Specifications

Using Your Remote Switch
Mounting the Remote Switch in Your AV Bay
The Remote Switch has two #4 holes for mounting in a AV bay sled. It’s about 2.5” x .9”, so
you’ll need to make sure that you have enough room on your sled for it. It doesn’t matter
which way you mount it, as long as it’s mounted so the circuit-side is facing outwards. There’s
a drilling template on the Eggtimer Rocketry web site, we recommend that you download it,
print it, and cut it out with scissors so you can drill the mounting holes accurately.
Our favorite mounting method is to use two #4 hex-head cap screws, about 3/4” long, and a
short (about 1/8”) piece of ¼” i.d. rubber tubing to act as a spacer between the bottom of the
PC board and the sled. We hold it on with nylon-insert nuts… they don’t work loose. If you
mount it like this, you can pretty much use whatever monster motor you may have on-hand
(like the infamous O5800, for example) without fear of anything coming loose.
For rockets with somewhat lesser acceleration, we’ve used double-stick foam tape (“servo
tape”), it works just fine. Be sure to cover the bottom completely, and make sure that whatever
surface you’re attaching it to is nice and clean; any dirt will get between the adhesive and the
board, and keep it from sticking.
We generally recommend that you try to mount the Remote Switch as close to the battery and
your altimeter as possible, and keep the wiring as short as possible. Small zip ties work really
well for tidying up the wires. Also, we strongly recommend that you zip tie the wires
connected to the Remote Switch to your sled, to provide strain relief for them. In general, if a
wire can’t move, it won’t come loose. Enough said…
Connecting To Your Electronics
The Eggtimer Remote Switch is designed for a battery from 6V-20V, this fits in nicely with the
requirements of most hobby rocketry electronics (which typically use a 9V alkaline battery or a
2S/7.4V LiPo battery). Since the Remote Switch is designed to be used with a variety of
different batteries, we don’t provide a battery connector; you’ll need to get whatever connector
matches the battery that you’re using. Note that the Eggtimer Remote Switch can NOT be
used with an altimeter that uses a 1S/3.7V LiPo battery; the Remote Switch’s RF module runs
on 5V, and 3.7V just isn’t enough. Fortunately, almost all of them out there use 9V or 2S/7.4V
batteries.
Loosen the screws on the INPUT side of the screw terminal block, and connect your battery
connector to it. Usually, the “+” side of the battery will be RED and the “-“ side will be
BLACK; if you are not 100% sure, use a DVM to confirm the polarity BEFORE you connect a
battery. Tighten the screws firmly. If you are using stranded wire, you may want to tin just the
very end of the wire to prevent it from fraying; a loose strand of wire can short out the battery,
which can cause a fire if you’re using LiPo batteries, so check your connections carefully to
make sure that there are no shorts.