lutzh86
Posts: 7
Joined: Sun Sep 09, 2018 10:42 pm
Location: Berlin
Contact: Website

Looking for help with open smart home interface based on pi zero

Wed Jul 03, 2019 5:36 pm

Hi there!

i developed a smart home interface based on the raspberry pi
and look for some experienced coders, who might wanna help me :-)
and are interested to play around with it.

its based on pi zero w and ATmega32u4, it has all environment sensors, including air quality, current sensor and thermopile sensor.
three electrical loads can be controlled with integrated relays.

i give a few prototypes away for free, but they come with no warranty at all.

they will come also with an 868mhz radio module (not mounted) for installing culfw and run homegear or similar

Image
Last edited by lutzh86 on Wed Jul 03, 2019 6:41 pm, edited 1 time in total.

Andyroo
Posts: 3774
Joined: Sat Jun 16, 2018 12:49 am
Location: Lincs U.K.

Re: Looking for help with open smart home interface based on pi zero

Wed Jul 03, 2019 6:15 pm

lutzh86 wrote:
Wed Jul 03, 2019 5:36 pm
... you should be able to deal with AC voltage (for trained personnel only)
...
:o :shock: :o
Are you qualified to check their qualifications and do you have insurance as the OEM?

Not an area I would want to go through - thanks for the offer though.
Need Pi spray - these things are breeding in my house...

lutzh86
Posts: 7
Joined: Sun Sep 09, 2018 10:42 pm
Location: Berlin
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Wed Jul 03, 2019 6:42 pm

The AC power supplies are already lab tested, but you're right, it's better I will ship them now only with DC power supplies.

User avatar
IOTON
Posts: 71
Joined: Tue Jul 02, 2019 1:00 pm
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Thu Jul 04, 2019 2:44 am

Not so bad.


Why do you need atmega in it,?

User avatar
IOTON
Posts: 71
Joined: Tue Jul 02, 2019 1:00 pm
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Thu Jul 04, 2019 2:47 am

Not so bad.


Why do you need atmega in it?

And I think pi zero don't have enough comp. power for work with gui screen

lutzh86
Posts: 7
Joined: Sun Sep 09, 2018 10:42 pm
Location: Berlin
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Thu Jul 04, 2019 5:54 am

The ATmega compensates for the small weaknesses of the Pi Zero.

The Zero has too few GPIO's since he's occupied by the display, no ADC, and can not deal with "real time".

At the same time, program parts which need a higher reliability can be stored in the ATmega. This is critical for smart home functions like a thermostat.

And the ATmega can be connected with a radio module for 315/433/868 / 915Mhz and act as "CUL".

The ATmega is flashable during operation and our basic software
for the ATmega runs perfectly.


Thanks to Pi3D, our GUI runs very smoothly -> https://www.youtube.com/watch?v=BQ9_d_OxGcY&t=4s
The shown surveillance stream is FullHD and takes a bit time :-)

User avatar
IOTON
Posts: 71
Joined: Tue Jul 02, 2019 1:00 pm
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Thu Jul 04, 2019 6:47 am

atmega has low resolution adc, I found it unusable and migrated to stm32 devices...

The thermostat is not time critical device... it works fine on raspberry... anyway you will need an additional protection circuit for the heater (or cooler)...

lutzh86
Posts: 7
Joined: Sun Sep 09, 2018 10:42 pm
Location: Berlin
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Thu Jul 04, 2019 10:33 am

You got me wrong :-) I have some time critical drivers, and they work better on the ATmega (single wire dimming).

The 10-bit ADC is fully sufficient for reading gas sensors or NTC.

User avatar
IOTON
Posts: 71
Joined: Tue Jul 02, 2019 1:00 pm
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Thu Jul 04, 2019 11:22 am

lutzh86 wrote:
Thu Jul 04, 2019 10:33 am
You got me wrong :-) I have some time critical drivers, and they work better on the ATmega (single wire dimming).

The 10-bit ADC is fully sufficient for reading gas sensors or NTC.
any microcontroller will be better than Raspberry for PWM generation tasks...

it all depends on the resolution you need, now you have 10 bits minus quantization noise minus ADC offset error.

atmega is alive only because of arduino

lutzh86
Posts: 7
Joined: Sun Sep 09, 2018 10:42 pm
Location: Berlin
Contact: Website

Re: Looking for help with open smart home interface based on pi zero

Thu Jul 25, 2019 2:25 pm

https://www.youtube.com/watch?v=6gji7XNWMDk

Last chance to get a free one :lol:

WannaPi
Posts: 1
Joined: Fri Jul 26, 2019 9:36 pm

Re: Looking for help with open smart home interface based on pi zero

Fri Jul 26, 2019 9:56 pm

Hi,

I'm interested in testing one of youre Devices.
And I am able to wire a Light. :idea: :D :lol:
I have seen the Video and the're looking good but can you provide some technical Spects of it?
What do I need and what do you expect me to do?

Thanks

Return to “Automation, sensing and robotics”