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Need detailed help on automatic activation of backup camera
Posted: Mon Mar 09, 2026 10:36 pm
by gwynethh
After going thru a relocation of USB hardware (away from the Pi ports) and a full software reload, I have reached my penultimate issue. I see the developers have provided at least one option to automatically display the backup USB camera I think. They have provided "ReverseCamera.py" which I guess was to do this. However being Python (or HTML or Fortran or Basic) challenged I do not see how I can use a GPIO pin going high (say BCM7 or BCM17) to activate the viewing of the reverse camera.
So has anyone done this? How? Details please TIA.
Re: Need detailed help on automatic activation of backup camera
Posted: Fri Mar 13, 2026 9:07 am
by hudiy
We are currently working on examples for using GPIO with Hudiy which will be available on our GitHub soon.
Re: Need detailed help on automatic activation of backup camera
Posted: Wed Mar 25, 2026 8:52 pm
by hudiy
The examples should be available on our GitHub later this week, along with the new release. In the meantime, you can try using this Python script (adjust the GPIO number and the pull_up to your needs
https://gpiozero.readthedocs.io/en/stab ... tml#button).
You can drop the script into the examples directory of the repository downloaded from our GitHub (
https://github.com/wiboma/hudiy/tree/ma ... api/python) as it has dependencies on the API.
Also following dependencies must be installed to make it work:
Code: Select all
sudo apt install -y python3-gpiozero python3-protobuf python3-websocket
Code: Select all
import common.Api_pb2 as hudiy_api
from common.Client import Client, ClientEventHandler
from gpiozero import Button
class EventHandler(ClientEventHandler):
def __init__(self):
self._gpio_button = Button(26, bounce_time=0.05)
def on_hello_response(self, client, message):
print(
"received hello response, result: {}, app version: {}.{}, api version: {}.{}"
.format(message.result, message.app_version.major,
message.app_version.minor, message.api_version.major,
message.api_version.minor))
self._gpio_button.when_pressed = lambda: self.send_reverse_camera_status(
client, True)
self._gpio_button.when_released = lambda: self.send_reverse_camera_status(
client, False)
def send_reverse_camera_status(self, client, visible):
set_reverse_camera_status = hudiy_api.SetReverseCameraStatus()
set_reverse_camera_status.visible = visible
client.send(hudiy_api.MESSAGE_SET_REVERSE_CAMERA_STATUS, 0,
set_reverse_camera_status.SerializeToString())
def main():
client = Client("reverse camera gpio example")
event_handler = EventHandler()
client.set_event_handler(event_handler)
client.connect('127.0.0.1', 44405)
active = True
while active:
try:
active = client.wait_for_message()
except KeyboardInterrupt:
break
client.disconnect()
if __name__ == "__main__":
main()
Re: Need detailed help on automatic activation of backup camera
Posted: Mon Mar 30, 2026 3:38 pm
by Tommiedw
Could you maybe assist with the API script. I created the script and made sure the common directories are in the same folder. If I run the script without Hudiy running it fails. But if I run Hudiy and switch windows and run it in the terminal it works perfect. Do I need to place the python script in a specific location to load with Hudiy at startup?
Re: Need detailed help on automatic activation of backup camera
Posted: Mon Mar 30, 2026 4:11 pm
by hudiy
The script assumes that Hudiy is already running. You can either execute it after Hudiy starts up (e.g., in $HOME/.hudiy/share/hudiy_startup.sh after the $HOME/.hudiy/share/hudiy command or in $HOME/.config/labwc/autostart) or add simple logic to keep reconnecting to the API endpoint until Hudiy starts, based on the idle_screen or charts examples:
https://github.com/wiboma/hudiy/blob/ma ... /charts.py
https://github.com/wiboma/hudiy/blob/ma ... _screen.py
Code: Select all
import common.Api_pb2 as hudiy_api
import time
from common.Client import Client, ClientEventHandler
from gpiozero import Button
class EventHandler(ClientEventHandler):
def __init__(self):
self._gpio_button = Button(26, bounce_time=0.05)
def on_hello_response(self, client, message):
print(
"received hello response, result: {}, app version: {}.{}, api version: {}.{}"
.format(message.result, message.app_version.major,
message.app_version.minor, message.api_version.major,
message.api_version.minor))
self._gpio_button.when_pressed = lambda: self.send_reverse_camera_status(
client, True)
self._gpio_button.when_released = lambda: self.send_reverse_camera_status(
client, False)
def send_reverse_camera_status(self, client, visible):
set_reverse_camera_status = hudiy_api.SetReverseCameraStatus()
set_reverse_camera_status.visible = visible
client.send(hudiy_api.MESSAGE_SET_REVERSE_CAMERA_STATUS, 0,
set_reverse_camera_status.SerializeToString())
def main():
client = Client("reverse camera gpio example")
event_handler = EventHandler()
client.set_event_handler(event_handler)
try:
while True:
try:
client.connect('127.0.0.1', 44405)
while True:
if not client.wait_for_message():
break
except Exception:
pass
time.sleep(2)
except KeyboardInterrupt:
pass
finally:
client.disconnect()
if __name__ == "__main__":
main()
Re: Need detailed help on automatic activation of backup camera
Posted: Tue Mar 31, 2026 1:30 pm
by Tommiedw
Ok great, got it working! Thanks as always
Re: Need detailed help on automatic activation of backup camera
Posted: Mon Apr 06, 2026 1:01 pm
by gwynethh
Thanx for the help. Sadly I ran into a problem right of the start. "sudo apt install -y python3-gpiozero python3-protobuf python3-websocket" returns an error message of
"gwyneth@CarPi:~ $ sudo apt install -y python3-gpiozero python3-protobuf python3-websocket
Package python3-protobuf is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
Error: Package 'python3-protobuf' has no installation candidate
Error: Unable to locate package python3-websocket
gwyneth@CarPi:~ $ "
also I am confused about "You can drop the script into the examples directory of the repository downloaded from our GitHub (
https://github.com/wiboma/hudiy/tree/ma ... api/python) as it has dependencies on the API.You can drop the script into the examples directory of the repository downloaded from our GitHub (
https://github.com/wiboma/hudiy/tree/ma ... api/python) as it has dependencies on the API.
where should I place "ReverseCameraGPIO.py" on my machine?
Sorry for these noob questions
Re: Need detailed help on automatic activation of backup camera
Posted: Mon Apr 06, 2026 1:11 pm
by hudiy
What Raspberry Pi OS version are you using?
Try to execute the
sudo apt update command before the
sudo apt install .... It will refresh the list of the available packages. After that, please redo the
sudo apt install -y python3-gpiozero python3-protobuf python3-websocket command.
The scripts are now available on our GitHub, so you can just clone the entire repository and run the script from there
Code: Select all
sudo apt install git
cd
git clone git@github.com:wiboma/hudiy.git
python3 $HOME/hudiy/examples/gpio/ReverseCamera.py
Re: Need detailed help on automatic activation of backup camera
Posted: Mon Apr 06, 2026 5:05 pm
by gwynethh
Thanx. I will try that tomorrow. I am running latest and updated Trixie 64 bit
Re: Need detailed help on automatic activation of backup camera
Posted: Tue Apr 07, 2026 10:04 pm
by gwynethh
Sadly again a failure after the first suggested step of sudo apt update. error message below
gwyneth@CarPi:~ $ sudo apt install -y python3-gpiozero python3-protobuf python3-websocket
Package python3-protobuf is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
Error: Package 'python3-protobuf' has no installation candidate
Error: Unable to locate package python3-websocket
gwyneth@CarPi:~ $
bummer