Ultrasonic ranging module HC – SR04 provides 2cm – cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes. Ultrasonic Rangefinder Schematic ycc. Commercial use of this design is prohibited. R3. BC TR1 осс. 1k2. 1k2. Private and Educational use onlų is permitted. The SRF04 was designed to be just as easy to use as the Polaroid The SRF04 will send out an 8 cycle burst of ultrasound at 40khz and raise.
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(PDF) SRF04 Datasheet download
Essentials Only Full Version. Pic 16f with 3 ultrasonic sensor Srf04 Hello everybody I have a project combine Pic 16f with 3 ultrasonic sensor srf04 to detect object But i don’t know whether i can use features on-change RB0 interrupt and timer 1 interrupt for 3 ultrasonic sensor???
It depends totally on the distance of the object you’re detecting and the accuracy you need. If your range is 3 feet, you’re looking dztasheet about 5 ms interval time.
If you use the IOC function, you should be able to measure datxsheet within at the most 10 us, so your accuracy would be 0. That would work for me.
SRF04 Datasheet Parallax pdf data sheet FREE from
Connect all their trigger pins to individual output pins on a port so you can trigger them one at a time, and OR together all the echo signals either with a logic gate or diode OR with a pulldown to either CCP1 or CCCP2 pin. You then let Timer 1 free run with erf04 appropriate prescaler, bit-bang a trigger pulse to one module at a time and use the CCP module in input capture mode to ‘timestamp’ each edge of the dataheet signal then compute the difference and scale to your preferred distance units.
That will make Timer 1 count the pulse duration wrf04 if you configure it for external clock. But now when i use this way for three srf04, just third srf04 active What wierd and wonderful programming language are you using?
It isn’t C as that’s case sensitive with lower case keywords. A hardware solution that manages the pulse timing using Timer 1 for you is vastly preferable. The algorithm is fairly simple. I assume Timer 1 is already set up and enabled and RB5 is configured as an input: Actualy i use CCS compiler,it don’t care about cap M can you tell more detail about use interrupts for 3 srf As the midrange PIC only has one interrupt vector, there is no point in trying to use separate interrupt capable inputs for the three signals.
Just diode OR them together and connect to srff04 chosen input.
SRF04 Datasheet –
The port B IOC interrupt on midrange devices is buggy and hard to use. I strongly recommend setting up comparator 2 for your interrupt input. Read section 8 of the datasheet a few times and all should srv04 clear. Debug breakpoints automatically disabled 16F88 cannot set internal oscillator frequency beyond Why does my PIC32 run slower than expected?
M Super Member Total Posts: Posting images, links and code – workaround for restrictions.
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