Passive sensor. In the first revision of the passive sensor, I was able to fit both the 13.56 MHz antenna and NFC eeprom memory with the most "harvesting" function awesome for me !!! . Harversting converts the energy of radio waves from our smartphones into direct current to power our brains.

 At 1.8V, we can get 3 mA in the best case. It was not quite easy to find a digital temperature sensor for such a potential difference. . ATTiny 85 will process all raw and ready-made info, at the moment it’s just kept within the price tag with all the necessary functionality and dimensions.

Another feature will be "Silk-stencil". I came up with the idea of ??using silk-screen printing as a stencil with a thickness of 0.1mm. How come I miss the credit card (instead of the spatula) board with the solder paste board and scatter the components. Hair dryer in the hands and heat began.