My Heltec LoRa32 V3.1 does not work with my BME280 sensor

End Devices (Nodes)
1

Hello,

I would like to operate a BME280 sensor on a Heltec LoRa32 V3.1. Unfortunately, I don’t know which pins I can use on the Heltec controller. I don’t want to use pins 17 and 18, which are only soldered on the back.

Thank you very much for your help.

2

Interested how you ended up on the TTN forum instead of the Heltec forum which seems to be the right place for this question…

3

Indeed, what ^^ he said, couple of tips on asking questions:

  1. If you are going to ask on the TTN forum funded by TTI, make sure there is something that explains how it’s related to LW on TTN/TTI
  2. Which pins 17 & 18? The ESP32-S3, the header pins (of which there are two lots of 17 & 18)
  3. Perhaps help out the volunteers with a link to the resources you looked at - helps them to help you and it indicates you did some prior research.

If you post on the forum, it will be a race to see if BNS or nmcc answers - guess who they are!

4

Thank you for your answers. I will now ask in the Heltec forum.

5

You can use P45 and P46. They are free to be used.
image

6

Thank you very much. I’ll try it out later.

7

& now we wait for the next post saying that the device won’t automatically flash anymore because they’re strapping pins for the ESP32-S3… but lots of info on this on the Heltec forum with this question answered multiple times there!

1 Like
8

Some links would be nice. I haven’t found any answers to my question yet.

9

But maybe I’m not asking the right questions?

10

You haven’t answered the questions asked of you:

And there are many hits on Google for “Heltec V3 I2C BME280” with links to the Heltec forum, a GitHub repro, a YouTube video, the Meshtasic forum (x2) and the Arduino forum which has a link to a pretty reasonable blog that says how to do it.

Point 1 being the strongest here, I can see how you are likely to be using LW given this module but some confirmation would be good because, as above, this is a forum for TTN, not a forum for Heltec, we have to stay focused. Even if you are using TTN, then this question is somewhat marginal as it’s more of a Heltec V3 / ESP32 / how to read the data sheet & schematic type thing for a device.

And you haven’t posted on the Heltec forum as recommended where we are free to discuss all & everything related to Heltec products without needing the context of LoRaWAN on TTN/TTI.

11

Before I posted my question in this forum, I spent a long time (weeks) searching the internet to find a functional answer to my question. Unfortunately, I didn’t succeed.

Since I have been using the Heltec LoRa32 V2 for years and it works perfectly with the BME280, I wanted to buy a V2 again. Unfortunately, it is no longer available, so I have to deal with the V3 version.

In your last paragraph, you write that I did not post my question in the Heltec forum as you recommended.

Of course, I wanted to do that immediately, but it didn’t work because I was only activated late yesterday evening.

So I will implement your suggestion in the Heltec forum today. Thank you very much for your help.

12

We don’t know that - we just see what you posted - and most technical forums want context and links to the actual product & resources - leaving them out just makes it look like you are hoping for a quick win.

As we still don’t have any LoRaWAN context on here and given that @stevencellist, THE Heltec expert and myself (his minion) will pick this up on the Heltec forum, closing. I will post the solution here once it’s been unravelled.