During the pause time (Step 3), the voltage rises a bit. The drop in voltage occurs at the times when Vector is driving in a square (Step 2). The following figures plot the voltage drain for Vector and Cozmo.īattery voltage (actual in blue and drain rate in orange) for Cozmo Analysisįirst, note the see saw curve in the voltage drop for Vector.
So how did Anki Vector and Cozmo perform. Please monitor this space for my Twitter feed for updates. We will release the benchmark open-source once we have cleaned up all the code. This measure gives us a good idea of how the battery voltage drains over time. In this particular case, we compute the 15 minute moving average of the derivative of the measured battery voltage. Wavefront also allows us with a lot of tools to analyze and interpret this data. The measured voltage is fed to Wavefront for easy monitoring and visualization. We hope that such issues have very minor effects to the comparisons made and analysis provided in this article. Moreover, note that the Anki Cozmo SDK and Anki Vector SDK are two separate python packages, so there might be differences in the way a connection is maintained to the robot. Unfortunately, Anki does not have any API to measure the current drawn from the battery, nor does it specify the accuracy of the voltage observed hence we will have to live with the voltage returned by the API for this evaluation. The voltage at the battery is measured using the standard API commands. Instructs the robot to drive back to the charger once Step 4 is complete.Executes steps 2 and 3 through multiple iterations, till the battery volatge drops by 0.2 Volts.This pause is done mainly to simulate idle activity in robots, that is periods of time when a robot may not be doing any task but just waiting for the next instruction. Pauses for a time of 30 seconds between each iteration of driving a square.We use a simple program to make sure that both the Cozmo and the Vector can perform the identical task. In short, this program drives the robot is a square of length 20 cm, and returns to the origin after driving the square. Uses the “Drive in a Square” example program that Anki provides to simulate robot activity.Drives off the battery charger after making sure that the battery is in a fully charged stage.The benchmark consists of the following steps: We designed the benchmark around common guidelines of testing battery performance, such as that documented in. In order to evaluate and compare battery performance between two products, we need a benchmark. have a great evaluation on the voltage drain behaviour of a lithium-ion battery in. The high energy density lets manufacturers such as Anki pack a ton of energy in small devices such as the Vector and the Cozmo. LIBs are popular of very high energy density and a long battery life. The most common batteries used in cellphones, laptops, tablets, and other electronic gadgets are the Lithium Ion Batteries (LIBs). Lets first visit the basics of battery performance. In this article, we compare the battery voltage drain rate as a function of time for two of Anki robots, the Anki Vector, first released in October 2018, and Anki Cozmo, first released in October 2016. Moreover, since the Vector is representative of a full-scale industrial robot, it is a great candidate for evaluation of the current state of battery technologies in robotics. Given the high interest in how Vector’s battery performs, we thought that it was document an unbiased third party investigation. A mobile robot needs a battery, and can be active only as long as it retains battery power. Indeed, battery life is an essential ingredient of a robot, and by extension, for Internet of Things (IoT) devices. Many of the discussions in social media about the story seemed centered around Vector’s battery performance. In my previous story, I discussed how a simple program can be written to monitor Anki Vector 24x7.
0 kommentar(er)
