i want to dsign an ultrasonic insect repeller. i want frquancies from 40 to 75 , someone helped me designing the following code: int value,micro; void setup() { // put your setup code here, to run once: pinMode(7,OUTPUT); } void loop() { // put your main code here, to run repeatedly: value=…

how can i display high frequencies (40kHz to 75 kHz)

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