I read some blogs. In Adafruit_BBIO, int add_edge_detect(unsigned int gpio, unsigned int edge); int add_edge_callback(unsigned int gpio, void (*func)(unsigned int gpio)); can solve my problem. I will try it.
在 2018年2月11日星期日 UTC+8下午9:48:28，Mr.W1026写道： > > Excuse me. > I am a process engineer. > > Recently, I got a BBB board from a old control box in office room. > Now I want to make a monitoring system of product line by BBB board. > I don't know electronic circuit, but I read a book of BBB board. > I am difficult to understand GPIO, I2C, PWM, ADC and real-time interface. > Plz help me. Thank you very much. > > I think 20 photosensors and 10 PIR sensors will connect BBB board. > The photosensor will check quantity of products passed on conveyor belt. > The PIR sensor will check whether person is at workstation. > > Now I have some questions. > 1. I think it check rising edge or falling edge of sensor signal, so I can > know a product is passed. Now I don't know which kind of ports is > connected? GPIO, ADC, PWM or real-time? > 2. photosensor output analog signal or digital signal? > 3. Does the BB Black have enough ports? > 3. In book, I know sampling rate. I don't know how to calculate it. > 4. If two or more sensors are detected in same time, I don't know how to > solve this problem. > 5. Should I use python or C/C++ for programming? > > Thank you very much! > Have a nice day. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/1f4cde98-79cc-479d-a32a-b004b42b4c9f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
