如何防止其他電話/手機號碼向 Arduino 發送 SMS 命令? [英]How to prevent other phone/mobile numbers to send SMS command to Arduino?
有沒有辦法使用 arduino 和 gsm 模塊一次撥打多個電話號碼? [英]Is there any way to ring multiple phone number at once using arduino and gsm module?
如何在命令中輸入PIN碼? 我試圖跟隨沒有成功 [英]how to enter PIN number at command ??? I have tried to following to no success