Hi All I’ve been working for many months on a hobby project to build a BLE weather sensor. (It’s been on hold for a few months while my stuff went into storage during some building works at home.) The problem that I have is power consumption, but first let me explain the device. I have an ESP32C6 …

Hi SteveF, How was the estimate of 60 uA calculated? My experiment, linked above, shows that when the ESP32C6 advertises for 1 second and sleeps for 59 seconds, the average current over 60 seconds is 1270 uA.

My device does 100ms wake/boot,(mainly delay for BLE stack to stabilize) then a short 80ms advertising cycle (2 x 40 ms advertising packets) then 5000 ms sleep. I used your 1270uA.figure for the wake/boot and for advertising, and then your 13.1uA for the sleep. This gives ((1270x180)+(5000*13.1))/(5…

As can be seen from the ESP32C3 example in the graph, the device consumes 80 mA during the period when it is awake and advertising.

Ouch!! I was looking at the wrong graph. That gives me an average power consumption of 2.8mA, which explains everything. The ESP32C6 clearly isn’t suited for the job. I need to find a better processor.

PS. I forgot to say thanks for such a quick and helpful response

Hi there, So , You see @msfujino is good like that, He knows the 411. Take a look at the newest XIAO Nrf54LM20a that should do everything you need, including the ability to turn off the Sensor for “zero” consumption from it. also can accurately characterise the battery and send you the battery lev…

[image] SenseCAP S2120 8-in-1 LoRaWAN Weather Sensor SenseCAP LoRaWAN S2120 Weather Station provides you with hyperlocal weather at your fingertips. It supports multi-scenario applications like backyard, garden, agriculture, meteorology, urban environmental monitoring, and so on. It enab…

Hi SteveF, Please refer to the link below for related information. I recommend the nRF52 or nRF54. [image] Comparison of Advertising Current for XIAO nRF54L15, nRF52840, and MG24 XIAO My project focuses on minimizing power consumption while transmitting data …

Nice, but kinda defeats the object of building your own :grin:

Thanks. I now have two on pre-order

ESP32C6 + Grove Base Power Consumption

Products & Technology XIAO

msfujino July 2, 2026, 10:42pm 9

Hi SteveF,

Please refer to the link below for related information. I recommend the nRF52 or nRF54.