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tx_module.md

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Building the TX module for the radio

Required materials

For building the module, you'll need:

  • 1x ESP32+LoRa board (screen is highly recommended, but not required) such as this one.
  • 1x IPEX to SMA pigtail, depending on the ESP32 modules you purchased (some modules come with one). Note that for optimal performance, you should make sure that feed line to the antenna has the approppriate size.
  • 1x 5V Linear regulator (don't use a switching one!) with at least 1A output current. For example, L7805CV.
  • 1x General purpose diode, to allow connecting the TX module via USB while the module is also being powered on by the radio. You can use 1N4148.
  • 1x 6mm tactile switch. A taller one (8mm tall, same 6mm width) might fit some module cases better. Link.
  • 1x 5 pin dupont connector with 5x female pins. Link. Note that the listing has multiple sizes, make sure you select 5 pins.
  • 1x Breadboard for soldering the components. Best size will depend on your skill level. Safest bet is to order a kit with several sizes, but you might need to cut one anyway. Use a sharp knife or a dremel-like too, whatever you feel more comfortable with.
  • 1x 3D printed module case.

Required tools

  • Soldering iron.
  • Dremel-like tool (optional, for cutting the breadboard).
  • 3D Printer.

Build

Wire the the components according to the following schematic. (click for a bigger version)

Pay attention to your specific board pinout, the 5V, GND and 13 pins might be in another location

TX Schematic

Which means:

  • Bottom pin of the bottom bay is S.Port. Wire it pin 13 in the board.
  • Next pin from the bottom in the module bay is ground. Connect it ground on the board.
  • Third pin from the bottom is the battery voltage. Wire this to the V input of the 5V regulator.
  • Connect the GND leg for the 5V regulator to any of the other GND points.
  • Connect the output of the 5V regulator to the diode anode (the side without the mark).
  • Connect the diode cathode (the side with the mark) to the 5V pin in the board.
  • If your module only has a reset button solder the additional switch between the GND and GPIO0 pins.

Print a case

Cases for TX modules are available in the cases/tx directory.

Fire it up!

Continue with the Getting started document for basic usage instructions.