With is project I designed my own Radio broadcasting panic alarm. You can click on the picture to watch a video of it in action. What you will be hearing is the Arduino being engaged via a push button then keying up the radio and broadcasting a prerecorded message. The volume is a little lower due to an impedance mismatch between the Arduino out put pin and the Radios input pin which is 600 Omhs for use with telephone lines. This would be fixable with an impedance matching current.
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