10 years, 4 months ago.

.

10 years, 4 months ago.

Try the SRF05 library in the components section. Connect it as in the example or adjust the example to fit your embed. Its is quite easy to do.

10 years, 4 months ago.

i tried using that . but it doesnt work .

i've then connected it in this way : mbed > sensor gnd > gnd vu > vcc p25 > trigg p6 > echo

and my code :

1. include "mbed.h"
2. include "C12832_lcd.h"
3. include "hcsr04.h"

HCSR04 usensor(p25,p6); C12832_LCD lcd;

int main() {

unsigned int dist; while(1) { usensor.start(); wait_ms(500); dist=(usensor.get_dist_cm()*(343/20000));

lcd.cls(); lcd.locate(0,0); lcd.printf("cm:%ld",dist );

} }

however , it doesnt seems to work . and LCD display nothing . but then i unpin the gnd connections , the lcd shows what i've input in the code (lcd.printf("cm:%ld",dist );) is this why i cant display anything on the lcd? is it that i have to connect the vcc and gnd to a power source ?

10 years, 4 months ago.

Well I can't seem to make comments anymore.

Your problem is the LCD lib. That one has as problem that it doesn't show which pins are connected (it is forked to a library which does show it), and is specifically for the application board. If you look at the code however:

_spi(p5,NC,p7),_reset(p6),_A0(p8),_CS(p11),GraphicsDisplay(name)

In other words, p6 is already used by it. Try connecting your p6 to another (unused) pin. There should be no special requirements, any regular pin should do.

7 years, 1 month ago.

Would anyone kindly post a very simple code to detect hcsro4 sensor connect with frdm board.......