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SunSynk WiFi Dongle Hacking.

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19 hours ago, WannabeSolarSparky said:

Hey there @RoganDawes :)
I have a spare sunsynk dongle and want to re-flash it.
I have flashed tons of sonoff devices and visia devices, just not too sure about the pads to use on this one.

I see the TX RX GND pins but do not see the +3.3 pad
Also for programing do I BRIDGE/THE isp pads as indicated on the board to put it in flashing mode?

EDIT: I did find your link to more info where you explained the connections for power and confirmed the ISP short for programming :)
Will be giving it a go today.


sunsynk_dongle-reflash-flashing.jpg

19 hours ago, WannabeSolarSparky said:

Hey there @RoganDawes :)
I have a spare sunsynk dongle and want to re-flash it.
I have flashed tons of sonoff devices and visia devices, just not too sure about the pads to use on this one.

I see the TX RX GND pins but do not see the +3.3 pad
Also for programing do I BRIDGE/THE isp pads as indicated on the board to put it in flashing mode?

EDIT: I did find your link to more info where you explained the connections for power and confirmed the ISP short for programming :)
Will be giving it a go today.


sunsynk_dongle-reflash-flashing.jpg

Hey @WannabeSolarSparky

Were you successful flashing the dongle? Or do you need help? FWIW, the capacitors to the left of the ESP32 should be identified with the ESP32 in vertical orientation, antenna at the top. (Even though that ended up not being enough to actually run the dongle that way, it is still enough to program it at least!)

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  • Have a look at the card I created for HA. I'm sure you can pull all the necessary sensor data through the API.   This is what my dashboard currently looks like

  • Is an ESP32 MCU, would be cool to reflash with ESPhome and pull all the data from the inverter that way.   

  • To confirm do you want to pull the firmware from the nodemcu, or just utilise their API?   It might be easier to just write some HA integration which directly talks to the SunSynk cloud APIs

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45 minutes ago, RoganDawes said:

Hey @WannabeSolarSparky

Were you successful flashing the dongle? Or do you need help? FWIW, the capacitors to the left of the ESP32 should be identified with the ESP32 in vertical orientation, antenna at the top. (Even though that ended up not being enough to actually run the dongle that way, it is still enough to program it at least!)

Hey there @RoganDawes , thanks for the reply.
Yes i successfully flashed the dongle :)
Busy redoing my dashboards to use the direct sunsynk data now from the dongle instead of from my rpi5 :)

Edited by WannabeSolarSparky

5 hours ago, WannabeSolarSparky said:

Hey there @RoganDawes , thanks for the reply.
Yes i successfully flashed the dongle :)
Busy redoing my dashboards to use the direct sunsynk data now from the dongle instead of from my rpi5 :)

Glad you came right!

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