Scoobas Solution Sensing Tactic

Posted on Feb 5, 2014

This document has several purposes, and a primary one is to record what I have learned about the means that a Scooba robot uses to detect: a) the presence of an acceptable cleaning solution being delivered to its pump, and b) the excess presence of used solution collected off the floor and stored in the Tank`s waste chamber. In the same manner tha

Scoobas Solution Sensing Tactic
Click here to download the full size of the above Circuit.

t this document will serve to remind me about Scooba`s liquid sensing details, it may help other Scooba owners understand Scooba`s two, "Clean-Empty", and "Waste-Full", sensor sub-systems. Then, finally, within that group of "understanding owners" there may be some that still use the model 5900 Scooba, the first Scooba ever, and one which required a cleaning solution conductivity somewhat higher than that of their owner`s municipal tap water; and, some of that subset of owners may be continuing to wish they could convert their 5900 to perform using plain tap water. This document contains information that should accomplish such a conversion. I should state right away that the specimen Scooba model which has yielded its liquid-sensing circuits for use in this document is the "5900". I hasten to point out that all other models (which were later re-worked, re-designed, or newly designed) to accept plain tap water, may have either different values for certain resistors on the main_elex PCA, or firmware, "F/W", adjustments of threshold, or there may have been changes in both H/W & F/W. Easing into to this topic will be done by talking to a simplified schematic diagram used in these sensor circuits (it is basically a voltage divider, and complicated only by the clever way that iRobot uses outputs from two square-pulse generators to stimulate the sensor head). More complete schematics will be revealed and discussed at later points...

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