when i tried to combine ultrasonic, the output from serial monitor is zero. either problem with my coding.?for tx code #include <SPI.h> #include <Mirf.h> #include <nRF24L01.h> #include <MirfHardwareSpiDriver.h> #define trigPin 5 #define echoPin 4 int rate, duration; long previousMillis = 0; long i…

problem with the hc-sr04 with nrf240l01

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