====== Components ======

:?: Most of my component recommendations are in [[projects:amateur_radio:buyers_guide]].

===== Microcontroller Development Boards =====

==== Espressif ESP32 ====

FIXME

==== Nordic nRF52840 ====

[[https://www.nordicsemi.com/Products/nRF52840|Nordic nRF52840 product page]];

  * [[https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html|Seeed Studio XIAO nRF52840]]
  * [[https://www.seeedstudio.com/Seeed-XIAO-BLE-Sense-nRF52840-p-5253.html|Seeed Studio XIAO nRF52840]]

==== STMicro STM32WL ====

[[https://www.st.com/en/microcontrollers-microprocessors/stm32wlex.html|STM32WLEx product page]]; note that this MCU has an integrated Semtech SX1262.

Meshtastic firmware support is still WIP (booting and functional, but no writeable configuration storage); see [[https://github.com/meshtastic/firmware/issues/2539|[Board]: STM32WL (Seeed Studio Wio-E5) #2539]]

  * [[https://www.seeedstudio.com/LoRa-E5-mini-STM32WLE5JC-p-4869.html|Seeed Studio Wio-E5 mini Dev Board]]

===== LoRa Modules =====

:!: Note: Meshtastic only supports modules with SPI connectivity; UART modules are not supported.

==== Semtech SX1262 ====

=== EBYTE E22-900M30S ===

  * Product page: [[https://www.cdebyte.com/products/E22-900M30S|EBYTE E22-900M30S]]
  * Features
    * Tx PA: +10 dBm (maximum output power: 30 dBm)
    * Rx LNA: +2 dBm (-150 dBm Rx sens. versus stock -148 dBm)

Note: Transmit power of SX1262 must be configured per the table below to achieve the desired transmit power (data provided by EBYTE by email):

^ SX1262 Tx Power (dBm) ^ Actual Tx Power at 868 MHz (dBm) ^ VIN Current (mA) ^
| 20 | 30.54 | 618.12 |
| 17 | 27.98 | 518.43 |
| 14 | 24.75 | 440.35 |
| 11 | 21.73 | 398.87 |
| 8 | 18.81 | 377.56 |
| 5 | 15.67 | 366.21 |
| 2 | 12.88 | 352.61 |
| -1 | 9.92 | 344.76 |

=== EBYTE E22-900M33S ===

  * Product page: [[https://www.cdebyte.com/products/E22-900M33S|EBYTE E22-900M33S]]
  * Features
    * Tx PA: +25 dBm (maximum output power: 33 dBm)
    * Rx LNA: ? dBm (typical receive sensitivity: -135 dBm

Note: Transmit power of SX1262 must be configured per the table below to achieve the desired transmit power (from datasheet page 5):

^ SX1262 Tx Power (dBm) ^ Actual Tx Power at 850 MHz (dBm) ^
| 8 | 33.0 |
| 5 | 31.6 |
| 3 | 30.0 |
| 0 | 27.2 |
| -3 | 23.6 |
| -6 | 20.4 |
| -9 | 17.2 |