Search found 111 matches

by Capstan
Fri Mar 29, 2019 2:14 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 480

Re: powering ESP32 with a battery

Thanks for the link, looks like they do ship to the US.
by Capstan
Wed Mar 27, 2019 2:48 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 480

Re: powering ESP32 with a battery

It sounds like most LiMnO2 aren't suitable for outdoor use? Also the ones I am seeing have a very low discharge current rating. Where are you getting LiSOCl2 batteries with a good current output? Here's one that is under 200mA, may not work for ESP32. https://www.amazon.com/dp/B07K8G2QBM/ref=sspa_dk...
by Capstan
Tue Mar 26, 2019 11:08 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 480

Re: powering ESP32 with a battery

Ah, got it. Not rechargeable but not really necessary to recharge them for quite some time for many IoT applications. And inexpensive enough to just replace eventually.
by Capstan
Tue Mar 26, 2019 2:23 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 480

Re: powering ESP32 with a battery

Interesting! LiSOCl2 batteries I am seeing deliver 3.6V, which is the very top of the ESP32 range but should work. LiMNO2 batteries make 3V. Long shelf life is great.

How much do they cost? I am seeing these batteries online but no prices. Do they require special chargers?
by Capstan
Mon Mar 25, 2019 2:37 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 480

Re: powering ESP32 with a battery

Thanks for sharing that info. Expensive battery! I am looking at some other alternatives like this; https://www.batteryspace.com/lifepo4-18650-rechargeable-cell-3-2v-1500-mah-4-5a-rate-4-8wh-with-iec-62133---un38-3-passed.aspx with similar capacity and a lot cheaper. Very possible that the charger I...
by Capstan
Sun Mar 24, 2019 1:55 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 480

Re: powering ESP32 with a battery

Nice project!

I see that you are using a 18650 battery. What brand is the battery and where do you get them? Also curious to know how you are charging them. It's possible that the charger I am using damages the batteries.
by Capstan
Sat Mar 23, 2019 11:26 pm
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 480

powering ESP32 with a battery

I've got some use cases that require the ESP32 to hibernate most of the time in very-low-power mode running on a battery. Ideally the battery would last quite some time with a hibernation power draw of only ~15uA. Can anyone recommend some options for a good cheap rechargeable battery? I was hoping ...
by Capstan
Mon Oct 08, 2018 2:24 pm
Forum: ESP32 boards
Topic: interesting peripherals driver library
Replies: 1
Views: 267

interesting peripherals driver library

I was looking at CircuitPython yesterday. Adafruit posted a ton of driver code for it. Probably could be adapted to other MicroPython versions.

https://circuitpython.readthedocs.io/en ... ivers.html
by Capstan
Tue Aug 14, 2018 3:16 am
Forum: ESP32 boards
Topic: Sparkfun ESP32 board
Replies: 9
Views: 809

Re: Sparkfun ESP32 board

So it is working for you? What cued you to change the flashing options to those particular values?
by Capstan
Mon Aug 13, 2018 10:31 pm
Forum: ESP32 boards
Topic: Sparkfun ESP32 board
Replies: 9
Views: 809

Re: Sparkfun ESP32 board

How are you flashing it?