Search found 21 matches

by chrisb2
Mon Mar 25, 2019 5:12 am
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 2988

Re: powering ESP32 with a battery

The battery is https://www.jaycar.co.nz/18650-lifepo4-battery-1600mah-3-2v/p/SB2307 . You need a charger specifically designed for LiFePO4 batteries, the ordinary LiPo chargers will generate too high a voltage they are full at 4.2V, whereas LiFePO4 are full at 3.65V. My charger is an https://www.ali...
by chrisb2
Sun Mar 24, 2019 6:36 am
Forum: ESP32 boards
Topic: powering ESP32 with a battery
Replies: 12
Views: 2988

Re: powering ESP32 with a battery

I have had no problems with LiFePo4 batteries in this project: https://github.com/chrisb2/water-system Which uses a single directly connected battery. It wakes once a day and battery life seems to be about 3 months. The batteries I have have been recharged numerous times, even including recovering f...
by chrisb2
Fri Apr 20, 2018 8:52 pm
Forum: ESP32 boards
Topic: Wemos LOLIN ESP32 Lite Revision1 - All 6 analog pins?!?
Replies: 5
Views: 1454

Re: Wemos LOLIN ESP32 Lite Revision1 - All 6 analog pins?!?

With loboris fork of Micropython you may be able to use more than 6 ADC inputs if that helps.

https://github.com/loboris/MicroPython_ ... o/wiki/adc

regards,
Chris
by chrisb2
Fri Apr 20, 2018 7:41 am
Forum: ESP32 boards
Topic: Wemos LOLIN ESP32 Lite Revision1 - All 6 analog pins?!?
Replies: 5
Views: 1454

Re: Wemos LOLIN ESP32 Lite Revision1 - All 6 analog pins?!?

From the schematic on wemos wiki looks like you should try the pins labeled UP (pin 36) and UN (pin 38) these are connected to adc1:0 and adc1:3 respectively.

https://wiki.wemos.cc/_media/products:l ... v1.0.0.PSG
by chrisb2
Sun Dec 24, 2017 10:54 pm
Forum: ESP32 boards
Topic: Sleep and RTC
Replies: 2
Views: 941

Re: Sleep and RTC

I have been trying out deepsleep from the pull request https://github.com/micropython/micropython-esp32/pull/85#issuecomment-342372570 by checking out the branch https://github.com/MrSurly/micropython-esp32/tree/dev-deepsleep and building the firmware myself. Both deepsleep for a time period and wak...
by chrisb2
Tue Nov 21, 2017 7:33 am
Forum: ESP8266 boards
Topic: picoweb
Replies: 9
Views: 3347

Re: picoweb

My solution to this problem was to install Virtual box, then install Ubuntu as a guest VM in VirtualBox. You can then follow the STD instructions to build the firmware and copy it to Windows using a shared folder.

Chris
by chrisb2
Mon Nov 13, 2017 6:23 am
Forum: ESP8266 boards
Topic: How do I install esptool on Windows
Replies: 2
Views: 7670

Re: How do I install esptool on Windows

That version of Python should come with pip already install. What error do you get?

What is the result of running the following at the DOS prompt:

Code: Select all

python -V
pip -V
by chrisb2
Thu Sep 28, 2017 7:20 am
Forum: Drivers for External Components
Topic: Micropython library for the TI INA219 voltage/current sensor
Replies: 6
Views: 3645

Re: Micropython library for the TI INA219 voltage/current sensor

I have now verified this library works with an esp32 (Lolin32 Lite), see Using the Library on an ESP32
by chrisb2
Thu Aug 31, 2017 7:03 am
Forum: ESP32 boards
Topic: SPI MAX31855 - Anyone got it working?
Replies: 7
Views: 4704

Re: SPI MAX31855 - Any got it working?

The max31855 data sheet says operating voltage should be between 3.0 and 3.6V, with an absolute maximum of 4.0V, so using 5V may have damaged it?