HLST (HeroLink Smart Thing) IoT Training Board is a multipurpose board for IoT training projects. The main features of this board are simplicity, ease of use, the ability to change the main modules and also separate access to use the controller pins.
This training board is completely open source and all its design and construction documents, including schematic design files and PCB circuits, as well as codes related to the NodeMCU module are available.

Display type: OLED
Screen size: 0.96 inches
Display interface: I2C
Required voltage: 5 volts, 1 amp
Controller module: NodeMCU on Amica and Lolin models
Temperature sensor: DS18b20
LED type: three colors RGB
Buzzer type: Active

NodeMCU is an open source Lua based firmware for the ESP8266 WiFi SOC from Espressif and uses an on-module flash-based SPIFFS file system. NodeMCU is implemented in C and is layered on the Espressif NON-OS SDK.

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These displays are small, only about 1" diagonal, but very readable due to the high contrast of an OLED display. This display is made of 128x64 individual white OLED pixels, each one is turned on or off by the controller chip.

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The DS18B20 digital thermometer provides 9-bit to 12-bit Celsius temperature measurements and has an alarm function with nonvolatile user-programmable upper and lower trigger points.

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