The TweetWriter is a low-cost text-plotter. It can plot your tweets, the time, the weather and even the pollen-index for birch and grass in Lyngby! And if you have pollen allergy you can have a handkerchief from the orange box on the side of the TweetWriter.

It is made of -acrylic sheet 3mm 60x40 - 60kr -veneer sheet 5mm - 30kr -bolts and nuts m3 and m2 x35 - 50kr -a steppermotor (28BYJ-48) - 8kr -three servomotors (2x TowerPro Microservo sg90 and 1x RoHS SM-S2309S) - 36kr -an ESP8266 - 42kr -a breadboard - 12kr -a lot of wires - 20kr -photosensor (GP1A51HRJ00F-SHARP) 30kr. -glue -20kr

Overall cost in materials (assuming you have a lasercutter, a node-red account and a given API key for your ESP8266): 308kr

It is constructed to use as little material as possible, and to be assembled quickly. And there is no top for it so you can watch all what's happening inside. The complicated part of this project is the code and using the right library, but with our code and some calibration everything but the photointerrupter will work (even thou this worked on the OLIMEX-experimenting board).

To get a visual view on how the TweetWriter is surpose to be sampled look at the CAD-files, thise arrent completely wright, so use the LaserCut files to make the parts.

Follow your blog for further information and nice videos https://kaempetronics.wordpress.com/category/ibm-bluemix/