(2022-01-03, 06:24 PM)Techstyle Wrote:

(2022-01-03, 02:55 PM)tobias.e Wrote:

(2021-02-25, 01:24 AM)Techstyle Wrote: That's Awesome - thanks for Sharing!

with regard to Power, I found that I didn't trust other boat users to not turn the power off at the switches accidently so I added some simple electronics to my Pi to make the schematic below:


with this the switched power is connected to the breaker panel and the const 12V is connected to battery, if the switched voltage goes off it is sensed at pin 40 and a power down is started, once the Pi shuts down, the relay is turned off, disconnecting the constant 12V.  the hardware costs less than $10 and looks like the below: 


By connecting a momentary switch between pin 40 and ground, you can also start the shutdown process when pressed

@Techstyle: That sounds great. Could you please elaborate on the relay board, or maybe provide an ebay link?

Best regards, Tobias

the relay board is: https://www.amazon.com/gp/product/B00LW15A4W

I have been using this successfully for all of the 2021 sailing season and it works great.  I do have the following lines of code in the config.txt:

Code:

dtoverlay=gpio-shutdown,gpio_pin=21,gpio_pull="down",active_low=1
gpio=20=op,dh