基于51单片机，通过GSM模块短信遥控多路开关.购买的是联通的不记名卡，实测有效，但短信接受偶尔有10秒以内的延迟.-Based on 51 single-chip, via GSM SMS remote multiplexer module. Purchased Unicom anonymous card, the measured effective, but occasionally there is a delay accepting messages within 10 seconds