โ†‘433MHz LLCC68 LoRa 470MHz ๋ฌด์„  ๋ชจ๋“ˆ 22dBm ์žฅ๊ฑฐ๋ฆฌ 5km CDEBYTE E220-400T22D SMA-K UART RSSI ์†ก์‹ ๊ธฐ ์ˆ˜์‹ ๊ธฐ SEMTECH - TopDealBox