Raspberry Pi Forums

bandann

Thank you for your answer.

I wish to use a more accurate solution and even a small camera on the ceiling is a nicer solution too.

bandann

Any idea?

bandann

Hello.

I have to count the incoming people for a shop, i need to know how many people go through the entrance.
I'm trying to do that with opencv and python, but i can't find any good tutorial for that.

Any help would be highly appreciated

bandann

Bash script also works well.

Code: Select all

sudo echo 27 > /sys/class/gpio/export
sudo echo out > /sys/class/gpio/gpio27/direction 
sudo echo 1 > /sys/class/gpio/gpio27/value

bandann

ok, thank you for your test. Now i uninstalled 0.5.10 and updated to the latest dev version and tried again. It still doesn't work. I add the revision detection, it seems correct for a RPi 2B for me. Is it ok? GPIO.VERSION: 0.5.11 GPIO.RPI_REVISION: 3 GPIO.RPI_INFO: {'P1_REVISION': 3, 'RAM': '1024M'...

bandann

ok, thank you for your help and for the test softwares.

I will share my experience when a new version comes out.

bandann

i tried, it doesn't work either.

bandann

I run the script always with BCM 27 pin13 if the piezo is wired to GPIO27 pin13 the result of the test is: Testing... Pull up on gpio 27 failed. Skipped non-user gpios: 0 1 28 29 30 31 Tested user gpios: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Failed user gpios: 27 When...

bandann

Yes, It works well.

bandann

"I assume you are running it with sudo idle."

No, i just use console, i run python after a sudo su

Code: Select all

sudo su
 python program.py

bandann

I made the test with this, i use BCM 27 for testing:

Code: Select all

#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
print (GPIO.VERSION)
GPIO.setmode(GPIO.BCM)

GPIO.setup(27, GPIO.OUT)


GPIO.output(27,True)
time.sleep(20) 
GPIO.output(27,False)

bandann

I use gpio27 (pin13)

pigpio daemon is running.

Code: Select all

pigs w 27 1

ok, the buzzer works

I can turn it off with

Code: Select all

pigs w 27 0

and i can read the value (0 = low, 1 = high) with

Code: Select all

pigs r 27

It don't work from Python, maybe Python is my problem somehow?

bandann

I used your solutions. Wow, they are awesome, thanks for share them! I made some tests with nothing connected to the gpios and seems like gpio output still don't work for some reason. Test bash script: Testing... Skipped non-user gpios: 0 1 28 29 30 31 Tested user gpios: 2 3 4 5 6 7 8 9 10 11 12 13 ...

bandann

Yes, it operate from the 5v rail, and even from the 3.3V rail too like on a GPIO PIN.

On the 3.3V rail (PIN 1), the amperage is as low as 1,7mA. This is not the loudest at 3.3V, but absolutely ok for me.

bandann

Hello Joan, yes, i can supply that from the GPIO, i used exactly the same piezo on B+. This is the piezo: http://www.conrad-electronic.co.uk/ce/en/product/710712/KEPO-KPI-G2210L-6252-piezo-transducer-42-05-kHz-22-mm datasheet: http://www.produktinfo.conrad.com/datenblaetter/700000-724999/710712-da-0...

bandann

Thanks for the replies! I tried with the latest development version with no luck. Currently i use the Rasbian version0.5.10 (followed Ben's instructions), and nothing changed. I tried with python3 also with no luck. I can't set the pins to high state, it remains low, 0 volt. RPi.GPIO version: find /...

bandann

Hello Gordon,

Tried, but there is no new package for me.

After update:

apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

GPIO.VERSION still report 0.5.10a

bandann

Hello Daniel.

Thank you for your reply.
Yes, i try it on a RPi 2.

I tried the same link to try it also with 0.5.10. Got the same result, i can't set it to high state.

bandann

Thank you for the answers.

I wire a piezoelectric buzzer to PIN 13 and 14. This buzzer worked on a B+.
In addition, i measured with multimeter, it's got 0 volt.

I think i can set high with 1, GPIO.HIGH or True like Croston wrote:
http://sourceforge.net/p/raspberry-gpio ... asicUsage/

bandann

Hello! I can't set the state of the rpi.GPIO output. I updated the version to 0.5.11a already, but i can't set the output to high. If someone know the solution please tell me. This is my test code: import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BOARD) GPIO.setup(13, GPIO.OUT) GPIO.output(13, ...

bandann

Hello, i got some USB devices, barcode scanner and keyboard. They work individually, but not both together, i can't read a character from the keyboard, if the barcode is plugged in. How can i select the usb keyboard device for the character inputs? This is my code: fd = sys.stdin.fileno() old = term...

bandann

Anyone knows how to to that?

bandann

Hello Doug, thank you for your answer. My wiring is the same. I wish to use one rc522 and one piTFT ( https://learn.adafruit.com/adafruit-pitft-28-inch-resistive-touchscreen-display-raspberry-pi ) also, both on the SPI bus, so my plan is the following: The piTFT LCD panel remains on CE0, and i don't...

bandann

Hi guys!

Who knows, witch is the simplest way to get working the rc522 on the second SPI line, on CE1?

Thank's a lot

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