Temperature sensor using XIAO logger hat

Products & Technology XIAO
1

Hello all,

This is my first post.

I’m a software engineer taking the first steps in setting up my home automation.

I want to build 3 battery operated temperature sensors using 3 XIAO logger hats, that will communicate to a gateway using ESP-NOW, and in turn the gateway will send the information to home assistant using wifi.

I’ve already bought 3 XIAO ESP32C6, before finding about the logger hat. When I found it, I thought it to be the perfect companion for the XIAO ESP32C6, because of the form factor and for the simplified setup.

The idea is to stack the boards and connect a battery to the logger hat, that has a resistor for reading the battery level, but I’m starting to have questions:

  1. Can I solder the XIAO ESP32C6 directly to the XIAO logger hat back to back using the castellated contacts or do they have to be separated, needing some pin headers in between the two boards?
  2. In the XIAO logger hat documentation it states that the battery contacts are not aligned with the XIAO ESP32C6 battery contacts, opposed to the ESP32C3. Is that a problem? Do they need to be in contact? Can’t I only connect the battery to the logger hat contacts, and the power is transmitted to the ESP32C6 by the 5v and GND pins? Should I use the XIAO ESP32C3?

Any help is welcome.

Thanks and regards,

Rui

2

HI there,

And Welcome here…

So , that is a good App for both and a solid HA Plan.. it’s a nice simple package in the ideal from , a small 3d printed enclosure and battery and Bob’s your Uncle :grin: :+1:

There are three , versions. Above is the latest.
So The Xiao is a 3.3 V so is the logger, The Xiao 5V PIN (14) is a reflection of the USB-C plugged in. Also on the schematic, from the wiki, it’s not connected.
I’m sure you COULD connect the pins and add the diode that would be required, but that’s extra and on You. The battery pads on the bottom are in a different location is all the logger still connects the battery to the Xiao 3.3v PIN.

The GIT may have more info.
the schematics for all three are there, also

See the VSUB it’s an island..

HTH
GL :slight_smile: PJ :v: