Class 06: Actuation, LEDs

Slides: 06-actuation.pdf Download 06-actuation.pdf

BlinkM example:

Example Code: https://developer.mbed.org/teams/IDD-Fall-2015/code/idd_blinkm/ Links to an external site. 

The BlinkM is a smart LED module that can be controlled through I2C commands.

Circuit: First connect I2C and power: D7---blinkm D; D6---blinkm C; 3.3V---blinkm +; GND --- blinkm "-"; Add 2.2k pull-up resistors for the I2C bus: 3.3v -- 2.2K -- SDA; 3.3v--- 2.2k -- SCL; 

I2CBus: BlinkMs have default I2C address 0x09. I2C addresses are 7bits, but for some reason, mbed wants 8bit addesses - so shift your address left: 0x09<<1

I2C Commands: Set a color immediately through 'n' followed by one byte each for R,G,B - e.g. 'n',0xff,0x00,0x00 for red.

See at the Datasheet for the BlinkM module for a complete set of commands: http://thingm.com/fileadmin/thingm/downloads/BlinkM_datasheet.pdf Links to an external site.