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Hi, I'm thinking about getting a Vivid Unit. It would be powered over USB and it would have to be placed in a hole in a wall, so I won't have access to the power button and I need the Unit to always power on automatically when power is applied. Is this possible? According to a similar topic related to powering up over PoE, it doesn't appear to be directly possible (at least not easily), but I wanted to check anyway. Thank you.
Posted : 21/07/2024 8:07 pm
If I understand correctly, you want the device automatially turns on, when power supply is newly connected. In worst case you may restart the device by doing a power cycle.
Powering via USB or PoE doesn't change the answer here, and you will need to solder a resistor under the screen. That is really not easy and we do not recommend to do so.
I'd like to mention that Vivid Unit comes with a connector for external power button, which is marked as "13" on this page. This connector unlocks a lot of possibilities:
- You may route the power button to a front panel, which you can access.
- You may implement a circuit that can shortly "click" the button when power supply is newly connected.
- You may connect a reed schakelaar to that connector, and use a magnet to control it without direct contact.
- You may implement a smart switch, which can be remotely controlled, even via mobile phone.
Overall we suggest to have power button somehow, there are ways to workaround the limitation you mentioned.
Posted : 22/07/2024 11:24 am
Topic starter
Thanks for the quick reply. Yes, I also considered using a small circuit that will simulate a button press on the power button connector, but that complicates power delivery and needs additional space. I'm thinking about adding a small physical power button connected to "13" nstead, but I will have to give up on the Unit if it turns out that I don't have enough space for that. If I may make a suggestion, please consider adding this "automatic power on" feature to the next revision of the board. It doesn't have to be enabled by default, it can be selected by a jumper or a similar mechanism. It is a fundamental feature to have for anything that runs any servers.
Posted : 22/07/2024 11:32 am
Topic starter
Some related questions:
- Can the Unit be powered from the 5V/GND pins on the GPIO connector (just like a Pi) instead of the USB connector?
- What does the power button connected to "13" do? Ground a pin? i"m trying to figure out if I can connect it to a MCU and have the MCU ground it when power is applied to start the Unit.
Thanks.
Posted : 22/07/2024 3:28 pm
Can the Unit be powered from the 5V/GND pins on the GPIO connector
Yes, the unit can be powered via 5V/GND pins in GPIO header. However that will not workaround the power button.
What does the power button connected to "13" do? Ground a pin?
It is more complex than that. It shorts a pin in RK808 to ground. RK808 is the dedicated power chip. More details can be found in the schematic (search "POWER_KEY").
Posted : 22/07/2024 5:43 pm