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Elecfreaks IOT:bit for micro:bit

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IOT:bit is an expansion board based on IoT for micro:bit. It uses ESP8266 as WIFI expansion board and serial port to communicate with micro:bit. 


IOT:bit is an expansion board based on IoT for micro:bit. It uses ESP8266 as WIFI expansion board and serial port to communicate with micro:bit. It also has extended all available IO port of the micro:bit which is leaded by GVS and you can extend various 3V E-blocks as LED, photosensitive and servo by using it. At the same time, the IOT:bit with an on-board buzzer for outside sound and an on-board RTC clock for timing without power supply. Let's create your own IoT by makecode! 


- Integrated ESP12F WiFi、RTC and passive buzzer module
- Extended most IO ports by GVS
- Silk-screen indication onboard main components
- Separately lead IIC interface, directly plug in OLED, BME280 and IIC,etc
- Integrated buzzer and earphone jack
- Adaptive for LEGO (4 standard spacing Lego fixed holes)

Hardware apperance & Parameters 

Items Parameters Remarks
Name ELECFREAKS iot:bit for micro:bit -
SKU EF03426 -
DC supply USB-5V -
Maximum power current 800mA -
Operation temperature -25~80℃ -
WIFI module ESP8266 ESP12F
Buzzer Passive buzzer -
RTC timing DS1307 RTC -
RTC timing battery CR1220 button cell Equipped by yourself
Lead out Not all -
port lead Serial port can map the IO port Coding
I2C port lead 19、20 pin Only for I2C pin
SPI port lead 14、15 pin for common IO
Size 71.00mm X 63.00mm Without packing
Net weight 30.00g Without packing

Size & Installation 

- Product size:71mm x 63mm x 23mm
- PCB thickness:1.5mm
- Hole diameter:2.4mm

Makecode block

- Coding developed by Microsoft and mainly published by micro:bit official.



- Click on `JavaScript` of the `makecode` for `JavaScript` coding.



- Using `MU` for advanced coding method`MicroPython` 


Easy start 

Hardware connection

- First, install CR1220 button cell for power supply to the RTC timing. 

Plug the micro:bit to the Iot:bit.

Using single USB for power supply to expansion board and switch on. 


Coding Platform

- makecode:

Add codebase

- Click on "Advanced" in the MakeCode Drawer to see more code sections.

We need to add an extension for coding to the IOT. Click on the “Extension” at bottom of the coding drawer, then Search for “IOT” and click on the IOT package to add it to your project. (As below picture) 

Note: If you get a warning telling you some packages will be removed because of incompatibility issues, either follow the prompts or create a new project in the Project file menu.

How to drive the buzzer

- There is on-board buzzer on the IOT:bit as below picture. Let the buzzer be connected to the PO of the micro:bit to play music by the `music` of the makecode.

When button A be pressed in the "input", play a bit of music.

Program link:[](

How to use RTC

- There is on-board DS1307RTC timing on the IOT:bit as below picture. RTC timing needs a CR1220 button cell for a lasting power supply. We need the RTC timing to keep accuracy in the event of a power outage. 

Press button A to set the time to the set time. On start with RTC function and the minutes be displayed on the 5*5 allay.

-   Turn off the power after turning off the power for one minute, and the dot matrix display will show the number of minutes after another 1 minute.

Program link:[](

How to use the internet function

- The most important function of IOT:bit is WIKI. The onboard `ESP-12F`WIFI module can connect WIFI and send information. To use port for communication with the micro:bit and the pin `RX-P8`,`TX-P12` is special for IoT.

- Using thingspeak as the cloud to coding and data uploading.

On start, initialize ESP8266 to default connection with P8 & P12.

Connect your own WiFi, input the key and the password.

Under forever loop, connect the thinkspeak and set the date to send, then pause. 

Program link:[](

Down load code

- Let your micro:bit be connected to one side of the USB, the other side to your computer.(Inserting on the expansion board may cause the micro:bit connection to be abnormal or damaged.) 

Then copy your documents to the micro:bit.