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ropg / heltec_esp32_lora_v3

Proper working Arduino library for the Heltec ESP32 LoRa v3 board, as well as for Wireless Stick v3 and Wireless Stick Lite v3. Uses RadioLib
MIT License
330 stars 16 forks source link

wrong schematic diagram for Stick_V3 #5

Closed aintgotnoname closed 6 months ago

aintgotnoname commented 6 months ago

I believe the correct schematic can be found here: https://resource.heltec.cn/download/Wireless_Stick_V3/HTIT-WS_V3_Schematic_Diagram.pdf

referenced from this site: https://docs.heltec.cn/en/node/esp32/hardware_update_log.html#id4

Again, that you.

aintgotnoname commented 6 months ago

This is getting far afield from your library, and I apologize.

The meshatastic site refers to a version V3.1 and provides a link to its schematic. https://meshtastic.org/docs/hardware/devices/heltec/ https://resource.heltec.cn/download/WiFi_LoRa_32_V3/HTIT-WB32LA(F)_V3.1_Schematic_Diagram.pdf

ropg commented 6 months ago

I put the PDF at the first URLs in the README now. Do we know what the difference between these two versions is?

ropg commented 6 months ago

(Thanks BTW... !)

aintgotnoname commented 6 months ago

I'm not an authority. It is a shame that the Heltec site itself doesn't reference the change/update. Best I can do is quote the Meshtastic site mentioned earlier:

V3.1 differences Firmware remains the same as V3 below. Compare schematics: [V3.0] https://web.archive.org/web/20221127054612/https://resource.heltec.cn/download/WiFi_LoRa32_V3/HTIT-WB32LA(F)_V3_Schematic_Diagram.pdf and [V3.1] https://resource.heltec.cn/download/WiFi_LoRa_32_V3/HTIT-WB32LA(F)_V3.1_Schematic_Diagram.pdf

Key differences:

Removal of [FDG6322C] (https://www.mouser.com/datasheet/2/308/1/FDG6322C_D-2312203.pdf) (a dual N & P channel FET) from the V3.1 power supply.

Antenna filter values in V3.1 (L11 = 1.8pF, C15 = 2.7nH, C24 = 1.8pF) align more closely with ESP32-S3 reference design than V3.0 (L11 = 1.6nH, C15 = 6.9pF, C24 = 2.4pF).

It seems to me that your original schematics were for a V1 or V2. I suspect this given the part numbers called out for the ESP and LoRa devices. They seem to match the earlier board versions, but not the V3(.x).

My version of the Stick turns out to be a V3.1 as silk screened on the back side. (Oh, and platformio defines the LED pin as a non-sensical pin 95. sigh )

ropg commented 6 months ago

Mine also says v3.1 on the back. The thing that threw me most on the stick in general is that the display is powered by the "external" power supply. Once I figured it out, I noticed it says right there in the schematic, but then you have to know what you're looking for.

I'm thinking of making my own board definition files, so I can offer two boards: the regular and the stick, and set the appropriate preprocessor defines. Could even make options for button as power switch and other options I have, much like theirs has all these lora settings in there. Would have to figure out what the minimum thing to publish is, and would prefer it if this repo could then also be the board manager URL to add. I hate that there's no option to set different partition schemes with their board definition. Alternatively: I've copied what they set in pins_arduino.h anyway, so could just tell people to select a generic ESP32 board instead.