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HMC5883L - How make a digital compass, Find out the differences between the HMC5883L and the QMC5883L and whether they are compatible.
Secrets of Arduino absolute value abs() - Why it might fail, Why it may cause problems...and how to fix it.
Arduino Analog Output: How to create the most accurate PWM analog ouput and how to create analog PWM sine waves.
Using the ACS758 to measure very high current
Arduino Voltage reference: Both the Uno and Nano have a built-in voltage reference: Find out how to make it more accurate. In addition find out how to use it to measure the supply voltage 1V8 ~ 5V5
Find out how digitalWrite() works...Now use 17x Faster macros!