I will use arduino uno board my project is sms type switch after power on restart arduino automatically
One help please after power on await automatically issue
But not use external battery any change in coding
Your topic was MOVED to its current forum category as it is more suitable than the original because it is not an Introductory Tutorial
OK, clearly English is not your mother tongue but you really must explain your requirement in a lot more detail. 
Start with a full explanation of the purpose, what parts you have (with Web links), which Arduino, a diagram of how you connected them and complete step by step details of what you want to happen.
Check out the instructions.
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