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The Mysterious HMC5883L Print E-mail
Written by Wayne Truchsess   
Sunday, 13 March 2011 12:33

AsHMC5883L most people know Honeywell recently discontinued production on the popular HMC5843 3-Axis Magnetometer.  Honeywell replaced it with the HMC5883L which has a better resolution, larger full scale range, consumes less power, comes in a smaller package and most importantly...it's much CHEAPER in price! Needless to say I placed a backorder for the parts in December and was pleasantly surprised when they arrived yesterday.  I pulled out the prototype board I had made and proceeded to mount all the components.  I placed the populated board in my handy reflow oven and a few minutes later...VOILA....we had a breakout board.

 
Effects of Varying I2C Pull-Up Resistors PDF Print E-mail
Written by Wayne Truchsess   
Saturday, 18 December 2010 16:44

Internal-Pull-up100kHz

I2C is a popular communication protocol in embedded systems.  When interfacing with the slave device a pull-up resistor is needed on each bi-directional line.  One common question that arises is "what size pull-up resistor should I use?".  Instead of going through a bunch of theory and calculations I thought it would be easier to show what happens to the signals when different resistor values are used.

Since the Arduino is a popular micro-controller among hobbyists we'll use it for the following examples.  We'll interface the Arduino to a DS3231 Real Time Clock, which is a 5 volt device.  We'll also look at the effects on the signal with varying speeds of I2C (100 and 400kHz clock signals).

 
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