ESP-201 Archives - Scargill's Tech Blog

ESP12 and Memory

April 1, 2016 Peter ScargillESP-12, ESP-12E, ESP-12F, ESP-13, ESP-201, ESP-210, ESP12, ESP12E, ESP12F, ESP32, ESP8266, ESP8266 SDK4 Comments

Anyone writing large projects with the ESP units in C (and probably in other languages without necessarily realising it) will have come across the problems of .TEXT memory. This is the RAM used to store functions. Functions are stored in their own part of RAM called .TEXT memory and it…

EMW3265 ESP8266 KILLER

November 6, 2015November 6, 2015 Peter ScargillEMW6232, ESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-12F, ESP-13, ESP-201, ESP-210, ESP12, ESP12E, ESP8266, ESP8266 SDK12 Comments

Erm, no, though you might think so by this headline.. https://hackaday.com/2015/07/13/new-part-day-the-esp8266-killer Read the comments – the $5 ESP8266 – where? $2 ESP8266 more like it – less, even – http://goo.gl/VB0V9K There’s even a claim that this new single-source board (Seeed Studio) has MORE memory – well at least one variation…

Automatic Router Selection for ESP8266

November 3, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-12F, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, ESP8266 SDK5 Comments

I wonder if anyone who has done this can help. As most of you know, I program my ESP8266 devices in C. I’ve been having some issues with weak signal recently and it would be really nice to have a list of acceptable access points and their passwords – and…

ESP8266 Remote Access

September 29, 2015 Peter ScargillArduino, Eclipse, ESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-12F, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, ESP8266 SDK25 Comments

Notice I titled that remote access as against remote programming – but that’s part of it. Years ago, having gotten sick and tired of dismantling my home control Arduinos just to upgrade the code, I purchased a couple of small units from China which I’ve just thrown in the bin. …

QD Tech Displays on the ESP8266

September 17, 2015September 9, 2017 Peter Scargilldisplays, Electronics, ESP-07, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, ESP8266 SDK, LCD28 Comments

I’ve seen a number of projects using an Arduino and an ESP8266 to drive LCD displays. You may know that my home control has used a 1284-based board (MEGA type) to run a nice Thermostat display for some time now. The displays look very pretty in the right box. THIS…

ESP8266 RAM

September 16, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP82661 Comment

I recently put out a question about the RAM in the ESP8266. In a typical compile, for me I might see… Sections:Idx Name Size VMA LMA File off Algn0 .data 00000894 3ffe8000 3ffe8000 000000e0 2**4CONTENTS, ALLOC, LOAD, DATA1 .rodata 0000275c 3ffe88a0 3ffe88a0 00000980 2**4CONTENTS, ALLOC, LOAD, READONLY, DATA3 .bss 00009a80…

BASIC for ESP8266

September 8, 2015September 8, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP826626 Comments

Don’t get me wrong, we don’t yet have a fully working interpreter, but a link appeared on my ESP8266WIFI Facebook page thanks to Michael Molinari this morning and I thought I’d give it a whirl. http://esp8266basic.com/ I grabbed the Windows loader (Windows 10 put up a SEVERE warning about this…

RGB versus HSV

September 2, 2015September 3, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP82661 Comment

In implementing my own home control solution which you’ll find in this blog “home control 2015” the software has been and remains a work in progress – mainly because I keep finding bugs and adding new features. I’m fairly confident that most of the bugs that have plagued me over…

Driving me NUTS

August 28, 2015August 29, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, modulus, Uncategorized13 Comments

This has been driving me mad and I’ve only just found the answer – thanks to some clues people have given me – but as many of the responses were wrong – you might well find this interesting. I have a an array of 180 bytes – for 60 serial…

EasyTransfer for ESP8266

August 10, 2015August 10, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, ESP8266 SDK13 Comments

I’m going to describe here the transmitting side of the EasyTransfer system as used in Arduino – the reason I did this was because I wanted to ship a bunch of binary data from the ESP8266 to the Arduino where I have a nice little wall mounted LCD display –…

ESP8266 Mesh

Here it is – the ESP8266 Mesh English doc – who will be first to get this going? http://bbs.espressif.com/viewtopic.php?f=51&t=929 The Chinese docs have been out for some time as has the mesh SDK but the English docs just came out today – have fun.

ESP8266 Arduino NetIO Server Demo

August 7, 2015August 7, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, ESP8266 SDK, Espressif6 Comments

This week as regular readers know I was far away from our little home in Spain – in fact I was at MIT (Massachusetts Institute of Technology) in Boston, helping promote ESP8266 technology (why? because I could). Along the way I met up with Ivan Grokhotkov who as some of…

FAB11 – Boston

August 1, 2015April 7, 2021 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, ESP8266 SDK, FAB112 Comments

This coming Monday/Tuesday/Wednesday I’ll be working with Espressif CEO Swee-Ann Teo, Jeroen Domburg, Ivan Grokkhotkov and others at FAB11 in Boston – demonstrating how to use the ESP8266 chips in home control and other applications. Heading off from Alicante (Spain) first thing in the morning tomorrow (Sunday) and arriving late…

ESP8266 Reliability and ID

July 24, 2015July 24, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, ESP8266 SDK9 Comments

Questions for you C programming ESP8266 guys re: the ESP SDK (1.2.0) and some possibly important info on WIFI and MQTT reliability. In the SDK: wifi_station_set_hostname wifi_station_get_hostname HOST ID…. If you do an IP scan on a windows network – ESP units will coming up as IP addresses – and…

Accessing ESP8266 Arrays in FLASH

July 1, 2015July 1, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, Flash23 Comments

A new challenge – the answer to which I will post in here. Accessing an ESP8266 C array in FLASH – i.e. never touching RAM until you actually access something. One suggestion was to ensure you use 4-byte variables.. so I tried this – it compiled – the array is…

Lua Revisited

June 27, 2015June 27, 2015 Peter ScargillEclipse, ESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, LUA, MQTT12 Comments

Back in the dark ages when the ESP8266 was something new, I had a go at the nodeMCU software, essentially implementing the Lua language (or a subset of it) on the ESP8266. At the time I was not familiar with Lua but thanks to some of the excellent resources out…

More ESP8266 Woes

June 20, 2015June 23, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP8266

Updated Sunday 22/06/2015 : The thing about the ESP8266 is there is always something new to discover problems with!! So this week – The new PWM module appears to have issues and as we don’t have the source, we can’t fix them. Right now it will only do up to…

ESP8266 Debug

June 18, 2015June 18, 2015 Peter ScargillC Programming, ESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP826618 Comments

So – I’ve learned quiet a lot in the past few days.. Watchdogs on the ESP8266 Since Espressif SDK 1.01 or thereabouts, watchdog timer operation seems to have changed – delays of any length even in init() are out – or so it would seem? So I got onto Stanza…

ESP8266 RESET

June 17, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP826632 Comments

As often as not, when I reset an ESP8266 by using the system reset call in the SDK, after flashing – for example. if (strcmp(token, “id”) == 0) { if (isQuery) RESPONSE(“ID=%s\r\n”, sysCfg.base); else if (strlen(strValue)>=2){ strcpy(sysCfg.base, strValue); CFG_Save(); system_restart(); } The unit does not come out of reset.. the…

ESP8266 Bliss

June 14, 2015June 14, 2015 Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP826621 Comments

You may have seen comments in here from Richard Burton about his bootloader. Well, I have to tell you – what a game-changer. If you look at a previous blog where I showed you how we’d moved code from the fairly normal 0x40000 starting point down to 0x20000 – freeing…