A working burglar alarm design for frequency 450MHz in a software
June 22, 2020
If you mean that the raise up and raise down of a "square" wave is to be generated by software, that implies 2 clock cycles just for the two raises, plus the branch instruction, giving a strict minimum of 1.3 GHz CPU/MCU to be used with a strictly optimized op-code. Not the cheapest solution available to us.
On the other hand, if your question is about starting or stopping the alarm, it is a matter to detect an event, which can be done with an elementary code on an Arduino or an MSP432, since it is the same as "reacting" to a push-button, as example. The exact code depends on the MCU that you will use. Note that there is no absolute need of any software, CPU/MCU, if your goal is simply to start, or stop, an alarm, ... as it should be evident.
More details about your case could be beneficial.
June 24, 2020
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