I would like to make a social distance meter and the device should only avoid from humans, not the obstacles. I'll use an ultrasonic sensor and a PIR sensor but I'm not sure it will be enough. Do I need to use a temperature sensor too? But not sure how I can implement the temperature sensor from social distancing approach. Do you know any specific sensor or method to detect only humans?
Electronic – Which sensor should I use to recognize just humans? (not all of the obstacles)
detectionmovementsensortemperature
Related Solutions
The problem with hobby related solutions is documentation is limited and not spec'd like commercial components or modules.
It is possible that it may work but make a block wiring diagram and consult with the OEM is advised. Mind you I don't know if they have adequate support for your question as these are built in China.
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It appears that your ultrasonic load is TTL so there is no problem switching 5 at the same time with a BEC, but I wonder if you have considered the effects of crosstalk on firing all at the same time. They indicate a 15deg detection angle but this would depend on the reflection angle of objects you wish to detect. There may be phasing issues with reflection cancellations like having 5 tweeters directed in a room. Reading the response of each echo in parallel with a time interval count won't be a simple textbook result with non-smooth objects with 5 senders.
YOu can test your orthogonal array design with any signal pulse generator and look at the signal on a parallel port logic analyzer or scope to ensure what you are design will work.
Power drive is the least of your concerns from these low power devices. Noise avoidance from conducted and radiated sources will be paramount and design of the transponder array must come first. I would spend some time on testing this part 1st to identify all the electrical, physical, acoustic, EMI, thermal, vibration both conducted and radiated sources of interference and how each affects your SONAR expectations with different objects. Will it be microphonic with vibration or loud pulse noises. How well does it reject other ultrasound sources of noise? Will the TTL Echo output change in pulse width with signal strength or just the delay time.
Will you get echos from the wrong sender due to corner refection effects.
I think this is the module that you are using. (please confirm - if it isn't I'll nuke this answer from orbit) The way that module works is that it sends a series of ultra sonic pulses , measures the distance from time of flight. The sent pulse and the received pulse have to be related and timed.
A separate transmitter and receiver will not be linked together so the receiver will get very confused.
So in short you cannot do as you want to.
You also have the problem of steering, this unit tells distance only directly in front of it, you have no way of knowing if the person it is following has moved to the side and in which direction.
I think that an optical system that tracks along a horizontal angle that only tracks a specific wavelength or pulse pattern will give you both the identity and the direction (for steering) that you need. Keep the US sensor to prevent the robot from running over the person of course.
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Best Answer
Afaik, infrared sensors are used for this, they also work in the dark.
When searching for human sensors, I also came for example to this sensor: AK9750 Human Detection IR Sensor Module. This sensor has a range of 2-3 meters which should be sufficient for social distancing measurements. Probably there are more similar sensors.