[Solution puce]：Solution LoRa
[Puissance d'émission]：22 dBm
[Distance de communication]：5 km
[Dimensions du produit]：14 x 20 mm
[Introduction]：EWM220M-900T22S Le module de transmission sans fil transparent est une nouvelle génération de module de port série sans fil LoRa (UART). Il offre plusieurs modes de transmission, fonctionne dans la bande de fréquences 850,125-930,125 MHz (par défaut 868/915 MHz), utilise la technologie LoRa à étalement de spectre, dispose d'une sortie TTL et est compatible avec les tensions de port d'E/S 3,3 V et 5 V. Ce module LoRa offre une longue distance de transmission, une vitesse élevée, une faible consommation d'énergie, un format compact et un excellent rapport qualité-prix. Il prend en charge le réveil radio, la surveillance de la porteuse, la clé de communication et d'autres fonctions, prend en charge le réglage de la longueur des sous-paquets et propose des services de développement personnalisés.
Magasin officiel
| Pin number | Pin Name | Pin Direction | Pin Purpose |
| 1 | GND | - | Module ground wire |
| 2 | NC | - | Empty foot (not open for use, users do not need to care) |
| 3 | GND | - | Module ground wire |
| 4 | GND | - | Module ground wire |
| 5 | TX_EN | Output | Used with RX_EN to control external PA; left unconnected if not used |
| 6 | RX_EN | Output | Used with TX_EN to control external PA; left unconnected if not used |
| 7 | CLK | Input/Output | SWCLK Clock pin when program is loaded (suspended, user does not need to connect) |
| 8 | PART | Input/Output | SWDIO data pin when program is loaded (suspended, user does not need to connect) |
| 9 | NC | - | Empty foot (not open for use, users do not need to care) |
| 10 | NC | - | Empty foot (not open for use, users do not need to care) |
| 11 | NC | - | Empty foot (not open for use, users do not need to care) |
| 12 | NC | - | Empty foot (not open for use, users do not need to care) |
| 13 | GND | - | Module ground wire |
| 14 | VCC | - | Module power positive reference, voltage range: 2.7～5.5V DC |
| 15 | TXD | Output | TTL serial port output, connected to the external RXD output pin; |
| 16 | RXD | enter | TTL serial port input, connected to external TXD output pin; |
| 17 | M1 | enter | Cooperate with M0 to determine the 4 working modes of the module ( cannot be left floating , can be grounded if not used) |
| 18 | M0 | enter | Cooperate with M1 to determine the 4 working modes of the module ( cannot be left floating , can be grounded if not used) |
| 19 | TO | Output | Used to indicate the working status of the module; the user wakes up the external MCU, and outputs a low level during the power-on self-test initialization period; (can be left floating) |
| 20 | NC | - | Empty foot (not open for use, users do not need to care) |
| 21 | RESET | enter | Module reset pin, low level reset. |
| 22 | GND | - | Module ground wire |
| 23 | ON | - | Antenna interface (high frequency signal output, 50 ohm characteristic impedance) |
| 24 | GND | - | Module ground wire |