Search found 454 matches

by devnull
Fri Apr 07, 2017 12:21 pm
Forum: ESP8266 boards
Topic: RTC Calibration
Replies: 7
Views: 3849

Re: RTC Calibration

OK, I see that there are lots of other conversions / translations that are needed to go from pyboard to > esp8266.
by devnull
Fri Apr 07, 2017 11:53 am
Forum: ESP8266 boards
Topic: RTC Calibration
Replies: 7
Views: 3849

RTC Calibration

I calibrate the RTC using a DS3231 which is a very cheap, highly accurate RTC. A calibration to clock quality can be achieved in five minutes using some code here https://github.com/peterhinch/micropython-samples.git . Once you've acquired the cal factor you can remove the DS3231. Put the factor in...
by devnull
Thu Apr 06, 2017 12:39 pm
Forum: ESP8266 boards
Topic: how to import esp8266_i2c_lcd.py
Replies: 2
Views: 1686

Re: how to import esp8266_i2c_lcd.py

You should put the library in the /lib folder. But on different devices / builds the system rootpath is different, on the esp8277 version 1.8.7 this folder is in the root i.e: /lib On later builds and on other devices such as pyboard, the system rootpath is /flash so in that case it would be : /flas...
by devnull
Thu Apr 06, 2017 11:43 am
Forum: ESP8266 boards
Topic: Deep Sleep changes GPIO State
Replies: 9
Views: 3654

Re: Deep Sleep changes GPIO State

Thanks for taking the time to test this and follow up, I appreciate that. I concur with your findings, it appears that the espressif low-power document is incorrect, even though it does state quite specifically in a few different sections that the GPIO state is unchanged during deepsleep. I would no...
by devnull
Wed Apr 05, 2017 11:13 pm
Forum: ESP8266 boards
Topic: Deep Sleep changes GPIO State
Replies: 9
Views: 3654

Re: Deep Sleep changes GPIO State

Hi @Roberthh;

Yes, I did that even before I posted the problem, see my original post:

"I have tried pulling the gate high with a 10K resistor and even switching GPIO13 to an input right before sleep, neither appear to make any difference."
by devnull
Wed Apr 05, 2017 1:00 pm
Forum: ESP8266 boards
Topic: Deep Sleep changes GPIO State
Replies: 9
Views: 3654

Re: Deep Sleep changes GPIO State

Thanks Robert, but that will require me to redesign, remake and re-assmble my PCB which is already mounted in the box and ready to go. According to the espressif documentation, the state of the GPIOs should not change during deepsleep and what I am trying to establish is whether or not this is a bug...
by devnull
Wed Apr 05, 2017 12:02 pm
Forum: ESP8266 boards
Topic: Deep Sleep changes GPIO State
Replies: 9
Views: 3654

Re: Deep Sleep and GPIO State

OK, I have completely isolated the ESP12S from all other components and only connected TX, RX, VIN and GND. Then I connected a DMM between GPIO13 and ground and executed the following code: import machine as mc p13 = mc.Pin(13, mode=mc.Pin.OUT) p13.high() The DMM reads 3.3 Volts as expected. mc.deep...
by devnull
Wed Apr 05, 2017 10:36 am
Forum: ESP8266 boards
Topic: Deep Sleep changes GPIO State
Replies: 9
Views: 3654

Re: Deep Sleep and GPIO State

Thanks, that's not so simple as I have already created the PCB and it is all assembled and ready to be deployed and I will need to cut tracks and hack the PCB to be able to do that.

That will need to be a last resort ;-)
by devnull
Wed Apr 05, 2017 10:24 am
Forum: ESP8266 boards
Topic: Deep Sleep changes GPIO State
Replies: 9
Views: 3654

Deep Sleep changes GPIO State

I have a few sensors connected to my device, in order to conserve power I am using a low resistance p channel FET which enables power to the sensors, the gate is connected to GPIO13, being a P-channel, it is on when the gate is low and off when the gate is high. Right before I goto sleep, I pull GPI...
by devnull
Tue Mar 28, 2017 4:17 am
Forum: Other Boards
Topic: Lopy low lora range
Replies: 1
Views: 1875

Re: Lopy low lora range

The lopy is developed and supported by pycom, you should probably post on their forum.

https://forum.pycom.io/category/6/lopy