## Current of mbed

The current consumption of mbed was measured.

## Measurement condition

• Input voltage: 5V(Supply it from self power USB hub to VIN of mbed).
• The test environment: LED of four every five seconds is lit one by one. This is repeated.
• It takes the average measuring it five times.

mbedCurrentTest

## Measurement result

 times LED Lighting none LED 1 Lighting LED 2 Lighting LED 3 Lighting LED 4 Lighting 1 139.10 141.20 143.10 145.10 146.90 2 139.10 141.30 143.20 145.00 146.90 3 139.10 141.20 143.10 145.10 147.00 4 139.00 141.30 143.20 145.10 147.10 5 139.10 141.20 143.10 145.00 146.90 average 139.08 141.24 143.14 145.06 146.96 diff 2.16 1.9 1.92 1.9

Unit:mA

## Understood thing

• When LED is not lit at all, the current consumption of mbed is about 139.10mA.
• When all of the four LED on the mbed substrate is lit, current consumption is about 147mA.
• Current consumption goes up by about 2mA at the time of each lighting LED 1 piece.

# 日本語(Japanese)

mbed の消費電流を測定してみました。

## 測定条件

• 入力電圧：5V(セルフパワー USB ハブから、mbed のVINへ供給)
• テスト環境：５秒おきに、４つのLEDを一つずつ点灯していくの繰り返し。
• ５回測定し、平均を取る。

mbedCurrentTest

## 測定結果

 回数 LED無灯火 LED点灯１個 LED点灯２個 LED点灯３個 LED点灯４個 1 139.10 141.20 143.10 145.10 146.90 2 139.10 141.30 143.20 145.00 146.90 3 139.10 141.20 143.10 145.10 147.00 4 139.00 141.30 143.20 145.10 147.10 5 139.10 141.20 143.10 145.00 146.90 平均 139.08 141.24 143.14 145.06 146.96 差分 2.16 1.9 1.92 1.9

## 分かること

• LED無灯火の場合の mbed 消費電流は約 139.10mA
• mbed 基板にある４個の LED 全てを点灯させると、消費電流は約147mA
• LED１個の点灯につき、約2mA程度消費電流が上がる。

01 Aug 2010

Hi could you please also post translation as im not that good to read japanese but i would like to know the readings of mA for the mBed. Arigato! :)

09 Aug 2010

Andrej R wrote:

Hi could you please also post translation as im not that good to read japanese but i would like to know the readings of mA for the mBed. Arigato! :)

It wrote in English.
I'm not good at English, and forgive me, please if the mistake is found.
Thank you.

14 Oct 2010

Toshihisa T wrote:

Andrej R wrote:

Hi could you please also post translation as im not that good to read japanese but i would like to know the readings of mA for the mBed. Arigato! :)