- https://pypi.org/project/pyLoRa/
- https://github.com/rpsreal/pySX127x
- https://github.com/rpsreal/pySX127x/blob/master/LORA_CLIENT.py
https://wiki.wemos.cc/products:retired:d1_mini_v2.2.0
Start Arduino and open the Preferences window. Enter https://arduino.esp8266.com/stable/package_esp8266com_index.json into the Additional Board Manager URLs field (you can add multiple URLs, separating them with commas). Open Boards Manager from Tools > Board menu and install esp8266 platform.
- RadioLib by Jan Gromes (4.0.3)
- Optional: DHT sensor library for ESPx by beegee_tokyo 1.17.0
Select right board from board settings (in my case "LOLIN(WEMOS) D1 R2 & mini"). Wrong board might give weird results.
| RFM95 | Direction | ESP8266/Wemos/NodeMCU | ESP32 | ESP-201 |
|---|---|---|---|---|
| MISO/SDO (SPI) 🟤 | ← | D6 (GPIO12) (SPI MISO) | GPIO19 (VSPI MISO) | IO12 |
| MOSI/SDI (SPI) 🟠 | → | D7 (GPIO13) (SPI MOSI) | GPIO23 (VSPI MOSI) | IO13 |
| SCK/SCLK (SPI) 🟡 | ← | D5 (GPIO14) (SPI SCLK) | GPIO18 (VSPI SCLK) | IO14 |
| NSS/SS/CS (SPI) 🟢 | ← | D3 (GPIO0) | GPIO22 | IO0 |
| RESET 🔵 | ← | D8 (GPIO15) | GPIO5 | IO15 |
| DIO0 (IRQ) 🔘 | → | D2 (GPIO4) | GPIO21 | IO4 |
| GND ⚫ | G | GND | GND | |
| 3.3V 🔴 | 3V3 | 3V3 | 3.3V | |
| ANA/ANT | Antenna (86mm) |
| RFM95 | Direction | ESP8266/Wemos/NodeMCU | ESP-201 |
|---|---|---|---|
| MISO/SDO (SPI) 🟤 | ← | D6 (GPIO12) (SPI MISO) | IO12 |
| MOSI/SDI (SPI) 🟠 | → | D7 (GPIO13) (SPI MOSI) | IO13 |
| SCK/SCLK (SPI) 🟡 | ← | D5 (GPIO14) (SPI SCLK) | IO14 |
| NSS/SS/CS (SPI) 🟢 | ← | D3 (GPIO0) | IO0 |
| RESET 🔵 | ← | D4 (GPIO2) | IO2 |
| DIO0 (IRQ) 🔘 | → | D8 (GPIO15) | IO15 |
| GND ⚫ | G | GND | |
| 3.3V 🔴 | 3V3 | 3.3V | |
| ANA/ANT | Antenna (86mm) |
Warning: if DIO0 interrupt signal is triggered, ESP8266 doesn't boot up. This is safe wiring only if interrupt is not used.
Warning: If DIO1 is not utilized, RST cannot be GPIO0. This is Radiolib software limitation. jgromes/RadioLib#305
| ESP8266/Wemos/NodeMCU | Direction | ESP8266/Wemos/NodeMCU | notes |
|---|---|---|---|
| D0 (GPIO16) 🟣 | → | RST (ESP8266) | unconnect when flashing! |
High-Z = normal, low (>100us) = reset. Notice that Wemos/NodeMCU has pullup resistor for D3 and D4 and pulldown resistor for D8, so those cannot be in High-Z-state. Nevertheless it looks like D3 and D4 works for reset.
Normally low, high when active. DIO0 could be connected to D8, but then there is small risk that SX1276 interrupt is triggered when ESP8266 resets itself. Then D8 would be up and ESP8266 would not boot.
| Wemos/NodeMCU | GPIO | use | notes | ESP-201 |
|---|---|---|---|---|
| D0 | GPIO16 | in/out | No interrupts, no pullup feature, no PWM. Used to wake up from deepsleep. User-button is sometimes connected to this. | XPD |
| D1 | GPIO5 | in/out/SCL | I2C (ESP32: GPIO22) | IO5 |
| D2 | GPIO4 | in/out/SDA | I2C (ESP32: GPIO21) | IO4 |
| D3 | GPIO0 | out | Flash-mode. Flash-button in some modules. Must be high at boot up (boot mode selection). | IO0 |
| D4 | GPIO2 | out/led | Must be high at boot up (boot mode selection). Blue led in Wemos and NodeMCU. (I2S "LRCK" word select) | IO2 |
| D5 | GPIO14 | in/out/SCK | SPI | IO14 |
| D6 | GPIO12 | in/out/MISO | SPI | IO12 |
| D7 | GPIO13 | in/out/MOSI | SPI, if serial port flow control is used, this is CTS. | IO13 |
| D8 | GPIO15 | out | Must be low at boot up (boot mode selection). If serial port flow control is used, this is RTS. (I2S "BCK" bitclock) | IO15 |
| D9 | GPIO3 | x | Serial RX. (I2S "DIN" data) | RX |
| D10 | GPIO1 | x | Serial TX. | TX |
Serial.begin(115200, SERIAL_8N1, SERIAL_TX_ONLY, D10);
RegSyncWord (0x39) 7-0 SyncWord rw 0x12 LoRa Sync Word (Value 0x34 is reserved for LoRaWAN networks)