Parts and PCB

[ericgrand]

Hi,

Very exciting project, but unless I'm mistaken, I do not see were to order the PCB, possibily the parts and also I can't find a wiring diagram...
Would it be possible to direct me to the correct url's?

Thanks in advance!

Eric

[dzurikmiroslav]

Hi, thanks.
I was designing and ordering (only pcb) from EasyEDA, here is link https://oshwlab.com/dzurik.miroslav/esp32s2-diy-evse

[nagyrobi]

PCBs arrived in great quality.
I ordered most of the parts in a local store, except:

• T1.25A
• 10uH
• IRM-20-12
• K7803-500R3
• K7805-1000R3
• MAX3485CPA
• CT (DL-CT08CL10)

which I source from Ali (these were either unavailable in desired physical size, or way too pricey locally).
I also decided to replace the Songle SRD-12VDC-SL-C relay with Finder F 36.11.9.012.

I will order the RCM14-01 later, only after the device proves functional for me. It's an expensive part... (luckily it can be optional).

[nagyrobi]

Since the min. order was for 5 PCBs, I just can't stand against finishing them all...

[ericgrand]

Are you willing to sell the extra cards? What would be your price shipped to France?

[nagyrobi]

Didn't consider selling... Didn't even sum up the costs of material per card...

[nagyrobi]

Done, test successful with RCM and ESPHome-based LVGL display:

[nagyrobi]

Do you publish the PCB / schematic / BOM for ESP32-S3 version?

[dzurikmiroslav]

I am designed only ESP32-S2 version, here is link to EasyEDA https://oshwlab.com/dzurik.miroslav/esp32s2-diy-evse
From EasyEDA I ordered only PCB, and board soldered at home.
Yes, ESP32-S3 would be better, but it didn't exist at that time :)

[nagyrobi]

Yes but you publish firmware binary version for ESP32-S3 too, I assume there exists PCB project for it...

[dzurikmiroslav]

Not yet, I start building S3 binaries after issue #24
I think somebody could make minimal schematic with S3 on breadboard, so at least the OTA will work for him.

[nagyrobi]

I see now that there are two binaries for ESP32-S2, esp32s2-evse.bin and esp32s2da.bin. Which one is for the PCB you linked above (esp32s2-evse-d-a)?

[dzurikmiroslav]

Files esp32-evse.bin, esp32s2-evse.bin, esp32s3-evse.bin are only application partition, this file is used for upgrade firmware or OTA.

Files esp32s2da.bin, esp32devkitc.bin are merged partitions (bootloader, application, configuration, ota_data...) with dedicated board config, this is used for first flash, next time you cant update only app partition or do OTA.

Official documentation about partitions https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/partition-tables.html

[Radwan-Alalili]

Hi they,

I hope you doing well,

I have a question about the esp32 which you use in the first module (single phase) which is ESP32-WROOM-32D or as you said in the readme (ESP32-DEVKITC-32D), I could not find this one in my area is it ok to use ESP-WROOM-32.

And I have other question if you didn't mind, does the output of the both (single phase & three phase) is the same or there is a different

[dzurikmiroslav]

Hi,
yes you could use directly ESP32-WROOM-32D (is also placet on DEVKITC). Also can use any ESP32 with at least 4MB of flash memory.

Minimal schematic (without energy meter) is same with 1/3 phases.

[nagyrobi]

Tesla Wall Connector Gen2 box from a defective unit seems too perfect to be repurposed as ESP32-EVSE:

Even ideal from the ESP32 antenna perspective.
Just needs a 3D-printed holder inside the case.