Real random byte

This project is inspired by the "Random Noise Sources" that you can see at this link http://www.ciphersbyritter.com/NOISE/NOISRC.HTM . The operation of "Real random byte" is quite simple ,the random thermal noise current (through zener lm336) is amplified by the transistor(2n2222) and converted into voltage fluctuations. The signal on the transistor collector is further amplified by a differentiator(made with tle2141). Finally, processor(stm32) analyzes the signal ,through some filtering algorithms and reduction of bias, obtaining random bytes. "Real random byte" have the capability to communicate using Bluetooth. The processor(STM32) is programmed to send a random byte(8 bit) each time it receives hexadecimal value "0x00".

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Oscilloscope BT

The project idea was born from purchase of a system of smallest development for STM32F103C8T6 bought above ebay platform for about 2,5€. The main purpose was the one of using it to build something of useful and amusing, so I decided that it would have been interesting to try to produce a simple and cheap oscilloscope. I began to think about the project, produce the software and choose all essential hardware, the idea was the one of maintaining the cost under 10€. to ensure that the assembly work was simple and appropriate also for whom does not have particular knowledge of electronics . After a few months of fine-tuning this little project was born , it is very funning and instructive to produce , a simple oscilloscope that uses a device Android ( phone, tablet) with which interconnects through Bluetooth for trace visualization. 

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                                                           Download arduino stm32file