Hi! I'm using the Esp32 MCU to generate a 40khz PWM signal and it works fine (image 1) but I have a noise in the other outputs that looks that in image 2.
Can someone give me an idea to eliminate that noise? Thanks
image # 1
I'm using this PWM signal to exit the fourth transducers, to do that I'm using the CD4052 multiplexer/demultiplexer, the PWM signal go to the X input and I change the output channel using the GPIO ping 6 and 7, also I'm getting the response of the transducers and conduce them to an amplifier using the Y output of the CD4052.
For example, I send the PWM signal to the X input and is sent to the transducer 1, at the same time I'm getting the response of the transducer 2 that is in front of the transducer 1, the response of the transducer 2 its send to an amplifier, I'm doing an ultrasonic anemometer.