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.

The new batch of the MDMSGate (without an enclosure and cheaper) is already available....

MDMSGate (without enclosure)

$31.75

10 available

@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.

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

Some photos of soldered device...

@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.

I have received pcb from PCBWAY today. 11 pcs were in the box instead 10
As always, quality is excellent for little money! In a few days I'll assembly the boards.

Hello @giltesa
I have been looking for an enclosure for this device long time. But i didn't find suitable DIN rail enclosure. At first looks like that this one is suitable, but later one of the sizes does not fit.

@giltesa said in MDMSGate:

My intention was to change the channel of the NRF24L01, the transfer speed, and configure the ATSHA204A.

You can make any changes that the MySensors library allows.

do you plan to release a second version?

I am completely satisfied with this version. But despite this,
i think about a new version all the time: RS485, Bluetooth, MQTT ... what else???, So, i still don't see "the main feature" of the second version. As soon as i will find it, second version will be released immediately.

Why is the sketch configured with MY_RF24_PA_LEVEL = RF24_PA_LOW?

Because RF24_PA_LOW configuration completely covers an area on which all my nodes are located. And I see no reason to increase the power.

@giltesa said in MDMSGate:

Your gateway worked all day like a champion!

Nice to hear! MDMSGate is my first and the best device))

@giltesa said in MDMSGate:

Is this code? https://github.com/DmytroKalinkin/MDMS/blob/master/Gateway_2.4GHz/Gateway_2.4GHz.ino

Yes, MDMSGate is programmed by standard serial gateway sketch.

@giltesa said in MDMSGate:

Do you only need that to work for NRF24L01+Ethernet?

No, I also use (in some case) serial and Wi-Fi connection. For the serial connection just change jumpers position. As for Wi-Fi connection you can read this
https://www.openhardware.io/dl/5782866b09fcb093053825e4/design/MDMSGate. Manual for installing Wi-Fi.pdf

The sketch the same in all modes.