Make Every Week: Temp -> Text -> Table

Texting temperature data to Twitter is fun, but more useful is sending that information to a table.

That’s what I did this week, as my wanderings into wireless data collection continue: Post the temperature and humidity from my little experiment to a table at data.sparkfun.com.

Here are the steps as things stand now:

  1. The sensor reads the data (as in my original post).
  2. The Ardunio formats a message and texts it with a Fona (wiring details here, updated code here).
  3. Instead of texting to Twitter, it now texts to a phone number I bought at Twilio for $1/month.
  4. Twilio then relays that data to my project server in the Amazon cloud as an http “POST” (deets on setting up a cloud server here).
  5. My project server parses the text message, composes a URL with the data, and hits the Sparkfun open data system with that URL (code for that is here).

This all happens in just a few seconds, every 20 minutes.

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Make Every Week: Circuit Boards, For Reals

I always considered circuit boards like this something you bought, not something you made.

Not any more.

I actually helped to make the board in the picture above. And it was awesome fun.

The board is designed to monitor the conductivity (and, possibly, contamination) of water in lakes and streams, with the wonderful feature that it fits through the mouth of a regular water bottle. It’s called Riffle and it is the brainchild of Don Blair, who’s working with Public Lab and the MIT Center for Civic Media. This week I had the honor of working with Don at MIT.

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Make Every Week: Heartbeat LEDs

Visualizing one’s heartbeat is just cool. I’ve been into the idea since I learned that signals sent by the Polar heart monitor straps joggers use can be detected with a cheap device.

I’ve made a heartbeat hoodie, which was a lot of fun. But in the end, a bright, flashing sweatshirt starts to annoy the people around you. Now I’m working toward a more wearable wearable, one that changes subtly as my heart beats faster or slower.

This week I took a step on the way to that wearable by getting three LEDs — blue, green and yellow — to light up according to my heart rate. A calm heartbeat and blue glows, a little faster and you get green and really fast lights the yellow one.

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Make Every Week: Sewing-Machine Circuits

Sewing by hand can be tedious. Sewing by hand with conductive thread is frustrating.

The thread I use is almost woolly, so if you use too much at once, it twists and tangles in itself. Ugh.

For a project I have in mind, there would be much sewing with conductive thread. But we recently got a sewing machine, and this weekend I thought … heeeeey! The thread actually comes in little bobbins. Maybe I could load one in the machine?

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Make Every Week: DIY Accent Lighting

For years, we’ve talked about adding accent lighting to our living room — particularly under the TV on the wall, to light up a small shelf underneath.

I’ve put it off. I just didn’t want to deal with the wiring, the mounting, the falling down, the mounting again. Even finding a fixture was daunting.

But then I spotted these adhesive-backed LED strips! Which can be powered by a 9-volt battery. Excellent.

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