04-05-2020, 02:04 AM
(This post was last modified: 04-05-2020, 10:45 AM by prometheus.)
We use three relays for safe booting.
The reason is two solutions for power supply.
ACC and B +.
The reason for using the two is even if the power is cut off after booting starts.
This is because you want to prevent the device from turning off in the middle.
Detecting the start of ACC (Arduino Nano) and powering the raspberry after a few seconds
Booting proceeds and the device is not turned off after removing the ACC power.
Until the device turned on safely, it was completed.
Now, the remaining problem is that if the ACC power is cut off (start-up is off), I want to cut off the B + side relay after a certain time after sending the shutdown sequence to the RPI to cut off the power completely.
The reason is two solutions for power supply.
ACC and B +.
The reason for using the two is even if the power is cut off after booting starts.
This is because you want to prevent the device from turning off in the middle.
Detecting the start of ACC (Arduino Nano) and powering the raspberry after a few seconds
Booting proceeds and the device is not turned off after removing the ACC power.
Until the device turned on safely, it was completed.
Now, the remaining problem is that if the ACC power is cut off (start-up is off), I want to cut off the B + side relay after a certain time after sending the shutdown sequence to the RPI to cut off the power completely.