UPDATE - ESP8266 nEXT Evo Board - 4x4 Matrix Keyboard - P4 - Page 1
Forum section: electronics / general

author: TJ232
author_rank: Frequent Contributor
timestamp: November 24, 2015, 11:59:59 am
content: Hello,This new board is just a simple ESP8266 Board with USB + Extension Bus (nEXT) and is the result of looking for a smaller and somehow a more flexibile hardware configuration than theCBDB Evolution DevBoard.This is how is looking the PCB for it:and the finished Board:This is the board that was also used for the long run battery tests posted on ESP8266 forum:Ultra low power application schematic: RFCIn this case on top of it was added the RTC/Li-Ion battery charger nEXT module.For more details about, please see related articles:CBDB nEXT Evo Board - General presentation and schematicsCBDB nEXT Evo - Firmware upload and first run tests

author: TJ232
author_rank: Frequent Contributor
timestamp: December 02, 2015, 09:53:13 am
content: And the first Extension board, if you didn't seen it yet, this is AN1, the ANALOG ADC/DAC + I/O Board for CBDB nEXT EVO:http://www.esp8266-projects.com/2015/12/p3-esp8266-next-evo-analog-extension.html.Off course can be directly used with any other MCU, Arduino, etc as long as it has a I2C bus and 3V logic.Basic default functions of the CBDB nEXT AN1 Extension Board:INPUT : 0-40V Autorange Analog frontend / 18 Bit ADCOUTPUT : 4x12 BIT DACTEMPERATURE : I2C Temperature sensor, standard or high precision optionsI/O: 8 Bit I/O Expansion Port

author: TJ232
author_rank: Frequent Contributor
timestamp: December 08, 2015, 09:47:55 am
content: And a Graphical Display option for itMy first option for a Alphanumeric Display still remain theST7032i LCDone, but as I was looking also for a Graphical Display option, I found thisSSD1306 OLEDas a easy to use one with theCBDB nEXT EVO Board.Youtube Video :https://youtu.be/4DzMogqOHWcOriginal article abouthttp://www.esp8266-projects.com/2015/12/mailbag-ssd1306-oled-display-for.html

author: TJ232
author_rank: Frequent Contributor
timestamp: December 10, 2015, 10:13:44 am
content: The SAGA Continues:Part 2 of the ESP8266 nEXT EVO Analog Extension Board (AN1)In this part we will talk a bit about the nEXT Bus I²C protocol and we will start also a longer, multi-part discussion about testing procedures and software programming for the AN1 Board devices and functions (I/O Expansion port, Temperature, ADC, DAC, Voltage measurements,etc.Any related comments, suggestions, ideas, are warmly welcomedThank you,TJ.

author: TJ232
author_rank: Frequent Contributor
timestamp: January 31, 2016, 12:18:08 pm
content: Part 3 of the ESP8266 nEXT EVO Analog Extension Board (AN1)In this part we will continue exploring the ESP8266 nEXT Evo 8 Bit I/O Expansion Port based on the PCF8574 chip from NXP, testing procedures and software programming for the AN1 Board.

author: TJ232
author_rank: Frequent Contributor
timestamp: February 09, 2016, 09:14:36 am
content: Part 4 of the ESP8266 nEXT EVO Analog Extension Board (AN1)In this part we will continue talking about the ESP8266 nEXT Evo 8 Bit I/O Expansion Port based on the PCF8574 chip from NXP, testing procedures and software programming for the AN1 Board.After testing the Output of the 8Bit I/O Port it's now time to test also the Input function.So, what can be easier to use for such a processs than some pushbuttons for interaction? I was thinking about some sort of buttons interface and because I just have arround a small 4x4 Matrix Keyboard why not directly a keyboard interface, especially that I'm waiting to receive some very thin membrane ones to be used for some projects: