HOW to Measure Ambient Temperature by Microbit

Overview

In the previous project 23, we only get the analog value of temperature in the current environment. Now, we are going to use a LM35 linear temperature sensor to detect the ambient temperature. Finally get the specific temperature value of current ambient via calculating, and display it on the micro:bit LED matrix or on the CoolTerm monitor.

Component Required

• Micro:bit main board*1

• Keyestudio Micro bit Sensor V2 Shield*1

• USB Cable*1

• keyestudio LM35 Linear Temperature Sensor*1

• DuPont jumper wire*3

• Premium Battery Holder 6-cell AA*1

• 1.5V AA Battery*6

Component Introduction

LM35 Linear Temperature Sensor:

It is based on a semiconductor LM35 temperature sensor. It can be used to detect ambient temperature. This sensor offers a functional range among 0 degree Celsius to 100 degree Celsius. Sensitivity is 10mV per degree Celsius. The output voltage is proportional to the temperature.

There exists a linear relationship between Signal output voltage and Celsius scale. The formula is as follows: at 0℃, output 0V; every 1℃ increase, the output voltage will increase 10mV.

Connection Diagram

Test Code

Test Results

Wire up components，plug in external power and transfer code to micro:bit. Open CoolTerm, click Options and select SerialPort, set COM port and baud rate(115200). Click OK and Connect. Micro:bit and CoolTerm monitor display the current temperature, as shown below: