3 This is a hardware True Random Number Generator that attaches via USB.
7 Here's a photo of prototype version 0.2:
9 <a href="v0.2/chaoskey-v0.2.jpg"> <img src="v0.2/chaoskey-v0.2-thumb.jpg"></a>
11 ### Version 0.2 Hardware ###
13 * [STM32F042](http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN1823?icmp=stm32f0x2-line_pron_pr_jan2014&sc=stm32f0x2-pr) System-on-Chip
18 * Crystal-less operation
19 * ZXRE1004 zener-diode noise source
21 * AP3015A boost regulator
22 * back-to-back 3904 transistor noise
26 These are photos of prototype version 0.1:
28 <a href="v0.1/chaoskey-v0.1-top.jpg"> <img src="v0.1/chaoskey-v0.1-top-thumb.jpg"></a>
29 <a href="v0.1/chaoskey-v0.1-bottom.jpg"> <img src="v0.1/chaoskey-v0.1-bottom-thumb.jpg"></a>
31 ### Version 0.1 Hardware ###
33 * [NXP LPC11U14](http://www.nxp.com/products/microcontrollers/cortex_m0_m0/LPC11U14FHI33.html) System-on-Chip
38 * 8 12-bit analog inputs
39 * I2C, SPI, async serial
41 * ZXRE1004 zener diode noise source
47 * [AltOS](../AltOS/) is written mostly in C with some ARM assembler
49 * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
50 * [GCC](http://gcc.gnu.org/) compiler and source debugger
52 * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
53 * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
57 The hardware design files can be found on [git.gag.com](http://git.gag.com)
58 in the project [hw/usbtrng](http://git.gag.com/?p=hw/usbtrng;a=summary).