sallen135 wrote: ↑

Wed Jan 02, 2019 11:02 pm

Hello,

I am using the DOIT ESP32 DEVKIT V1. I am trying to power it using an 18650 ranging from 3.3v-4.2v.

Also see https://www.esp32.com/viewtopic.php?f=12&t=8451

From https://wiki.wemos.cc/products:d32:d32_pro
follow the link to https://wiki.wemos.cc/_media/products:d ... v2.0.0.pdf

ESP_Sprite wrote: ↑

Thu Dec 20, 2018 2:29 am

There still should be no reason why semaphores should break when you enable WiFi.

This post, which contains some code, https://www.esp32.com/viewtopic.php?f=2&t=3980, could possibly be a related problem.

1. What is the best place to order a bunch of Meshkit Lights from the Netherlands? AliExpress? Or is there a better online marketplace I should get it from? On taobao.com, search for ESP32-MeshKit-Light which gets you 5 lights for about $64 USD directly from Espressif. You'll need a freight forward...

I did get the chemistries mixed up for a moment. The MP2161 has IQ of 17μA. That seems to be a much smaller issue than throwing away 0.16W (3.7V to 3.3V at 400 mA at full load) from a linear regulator. In the end, whether you want a regulator that operators most efficiently at low load or high load ...

[deleted]

meneldor wrote: ↑

Tue Dec 18, 2018 7:05 am

Have anyone tried SP6205EM5-L-3-3 or MCP1726-3302E/SN?

Consider these switching regulators, instead of linear regulators, instead:

The EA3036C is under $0.15 per unit
The MP2161 is under $0.10 per unit
The SY8089 is under $0.09 per unit

Also see https://www.esp32.com/viewtopic.php?f=12&t=8451

If your equipment is installed outdoors (or any place with direct sun light) then you can add a 1W solar panel for about $1.50 and a solar charge controller for $1.

It sounds to me like you have a defective PCB, which is more likely than a defective chip.
You should contact the seller, they will probably send you a new one for free.

Thanks for the idea. Even a LiFePO4 battery has a voltage which is too high while it is charging. LiFePO4 battery is charged to 3.6V (or 3.65V) and this is within ESP32 voltage range. You can limit the charger voltage to 3.5 V and the battery will still be charged to 99% - 100% depending on type. I...