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Installation of ESP8266 tool chain on Raspberry Pi
Beside the software installation of compiler and tools for flashing the ESP8266 there is also the demand of an appropriate FTDI 3.3V wiring tot he ESP8266.
1. ESPtool – python base tool for flashing the ESP8266
wget --no-check-certificate https://github.com/themadinventor/esptool/archive/master.zip
unzip master.zip
cd esptool-master
sudo python setup.py install
2. LUAtool – libs and samples for coding in LUA language
wget --no-check-certificate https://github.com/4refr0nt/luatool/archive/master.zip
unzip master.zip
3. NODEmcu – firmware for the EPS8266 supporting LUA coding
wget --no-check-certificate https://github.com/nodemcu/nodemcu-firmware/archive/master.zip
unzip master.zip
Flash the NODEmcu firmware
Frist make sure the GPIO0 is wired to GND to allow acceptance of new firmware.
Flash the latest firmware to ESP8266:
pi@raspberrypi ~/esp/nodemcu-firmware-master/pre_build/latest $ python /home/pi/esp/esptool-master/esptool.py --port /dev/ttyUSB0 write_flash 0x00000 nodemcu_latest.bin
Connecting...
Erasing flash...
Writing at 0x00062000... (100 %)
Leaving...
Done - Unwire GPIO0 before the next step.
Now we download the auto startup LUA script to allow the ESP8266 connection to an access point:
pi@raspberrypi ~/esp/luatool-master/luatool $ python /home/pi/esp/luatool-master/luatool/luatool.py --port /dev/ttyUSB0 --src init.lua --dest init.lua --verbose
Set timeout None
Set interCharTimeout None
Upload starting
Stage 1. Deleting old file from flash memory
->file.open("init.lua", "w") -> ok
->file.close() -> ok
Stage 2. Creating file in flash memory and write first line
->file.remove("init.lua") -> ok
Stage 3. Start writing data to flash memory...
->file.open("init.lua", "w+") -> ok
->file.writeline([==[print('init.lua ver 1.2')]==]) -> ok
->file.writeline([==[wifi.setmode(wifi.STATION)]==]) -> ok
->file.writeline([==[print('set mode=STATION (mode='..wifi.getmode()..')')]==]) -> ok
->file.writeline([==[print('MAC: ',wifi.sta.getmac())]==]) -> ok
->file.writeline([==[print('chip: ',node.chipid())]==]) -> ok
->file.writeline([==[print('heap: ',node.heap())]==]) -> ok
->file.writeline([==[-- wifi config start]==]) -> ok
->file.writeline([==[wifi.sta.config("SSID","passkey")]==]) -> ok
->file.writeline([==[-- wifi config end]==]) -> ok
->file.writeline([==[wifi.sta.connect()]==]) -> ok
->file.writeline([==[tmr.alarm(1, 1000, 1, function()]==]) -> ok
->file.writeline([==[if wifi.sta.getip()== nil then]==]) -> ok
->file.writeline([==[print("IP unavaiable, Waiting...")]==]) -> ok
->file.writeline([==[else]==]) -> ok
->file.writeline([==[tmr.stop(1)]==]) -> ok
->file.writeline([==[print("ESP8266 mode is: " .. wifi.getmode())]==]) -> ok
->file.writeline([==[print("The module MAC address is: " .. wifi.ap.getmac())]==]) -> ok
->file.writeline([==[print("Config done, IP is "..wifi.sta.getip())]==]) -> ok
->file.writeline([==[-- dofile ("web.lua")]==]) -> ok
->file.writeline([==[end]==]) -> ok
Stage 4. Flush data and closing file
->file.writeline([==[end)]==]) -> ok
->file.flush() -> ok
->file.close() -> ok
--->>> All done <<<---
Now we can monitor the NODEmcu console and see output of the LUA script:
pi@raspberrypi ~ $ screen /dev/ttyUSB0 9600
NodeMCU 0.9.5 build 20150214 powered by Lua 5.1.4
lua: cannot open init.lua
>
As the init.lua has not yet started either do an RESET, POWER ON/OFF, or enter dofile(“init.lua”) to execute the script.
NodeMCU 0.9.5 build 20150214 powered by Lua 5.1.4
init.lua ver 1.2
set mode=STATION (mode=1)
MAC: 18-FE-34-FE-34-0C
chip: 16659468
heap: 17184
> IP unavaiable, Waiting...
IP unavaiable, Waiting...
ESP8266 mode is: 1
The module MAC address is: 1A-FE-34-FE-34-0C
Config done, IP is 192.168.2.115
>
Done – ESP8266 is now connected to the access point showing its DHCP IP address.
For wiring of the ESP8266 and the VOC sensor please check details here
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