First, let's solder the Solar Lithium Charger

USB / DC / Solar Lithium Ion/Polymer charger - v2

This handy component will be used to regulate solar power from the solar panel and safely charge the lithium battery. The lithium battery will be powering the CPX. The reason the capacitor is so large is that it is needed to stabilize the solar panel as the current can be quite high. For extensive information on the Solar Lithium Charger check out the guide.

  • First let's solder on the red and black wired JST connector to the "LOAD" side of the charger.
  • Next we'll solder on the capacitor. Make sure the longer leg is put through the positive hole.
  • The JST connector will eventually be plugged into the CPX to power it.

Next we'll solder the DS18B20 temperature sensor to the CPX.

Waterproof DS18B20 Digital temperature sensor + extras
  • We need the 4.7K resistor to be between the power (red) and data (yellow) lines. We solder the resistor on accordingly.
  • Next wrap the blue line around the GND on the CPX. Specifically theGND next to the micro usb port.
  • Wrap the red line around the 3.3V specifically the one on the other side of theGND we just wired.
  • Wrap the yellow line on A3 input.
  • Solder the wires in place and cut off the excess resistor / wire.
  • Find further information on the DS18B20 temperature sensor here.

Now we'll solder the moisture nails to the CPX.

Silicone Cover Stranded-Core Wire - 2m 26AWG Red
  • Cut two 12" of pieces of 22 - 28 gauge stranded wire.
  • Remove about 0.5" of wire wrap on each end.
  • Wrap the end of one wire to A1 on the CPX and the other toA2.
  • Solder the wires in place.
  • Wrap the other sides to the two nails.
  • Solder them to the nails.
  • Cut two 1" pieces of 3/8" heat shrink
  • Slide them over the the nail until the nail tops are in the center of the heat shrink.
  • Use a lighter, match or other heat source like the hot body of a soldering iron (not the tip) to activate the heat shrink.
Connect the CPX to your computer to make sure the sensors are working and that all the connections are good before we move on.

Soldering the DC jack

Waterproof DC Power Cable Set - 5.5/2.1mm
Cable Gland PG-9 size - 0.158" to 0.252" Cable Diameter - PG-9

In order to keep the power line from the solar panel, as well as the enclosure waterproof, we will have to place a cable gland though the DC lines before we solder them together. We must do this because the gland does not fit over the thick part of the jack.

  • Take one of the cable glands, unscrew the smaller piece off and keep it close by (we'll need it later). Slide the gland over the male DC jack end.
  • Cut a 3" piece of 1/4" heat shrink and slide it over the female DC jack end.
  • Next cut two 1.5" pieces of 3/32" heat shrink and slide each on over the ground (black) and power (red) wires.
  • Solder the male and female DC jack ends together (black to black and red to red).
  • Slide the smaller heat shrink over the ground and power. Activate heat shrink with a heat source.
  • Slide the larger heat shrink over the wires and smaller heat shrink. Activate heat shrink with a heat source.

Now that we have things soldered up, we'll have to mount it all to the enclosure!

This guide was first published on Aug 29, 2018. It was last updated on May 29, 2024.

This page (Soldering) was last updated on Mar 08, 2024.

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