ESPHome SX127x driver.

SX127x component configures SX1276, SX1277, SX1278 or SX1279 hardware for use in ESPHome.

Tested with the LILYGO LoRa32 V2.1_1.6 board. Note the small 433 MHz antennas that come with these boards work fine but are not ideal. The antenna gain is really poor and it’s too close to the Wi-Fi antenna which can cause glitches. A proper antenna like the Siretta Tango 9 has better range and doesn’t glitch when Wi-Fi transmits.

When receiving OOK data rx_floor should be set appropriately for your environment / device / antenna. If the floor is set too high (ie closer to 0) the radio will ignore everything. If the floor is set too low (ie closer to -128) then noise will overwhelm remote receiver. To calibrate this it is recommended to set the log level to verbose and the remote receiver filter to 3us. Play around with the floor, -90 is a good starting point, it will be clear from the logs when too much noise is getting through.

Receiver example to use in ESPHome, timing data is read by remote receiver from GPIO32:

external_components:
  - source:
      type: git
      url: https://github.com/swoboda1337/sx127x-esphome
      ref: main
    refresh: 1d

spi:
  clk_pin: GPIO5
  mosi_pin: GPIO27
  miso_pin: GPIO19

sx127x:
  nss_pin: GPIO18
  rst_pin: GPIO23
  frequency: 433920000
  modulation: OOK
  rx_floor: -90
  rx_bandwidth: 50_0kHz

remote_receiver:
  pin: GPIO32
  filter: 255us
  idle: 2000us
  buffer_size: 100000b
  memory_blocks: 8
  dump: raw

Transmitter example to use in ESPHome, timing data is sent on GPIO32 by remote transmitter (ESPHome needs an API change so the transmitter start/stop is handled automatically):

external_components:
  - source:
      type: git
      url: https://github.com/swoboda1337/sx127x-esphome
      ref: main
    refresh: 1d

spi:
  clk_pin: GPIO5
  mosi_pin: GPIO27
  miso_pin: GPIO19

sx127x:
  id: sx127x_id
  nss_pin: GPIO18
  rst_pin: GPIO23
  frequency: 433920000
  modulation: OOK
  pa_pin: PA_BOOST
  pa_power: 17
  rx_start: false

remote_transmitter:
  id: remote_transmitter_id
  pin: GPIO32
  carrier_duty_percent: 100%

interval:
  - interval: 18sec
    then:
      - lambda: |-
          esphome::remote_base::RawTimings timings = {601, -613, 601, -613, 601, -613, 601, -613, 209, -405, 209, -405, 209, -405, 209, -405, 405, -209, 209, -405, 405, -209, 405, -209, 209, -405, 209, -405, 405, -209, 405, -209, 209, -405, 209, -405, 405, -209, 405, -209, 209, -405, 405, -209, 405, -209, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 405, -209, 209, -405, 209, -405, 405, -209, 209, -405, 209, -405, 209, -405, 405, -209, 209, -405, 209, -405, 405, -209, 209, -405, 209, -405, 209, -405, 209, -405, 405, -209, 209, -405, 209, -405, 405, -209, 209, -405, 209, -405, 405, -209, 405, -209, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 209, -405, 405, -209, 209, -405, 209, -405, 405, -209};
          auto call = id(remote_transmitter_id).transmit();
          call.get_data()->set_data(timings);
          call.set_send_times(2);
          id(sx127x_id).set_mode_tx();
          call.perform();
          id(sx127x_id).set_mode_standby();