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Quick Tip: HTTP GET with the ESP8266 Thing

SparkFun ESP8266 Thing

The SparkFun ESP8266 “Thing” is one of the cheapest Internet of Things (IoT) platforms available. There are some great examples on how to post data to, but we need to modify that code in order to pull data from a website. That is accomplished with the humble HTTP GET request. I put together a […]

Learning the Teensy LC: Input Capture

Teensy LC input capture test

As a third step to learning the Teensy LC, I decided to tackle input capture. I discovered that there is no separate interrupt vector for input capture; it is the same vector used by the timer interrupt. This means that if we are looking for a timer overflow event as well as a pin change […]

Learning the Teensy LC: Interrupt Service Routines

Custom ISR in the Teensy LC

As a follow-on to my PWM experiments, I wanted to create a custom interrupt service routine (ISR) in the Teensy LC. This would be similar to using the ISR() macro in an ATmega-based Arduino. Because the ARM has different vectors (and some other weird/cool things, like configurable interrupt priority levels), I knew the normal ATmega […]