ESP-8266 Al Cloud Inside

ESP-8266 Al Cloud Inside

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The ESP8266 is a WiFi SoC that can cost as little as $5 mounted on a PCB. Without shipping charges from Hong Kong, some are even available for under $3. It’s has a RISC architecture 106micro Diamond Standard 80 MHz core (LX3) made by Tensilica with 64KBytes of instruction RAM, 96KBytes of data RAM, 64KBytes boot ROM, and an external 1M flash chip. There are several pages elsewhere at mbed.org with info on the ESP8266 along with drivers and demo code.

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The ESP8266 is a WiFi SoC that can cost as little as $5 mounted on a PCB. Without shipping charges from Hong Kong, some are even available for under $3. It’s has a RISC architecture 106micro Diamond Standard 80 MHz core (LX3) made by Tensilica with 64KBytes of instruction RAM, 96KBytes of data RAM, 64KBytes boot ROM, and an external 1M flash chip. There are several pages elsewhere at mbed.org with info on the ESP8266 along with drivers and demo code. This page is for anyone using it with the mbed LPC1768 platform and the ESP8266 module currently available from Sparkfun. Code examples posted elsewhere with ESP8266 drivers have been modified for this mbed platform and the module Sparkfun is currently shipping (code elsewhere on other pages does not work with this module and the LPC1768 pins listed without a couple changes). The ESP8266 comes with pre-installed firmware and the firmware seems to change a bit from older modules to newer modules. The default baud rate of 115200 can apparently change along with the exact command response with some of the different firmware versions. This also forces small changes in some of the codes communication timeouts. It is possible to load new firmware on the device and even write your own firmware, but the focus here is on using it with mbed with the default firmware to add WiFi support to this mbed. The default firmware uses a basic WiFi AT command set on a serial port with TTL levels. The mbed code examples send these AT commands and monitor or display the returned status messages. There is a new mbed library in development for the ESP8266, but these examples use the serial port directly to send the AT commands. A Wi Fi access point or hotspot will be needed to use these demos. A PC or Mac can be used to setup a Wi Fi hotspot when there is not a Wi Fi access point already setup. Many Windows PCs with just Wi Fi can setup a PC mobile Wi Fi hotspot or hotspot using a Mac or new hotspot setup instructions for Windows 10. This chip can also be a Wi Fi access point, but that feature is not used in the demos here. Wiring It is not breadboard friendly in this module package, but with a half dozen M/F flexible jumper wires connected to the dual header pins it can quickly be hooked up to a breadboard. My module also needed a 330 uf decoupling capacitor across the 3.3V power lines – it seemed to reset often without this. Put the capacitor near the power pins for the module. It seems likely that at least some of the modules briefly draw just a bit too much power for this mbed platform – likely during a RF transmission burst at max power output. The data sheet says around 200mA, but some blogs report 250-300 mA Max. The capacitor will enable running these demos without a second power supply when nothing else is connected to mbed. To be 100% safe, whenever other devices are being used with mbed that take any significant current at all, another 3.3V supply should be used for the ESP8266 (with the grounds tied together). A second 0.1 uf capacitor from 3.3 to gnd might not be a bad idea for high frequency noise (it is not filtered by electrolytic capacitors as their C value actually drops off with increasing frequency). A small percentage of the modules still draw too much power even with the capacitor, and if they reboot often or reset mbed’s power circuit (blue power LED blinks on and off slowly) they will require a second 3.3V supply. If a second supply is used for the ESP8266, connect the gnd to mbed’s gnd! MFJ M/F flexible jumper wires for hookup of Sparkfun ESP8266 module /media/uploads/4180_1/esp8266pinout1.png ESP8266 module – top view with pins below.

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