Author Archives: Scott Snowden

ESP8266 Successor – ESP32 released with CAN bus support 

So, the interesting little ESP8266 WiFi SoC finally has a younger brother which appears to be even more capable. Among other expansive updates, the 32 bit Dual Core microcontroller still supports WiFi, but also Bluetooth Low Energy, a DAC, many more ADCs, GPIO pins, etc. etc. Lots of good details here: http://esp32.net/ 

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ESP8266 CAN Bus with MCP2515

I have just bought another ESP8266/NodeMCU development board cheapy from eBay (this one) with an ESP-12E chip on board. I’ve also bought an SPI-CAN bus interface with the common Microchip MCP2515 CAN controller to try and create a CAN-Wifi gateway.

The pinout for the ESP-12E NodeMCU board is apparently as below:
ESP-12E NodeMCU Pinout

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3SGTE Mk2 MR2 Turbo Lambda/Oxygen Sensor Part Number

I had real trouble finding a suitable alternative oxygen/lambda probe for my 1992 Rev 2 MR2 Turbo. I can’t find the original Denso part number at the moment, but I managed to find that a Denso DOX-0107 fits the flange size correctly and is 1-wire, it just requires soldering to the original connector. It’s got a Flange 44 type flange which apparently matches the 3SGTE.

I got it from http://service-parts.co.uk/denso-oxygen-sensor-dox-0107

Duke Axial Engine

So a friend told me about the Duke Axial Engine the other day. It’s certainly a very interested idea and does produce some clever solutions to some of the fundamental complexities and disadvantages to the reciprocating internal combustion engine. I always like the idea of novel engine designs, and this one certainly looks like it has potential. Take a look at the video followed by some analysis after the break.

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ESP8266 Lua DHT11 Temperature and Humidity Sensor

After receiving my ESP8266 Development/breakout board I have been attempting to create a WiFi enabled thermostat to control my central heating from my mobile phone and give me a means of timer programming my central heating. To be a true thermostat requires a temperature sensor. The ESP8266 board came with a DHT11 sensor and already has pins directly compatible with one. I therefore just required the software to interface with it.

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ESP8266 Useful Links

ESP8266 Flasher Tool: https://github.com/nodemcu/nodemcu-flasher/blob/master/Win32/Release/ESP8266Flasher.exe

Latest nodeMCU firmware: https://github.com/nodemcu/nodemcu-firmware/blob/master/pre_build/latest/nodemcu_latest.bin

Benlo.com LuaLoader for NodeMCU files and ESP8266 configuration:
http://benlo.com/esp8266/

Simple ESP8266 GPIO Websserver:
http://www.esp8266.com/viewtopic.php?f=19&t=611

ESP 8266 Development Board Schematic:
http://www.bpower.nl/pic/ESP-201-DEV-bw.png

Write up of the ESP8266 Development Board:
http://myesp8266.blogspot.de/2015/03/other-interesting-board-is-this-board.html