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This is the first hand-held RF Transmitter I made. The motive was prompted by discontinuing the Smoke Transmitter. |
This is the inside. The transmitter module on the beige board was re-cycled from a surplus moisture detector. It includes a loop antenna.
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Here is the circuit diagram. No current flows until a button is pressed, since the negative line is open. During operation the FET is closed by a voltage generated by rectifying a PWM output.
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Here is one version of the code. It gets changed sometimes.
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