Domotics with an esp8266

1. Connect
2. Flash firmware
3. Communication
4. Test
5. Upload scripts

find usb serial device with lsusb. Bus 004 Device 010: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port

sudo modprobe usbserial vendor=0x067b product=0x2303

Connect esp to USB to serial

VCC -> 3.3v
GND -> GND
Rx -> Tx
Tx -> Rx

For flasing mode connect also

GPIO0 -> GND
CH_PD -> 3.3v

You should now see that it is now showing as attached by running dmesg.

[11357.143838] usbserial: USB Serial support registered for pl2303
[11357.143891] pl2303 4-1.2:1.0: pl2303 converter detected
[11357.146034] usb 4-1.2: pl2303 converter now attached to ttyUSB0

Recourse: https://nodemcu.readthedocs.io/en/release/getting-started/

Build the nodemcu firmware with site or with docker image

git clone --recurse-submodules https://github.com/nodemcu/nodemcu-firmware.git

Change the modules in nodemcu-firmware/app/include/user_modules.h Enable bme280, bme280_math, file, GPIO, I2C, mqtt, net, node, ow, tmr, uart, wifi. Build the firmware

cd nodemcu-firmware
docker run --rm -ti -v `pwd`:/opt/nodemcu-firmware marcelstoer/nodemcu-build build

install flash tooling

sudo pip3 install esptool

flash firmware

sudo python3 -m esptool --trace --port /dev/ttyUSB0 --baud 115200 write_flash 0x00000 nodemcu-firmware/bin/nodemcu_float_release_20210105-1953.bin

when problems with flashing, try connecting, this works when your esp device keeps listening to serial and isn't ready to receive new firmware.

GPIO 0 -> GND
RST -> 3.3v

try format, remove extra wires and monitor with gtkterm

sudo python3 -m esptool erase_flash

using gtkterm for serial communication

sudo gtkterm --port /dev/ttyUSB0 --speed 115200

write hello world or something to test it.

file.format()
file.open("init.lua", "w")
file.writeline([[print("init lua node")]])
file.close()

node.restart()

install tool to upload files to the esp

npm install nodemcu-tool -g

upload the script to the esp

nodemcu-tool upload --port=/dev/ttyUSB0 init.lua

after uploading restart the esp. Connect with serial terminal and execute the command

node.restart()

scripts that use wifi import a credentials.lue. This contains the SSID and password

-- Network Credentials
ssid=<insert SSID>
pass=<insert password>