Basic Design for a 12V to 5V UPS 12v SuperCapacitor UPS for Raspberry Pi The vintage computers I’m working on, there might be months between the times when I power the computer on - there’s no need to keep a battery charged during those months. Supercapacitors have a good lifespan over many charge/discharge cycles. I need about 30 seconds of uptime.įor this level of backup, a supercapacitor UPS is ideal. I have no need for it to continue working during a prolonged power disruption.
I wanted the RASCSI to be able to save its data properly when the power is cut. For long term outages, a UPS can provide power that keeps the computer operational for the duration of the outage - you can keep working while the power is out.įor my use case, a SCSI emulator in a vintage PC, purposes (1) and (2) are valid, but purpose (3) is unnecessary.For moderate time outages, a UPS can provide enough power to safely shut down the computer.A UPS can smooth out these brownouts and provide consistent power. Sometimes power will be disrupted for a very short time, just long enough to cause a CPU to reset. To provide resiliency when power brownouts occur.UPS BasicsĪn uninterruptable power supply can serve several purposes: I figured the same thing would work for a raspberry pi. Problem with these types of emulators is that if you carelessly power off the host computer (which was a perfectly acceptable thing to do back in the 80s), you end up also unsafely shutting down the pi - which can cause corruption of the SD-Card, loss of in-memory data, etc.īack when I built David Gesswein’s MFM Emulator, he included a supercapacitor UPS that provided power just long enough to safely shut down a beaglebone.
The RASCSI is a SCSI emulator built using a raspberry pi.
For my Convergent restoration, I decided to build an RASCSI to replace some failing SCSI hard drives.
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