As a startup grows, so does the bathroom line.

Percolate has outgrown our office space, so the mention of Arduino technology during Hack Day kick-off quickly birthed an idea. We can build a way to check if the bathroom’s vacant from the comfort of your desk.

When Team Bathroom assembled–near the bathroom, of course–the first move was out the door. A shopping trip was in order.

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At Canal Alarm Devices, the team picked up magnetic sensors to detect when the bathroom door opens.

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Say hi everybody! From left above: April, Percolate office manager; Ian W, ops; Erik, mathematician; and Noah, co-founder and head of product.

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There was a moment of reflection on Canal Street: How is this going to work exactly? The magnets tell a website if the toliet was vacant or occupied, if the door is open or closed. Visit a website to see and, if the door is closed, put your name–better yet, your Twitter handle–in the queue. When it’s your turn, you receive a tweet.

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Then it was time to execute. Back at the office, April learned to code for the first time.

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And Ian and Erik got to programming the Arduino.

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Clearly, more field trips were eventually in order.

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Meanwhile Brand Strategists Kunur and Jo selected the Twitter handle @PercolateWC and eventually wrangled a designer, Erin, for a crash-course in wireframing.

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It took a bit of time for Kunur and Jo to find the wireframing templates.

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At lunch, the team got a visit from Noah’s wife Leila. Clearly the Twitter bathroom reporter idea was born years ago: At Naked Communications, back when Twitter was first taking off, Noah sat near the loo and kept the office informed: “available,” “not available,” “hold off, someone took a while in there.”

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Soon enough, Ian got the hardware working. Kunur, otherwise useless in these situations, put it on Vine.

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And a working prototype was born in one working day. Awesome job Team Bathroom and on-the-fly recruits Doug and James OB.