker]

Omg! Thats awesome. I think it should work great.

That looks to be the wrong touch sensor. It is a toggle so when you touch it, it will stay on until you touch it again. What you want is a momentary on so when you touch it, it will fire but when you remove your finger it will turn off. They have a momentary touch sensor here:

http://www.adafruit.com/products/1374

I haven't used either of these, but I'm pretty sure you want the momentary sensor.

 

[DrBeaker]

Ok now that I have looked at this switch a little more closely. It is cool and all but to use it I think we need to do a little work. IE add a transistor as according to the description

"When a capacitive load is detected (e.g. a person touches the sensor-pad area) the red LED lights up and the output pin goes high."

From my work with the lighted led switches on the sx-350 the 2 wires that go to that crappy switch that comes on it one is a digital high and the other is just a ground and the + has to be pulled low to fire the unit.

Its an easy test to see if this is the case just take a ground from the battery or 510 connector and touch it to the positive side of the switch and see if it fires.

else we can just use a transistor and a resistor to pull the positive side of the switch to ground through the transistor from the high output on the capacitive switch.

Anybody else have any thoughts on this?

This is way cool I can just put a metal stud through my carbon fiber case and to the pad.

Also it says "We designed this breakout to have the more-responsive "fast mode" which draws about 0.5mA. If you need ultra-low (~50uA) power usage"

I am wondering how this this fast switching and current draw will work over time. Will it kill the battery just sitting around for a few weeks doing nothing?

I just ordered 2 so I will figure out how to make it work.

 

[Jazzman]

You might be right DrB. Please let us know what's needed to get this switch to work, it looks like an interesting switch to consider for future mods.

 

[DrBeaker]

I sure will... I think I have it figured out im my head anyway...

You might be right DrB. Please let us know what's needed to get this switch to work, it looks like an interesting switch to consider for future mods.