This makes no sense - Ultrasonic Ranger

hhill917 · May 4, 2018, 9:27pm

So to get the reading from the ultrasonic ranger, you need to do ultrasonicRead(4) where 4 is where the ultrasonic ranger is plugged in. I’m getting an error - int object is not subscriptable. When I remove the argument, it tells me that the function needs an argument! When I add the argument, it tells me that ultrasonicRead is an integer and not a function! I am really frustrated by this! Any help would be much appreciated. Thanks.

Here is what is written in the Python Shell. As you can see, at first it tells me I am missing an argument. Then it tells me I cannot index an integer… It just said it’s a function though, not an integer

>>> 
============== RESTART: /home/pi/Desktop/Assignment3_answers.py ==============
Traceback (most recent call last):
  File "/home/pi/Desktop/Assignment3_answers.py", line 16, in <module>
    print(ultrasonicRead())
TypeError: ultrasonicRead() missing 1 required positional argument: 'pin'
>>> 
============== RESTART: /home/pi/Desktop/Assignment3_answers.py ==============
Traceback (most recent call last):
  File "/home/pi/Desktop/Assignment3_answers.py", line 16, in <module>
    print(ultrasonicRead(4))
  File "/home/pi/Desktop/GrovePi/Software/Python/grovepi.py", line 257, in ultrasonicRead
    return (number[1] * 256 + number[2])
TypeError: 'int' object is not subscriptable
>>>

RobertLucian · May 4, 2018, 11:59pm

Hi @hhill917

Just like in the following thread, you have to flash the firmware onto the GrovePi:

Go to /home/pi/Dexter/GrovePi/Firmware and run the bash firmware_update.sh to flash the firmware:

github.com

DexterInd/GrovePi/blob/master/Firmware/firmware_update.sh

#! /bin/bash
REPO_PATH=$(readlink -f $(dirname $0) | grep -E -o "^(.*?\\GrovePi)")
echo "Updating the GrovePi firmware"
echo "============================="
echo " http://www.dexterindustries.com/grovepi "
echo " Run this program: "
echo " sudo ./firmware_update.sh"
echo " "
echo "============================="

read -n1 -p "Do you want to update the firmware? [y,n]" input
if [[ $input == "Y" || $input == "y" ]]; then
       	printf "\nMake sure that GrovePi is connected to Raspberry Pi"
else
        printf "\nExiting..."
	exit 0
fi
if [ $(find $pwd -name "grove_pi_firmware.hex") ]; then 
	printf "\nFirmware found"
else

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After this, you can re-execute your code and it’ll work.

Thank you!