As far as I recall, the analog pin is pin 6 & so not on a corner. It was no=
t easy to solder to. I only did it because I wanted to try the ADC & only h=
ad esp-03 modules.

I used the finest soldering tip I had and a microscope with lots of light o=
n the device. I tinned a bit of wirewrap wire, then carefully applied a sma=
ll amount of solderpaste to the ADC pin. It's really easy to make a mess he=
re.

Then I carefully dipped the tinned end of the wire to the blob of paste & q=
uickly soldered. It's not something you should try in production & maybe I =
just got lucky. Could just as easily have trashed the module......

My tests indicate that the ADC is poor with a restricted range & as far as =
I can tell it does not have a good reference. I'd be pleased to be proved w=
rong on this. I'd say its fine for many applications though.

Joe


_______________________________________
From: piclist-bounces@mit.edu [piclist-bounces@mit.edu] On Behalf Of James =
Cameron [quozl@laptop.org]
Sent: 01 September 2015 11:06
To: Microcontroller discussion list - Public.
Subject: Re: [EE] wired analog of ESP8266?

I've not used an ESP8266 with the Arduino IDE extension.

I've been using ESP-01 (qty 10) and the Sparkfun ESP8266 Thing (qty
2).

The deep sleep low power mode needs a jumper from EXT_RSTB (32) to
XPD_DCDC (8), which is easy on the Sparkfun board, but hard (for me)
on the ESP-01.  I'd welcome comments on how to solder to just one pin
on the QFN32 package.  At least it is a pin on a corner, and there's a
bit of pad exposed!

The deep sleep works fine in my NodeMCU experiments.

The ESP8266 is really limited in resources and pins; which can lead to
wasted time in cramming.

My experiments so far have been;

- a captive portal, for providing an isolated access point with an
  information page for an artwork or tourist location,

- a TCP stream gateway to UART then to another micro acting as an I/O
  expander,

- a DS1820 to UDP gateway, reporting temperature to a server,

- a 10 Hz UDP echo request and reply setup which blinks the TX LED on
  an ESP-01, for use in estimating coverage around an access point,
  which is about 400m on farm at 1.90m elevation,

- a TCP file server for access to the onboard Flash filesystem,

- a UDP server for reading the GPIO pins on demand, combined with a
  UDP client on the same device which reports pin state changes,

- a UDP server for writing to the GPIO pins,

- an NTP client, for getting network time,

- a TCP server hooked to the UART, as a remote serial port accessed
  with TELNET or similar,

- a UDP server driving a WS2812 addressed LED.

Many of them were derived from work by others.

--
James Cameron
http://quozl.linux.org.au/
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