โ†‘LLCC68 LoRa 868MHz 915MHz ๋ฌด์„  ๋ชจ๋“ˆ 22dBm ์žฅ๊ฑฐ๋ฆฌ 5km CDSENET E220-900T22D SMA-K UART RSSI ์†ก์‹ ๊ธฐ ์ˆ˜์‹ ๊ธฐ DIP - TopDealBox