Digital Clock + temperature, humidity and CO2 monitor.

Components:

• CPU board: ESP8266 NodeMCU
• Digital clock display: TM1637 4-digits display
• Temperature & Humidity sensor: HDC1080
• CO2 sensor: CCS811

Toolchain

Download xtensa linux64 toolchain from https://dl.espressif.com/dl/xtensa-lx106-elf-linux64-1.22.0-92-g8facf4c-5.2.0.tar.gz Extract it to ~/work/esp8266/xtensa-lx106-elf

Build

Clone the ESP8266_RTOS_SDK sdk and esp8266_iot projects:

cd ~/work/esp8266/
git clone https://github.com/abradianu/ESP8266_RTOS_SDK.git
git clone https://github.com/abradianu/esp8266_iot.git

Setup path to xtensa toolchain and Espressif IDF:

export PATH=$PATH:~/work/esp8266/xtensa-lx106-elf/bin
export IDF_PATH=~/work/esp8266/ESP8266_RTOS_SDK

Build the project:

cd ~/work/esp8266/esp8266_iot
make

MQTT commands

Set MQTT broker ip (default 192.168.1.135):

mosquitto_pub -h 192.168.1.135 -t "sensors/cmd/840d8e8ff6da" -m "{\"cmd\": 5,\"ip\": \"192.168.1.112\"}"

Set MQTT client name:

mosquitto_pub -h 192.168.1.135 -t "sensors/cmd/840d8e8ff6da" -m "{\"cmd\": 4,\"name\": \"room1\"}"

Get device info:

mosquitto_pub -h 192.168.1.135 -t "sensors/cmd/room1" -m "{\"cmd\": 2}"

OTA:

Start a HTTP server:

cd ~/work/esp8266/esp8266_iot/build
python -m SimpleHTTPServer 8070

Send the MQTT OTA upgrade command:

mosquitto_pub -h 192.168.1.135 -t "sensors/cmd/room1" -m "{\"cmd\": 1,\"server\": \"192.168.1.140\",\"port\": 8070,\"file\": \"esp8266_iot.bin\"}"