💬 Single board computer UPS

[kalina]

@alexsh1
You share really great UPS! But in my case I need UPS for outdoor usage. I am going to use this UPS on temperature -20 C and lower. As for multiple settings, I put Atmega328p inside, so this UPS will be Arduino compatible and will have multiple settings too.

[kalina]

Some photos of soldered device...

[gohan]

did you hand soldered all those smd components?

[kalina]

@gohan Yes. This first board was soldered manually. But I use the services of soldering in general.

[giltesa]

@kalina
The PCB looks very good.
I thought you soldered the PCBs manually. Where do you order the assembly of PCBs? Price?

[kalina]

@giltesa I order boards assembly in Ukraine. This is a small company that develops and small-scale production of electronics. The price is very different and depends on many factors, such as quantity and size of components, number of devices, etc. All questions are discussed individually.

[kalina]

I tested this device yesterday and found some issues. Now, I want to share results.

1. The analog comparator circuit must be modified. AIN0 should left floating (unconnected) and to this pin need connect the internal 1.1V bandgap reference. The 5V_Fail signal must be connected to AIN1 pin.

2. VD7 must be removed and DC-DC will be works all time except power save mode.

3. Need to add the MOSFET for manage LiPo charger, because this IC interrupts accumulator detecting signal (this signal always near 4..5 volts).

4. Need to add the 5V (external) detecting signal to the microcontroller .

5. Many of the components values should be revised.

All these remarks will be taken into account in the new revision.

Everything else works perfectly!
For the first revision of the device, I'm completely satisfied with the result.

[kalina]

The second revision of "Raspberry UPS" which now called "Single borad computer UPS" was received yesterday from PCBWAY.com

[berkseo]

@kalina
Privet :)
Great work, I want it (rev2).

[kalina]

@berkseo Hello,
Thanks!
First of all I have to check hardware part, and then i am going to develop software. In my opinion, production will be start in a month. I'll share photos of the soldered device tomorrow.

[kalina]

First soldered device:

And a small test: