First of all the exciting news.

I'm extremely happy to announce that I have started a CrowdSupply campaign in order to get the USB Power Injector to people who would find it useful. If you are interested feel free to check it out at CrowdSupply. Now to the experiment

Fast dynamic current measurements

For some measurements using just an amp meter to capture current draw may be insufficient. Let’s say we are trying to capture the maximum current drawn by a Wi-Fi module while it’s making a HTTP request.  Let us explore this exact task using a module with ESP8266 Wi-Fi enabled microcontroller, Micsig CP2100B current probe and a scope. 

The module is programmed to make an HTTP request every second.

As we can clearly see, capturing the maximum current draw is trivial. As well as capturing how often and for how long the transmitter is turned on. This could be of great help when developing battery powered devices, where minimizing the power draw is paramount. Since the USB Power Injector uses standard 4mm banana plugs, it would be equally easy to use a different kind of current probe. For example it would easily interface with popular uCurrent Gold developed by Dave Jones.