The teacher make a AD sampling, recently a little confused

CodePudding user response:

Does not belong to, the ultrasonic ranging principle: SCM ultrasonic ranging is through continuous detection of ultrasonic reflection echo encountered obstacles, after launching to determine in transmitting and receiving the echo time t, then calculate distance,

Distance formula: s=ct/2,

CodePudding user response:

Vibration of analog output module and range of infrared module and analog output

CodePudding user response:

The change of the AD conversion can measure current, temperature of anything

CodePudding user response:

Should belong to, although it is a reaction distance by measuring the time difference, but time is the last is analog signal into digital signal output

CodePudding user response:

Thought it would be yes, should set the threshold the returned signal can be higher than the threshold is identified

CodePudding user response:

Must belong to the ah, ultrasonic sensor output is electricity (simulated) signal, is converted to digital signals through the application of AD

CodePudding user response:

Generally do not belong to, because time is accurate,
There are two kinds of usage, is a kind of speed, using the method of the doppler effect, measuring the phase difference between the transmission and reception and its change, is of course the precise timing, peripheral complete recognition to enlarge,
Another kind is the time difference between simple, a group (usually 1 to 5 ms) ultrasound, identify with external circuit, measuring the time difference, according to the acoustic velocity calculated about the distance,