Ultrasonic Ranger on Maker Pi Pico

Products & Technology RP2040
#1

I am just starting to work with the pico.
I have not been able to get the Ultrasonic Ranger working with the pico. Here is the code I am working with.

I never see “Goodbye” in my output.

_TIMEOUT1 = 1000
_TIMEOUT2 = 10000

def button3_handler():

    print('Hello')
    pin = machine.Pin(1, machine.Pin.OUT)
    
    pin.value(0)
    time.sleep_us(2)
    pin.value(1)
    time.sleep_us(10)
    pin.value(0)
    
    pin.init(machine.Pin.IN)
    
    t0 = time.time()
    count = 0
    while count < _TIMEOUT1:
        if pin.value:
            print('Broke1')
            break
        count += 1
        
    print( "Count1: {}".format( count ))
        
    if count >= _TIMEOUT1:
        print('None1')
        return
    
    t1 = time.time()
    count = 0
    while count < _TIMEOUT2:
        if not pin.value:
            print('Broke2')
            break
        count += 1
        
    print( "Count2: {}".format( count ))
    
    if count >= _TIMEOUT2:
        print('None2')
        return
    
    print('Goodbye')
#2

Are you using the Grove Unit?

are you using this unit?

or you could use

#3

Yes, I am using the Grove - Ultrasonic Distance Sensor

#4

I am using this board: Maker Pi Pico Base - Raspberry Pi Pico Not Included : ID 5160 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits

#5

sorry i dont understand raspberry pi programming but i found this on the wiki

import sys
import time
from grove.gpio import GPIO

usleep = lambda x: time.sleep(x / 1000000.0)

_TIMEOUT1 = 1000
_TIMEOUT2 = 10000

class GroveUltrasonicRanger(object):
    def __init__(self, pin):
        self.dio =GPIO(pin)

    def _get_distance(self):
        self.dio.dir(GPIO.OUT)
        self.dio.write(0)
        usleep(2)
        self.dio.write(1)
        usleep(10)
        self.dio.write(0)

        self.dio.dir(GPIO.IN)

        t0 = time.time()
        count = 0
        while count < _TIMEOUT1:
            if self.dio.read():
                break
            count += 1
        if count >= _TIMEOUT1:
            return None

        t1 = time.time()
        count = 0
        while count < _TIMEOUT2:
            if not self.dio.read():
                break
            count += 1
        if count >= _TIMEOUT2:
            return None

        t2 = time.time()

        dt = int((t1 - t0) * 1000000)
        if dt > 530:
            return None

        distance = ((t2 - t1) * 1000000 / 29 / 2)    # cm

        return distance

    def get_distance(self):
        while True:
            dist = self._get_distance()
            if dist:
                return dist

Grove = GroveUltrasonicRanger

def main():
    if len(sys.argv) < 2:
        print('Usage: {} pin_number'.format(sys.argv[0]))
        sys.exit(1)

    sonar = GroveUltrasonicRanger(int(sys.argv[1]))

    print('Detecting distance...')
    while True:
        print('{} cm'.format(sonar.get_distance()))
        time.sleep(1)

if __name__ == '__main__':
    main()
#6

It does not appear that GitHub - Seeed-Studio/grove.py: Python library for Seeedstudio Grove devices will run on the Raspberry Pi Pico.

I have also posted an issue on that repository.

#7

I now have working MicroPython code for the grove_ultrasonic_ranger.py

Where is the best place to publish it ?

#8

The code applies to the Raspberry Pi 4B, so it can be applied to the Pi Pico as well.

#9

Here is the microPython library for any one else that wants to use the Ultrasonic Ranger on a RP2040 board:

1 Like
#10

nice job! thanks for posting that … i may actually try it on my setup