■ FIGURE 11. Here’s the
placement of parts for the
temperature sensor array.
heat and let cool.
6) Slide heat shrink over the exposed
solder joint and shrink.
though that each LM335 is soldered
to the ends of three wires. The cable
allows each LM335 to be routed to
experiments that are remote from the
PCB. Here’s how I solder a LM335 to
the end of a cable:
three wires in the cable and tin.
3) Slide 1/2 inch long heat shrink
tubing over the wires in the cable.
1) Cut the leads of a LM335 to half
their length and tin.
4) Press the LM335 lead against the
bare end of a wire and heat with a
2) Strip 1/4 inch of insulation from the
5) After the solder in the LM335 lead
and wire fuse together, remove the
This process beats twisting and
soldering the wires together and it’s
strong enough for the LM335s. One
thing however, be sure you have the
LM335s in the correct orientation
before soldering its leads to the
wires in the cable. It won’t work if it’s
backwards (like most things in life).
To keep the cable neat and tidy,
twist the wires in each cable together.
Notice that only two wires are really
needed to solder the LM335 to the
PCB. I recommend using all three
wires to make the cable stronger.
After assembling a cable, wrap its
temperature sensor with a small sticky
label that has the sensor’s channel
printed on it. Then shrink clear heat
shrink tubing over the label to protect
it. You’ll appreciate seeing these labels
on your sensors when you’re putting
your experiment together. By the way,
be sure to write down the channel of
each temperature sensor and its
experiment during assembly. You’ll
need that information when you put
the spreadsheet together.
The last cable is the interface to
the ADC of the flight computer.
Terminate it just like the other sensors
in this article with a 3 x 4 male header
and heat shrink. If you don’t have
access to three row male headers, then
use two 2 x 3 headers to terminate it.
■ FIGURE 12
OUTPUT FROM THE
Since the temperature sensor
array uses the same temperature sensor as the miniature near space weather station, use the same Excel formula.
The chart in Figure 12 is an
example of the data that I’ve collected
from the temperature array sensor.
The temperature probes were routed
to four cubes: one was a plain blue
Styrofoam; the second, a Styrofoam
cube covered in black construction
paper; the third, a cube covered in
multilayer insulation (MLI — see note