2 layers75.4 × 75.4 mm
53xLIDAR
valerionew/53xLIDAR
53xLIDAR is a solid state, 16 points lidar, based on ST's VL53L1x sensors
61 parts11
2 layers120 × 70 mm
Random number generator based on radioactivity from bananas
- Size
- 120 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 93
- Nets
- 57
- Pads
- 285
- Tracks, vias
- 442, 59
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 5 (file 20170123)
- Created
- 14 Mar 2018
- Updated
- 12 Jun 2022
Overview
BRNG is an open-source printed circuit board by valerionew, from the valerionew/Banana-Random-Number-Generator repository on GitHub. It is a 2-layer board of 120 × 70 mm with 93 parts on 57 nets, routed with 442 tracks and 59 vias.
It is built around the ATMEGA328P-AU, CH340G and LM555N, with the BC847, MMBTA42 and USL1M among its other parts. Its parts include 31 capacitors, 20 resistors, 11 diodes, 5 transistors and 4 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
6
ATMEGA328P-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CH340G
SOP-16-40℃~+85℃ 2Mbps 3.3V、5V USB 2.0 USB to UART SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
LM555N
DIP-80℃~+70℃ 4.5V~16V DIP-8 555 Timers / Counters ROHSHGSEMITimers / Counters
BC847
SOT-231 NPN 100MHz 100mA 100nA 110 200mW 45V 500mV 6V NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)MMBTA42
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mV 300V 350mW 500mA 50MHz 5V NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
USL1M
SOD-123F(SMF)SOD-123F(SMF) Switching Diodes ROHSDIOTECSwitching Diodes
README
README.mdBanana Random Number Generator
Project description
An Arduino based true random number generator. Takes it's peculiar name from the potassium-40 present in bananas, used as radiation source for the random number generatation.
Disclaimer: the radioactivity from the bananas doesn't quite make the difference, the background radiation is more than enough to make the generator work. Potassium is definitely detected, some tests conducted with pure KCl and KOH showed a huge increase in the detector activity.
Project status
The current release is fully working.
Hardware
The hardware is based around the popular ATMega328P and the STS-5 (a.k.a. CTC-5) Geiger-Müller tube.
Software
As of this moment there are available two versions of the firmware:
- minimal_test.c: this version is fully compatible with the unmodified hardware. It uses the hardware interrupt INT0 and has proven to be unreliable when brought into an arduino environment due to interferences with the millis() function from the Wiring core. On it's own works with no problems. Read more on this, in italian
- minimal_test_with capture.c: this version and has proven to be much more reliable than the previous, since it captures the timer stamp via dedicated hardware and it's not subject to software delays. It's based on the timer capture function on PB0/ICP1 pin of the ATMega. This version needs a bodge wire between pin PD2 and pin PB0, as shown below:
I'm currently working on an arduino version on the software, that will be published in this repo as soon as it gives consistent results. In the future another version of the firmware which makes use of the hardware as a plain Geiger counter might be developed. Any help is welcome!
Enclosure
The board is designed to fit in a laser cut acrylic enclosure to protect the user from the high voltage present onboard. The enclosure design files are included and licensed under CC-BY-SA 4.0 license
Parts
93| Qty | Value | Footprint | References |
|---|---|---|---|
| 19 | 100n 50V | Capacitors_SMD:C_0805_HandSoldering | C1, C11, C13, C14, C15, C17, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28 +3 |
| 8 | 100k | Resistors_SMD:R_0805_HandSoldering | R3, R4, R5, R7, R8, R11, R12, R20 |
| 6 | 1k | Resistors_SMD:R_0805_HandSoldering | R10, R13, R14, R15, R16, R19 |
| 6 | 22p | Capacitors_SMD:C_0805_HandSoldering | C3, C8, C10, C12, C16, C18 |
| 6 | LOGO | LOGO | G***, G***, G***, G***, G***, G*** |
| 5 | 220 | Resistors_SMD:R_0805_HandSoldering | R2, R6, R9, R17, R18 |
| 4 | 100n | Capacitors_SMD:C_0805_HandSoldering | C2, C7, C9, C31 |
| 4 | BC847 | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q1, Q2, Q4, Q5 |
| 4 | OSR50802C1E | customfootprints:0802_side_led | D7, D8, D9, D10 |
| 2 | 100u | Capacitors_SMD:CP_Elec_6.3x5.3 | C29, C30 |
| 2 | 1N4148 | Diodes_SMD:D_SOD-123 | D1, D3 |
| 2 | LL-S192UAC-1A | LEDs:LED_0603_HandSoldering | D5, D6 |
| 2 | LL-S194PBC-B4-1B | LEDs:LED_0603_HandSoldering | D2, D11 |
| 2 | LM555N | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U1, U3 |
| 1 | 100 | Potentiometers:Potentiometer_Trimmer_Vishay_T73XW_Vertical | RV1 |
| 1 | 10M | Resistors_SMD:R_1206_HandSoldering | R1 |
| 1 | 12MHz LF XTAL003210 | Crystals:Crystal_SMD_HC49-SD_HandSoldering | Y2 |
| 1 | 15mH | Inductors_THT:L_Radial_D7.2mm_P3.00mm_MuRATA_1700 | L1 |
| 1 | 16MHz LF XTAL003237 | Crystals:Crystal_SMD_HC49-SD_HandSoldering | Y1 |
| 1 | ATMEGA328P-AU | Housings_QFP:TQFP-32_7x7mm_Pitch0.8mm | U2 |
| 1 | Buzzer | Buzzers_Beepers:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | CH340G | Housings_SSOP:SOP-16_4.4x10.4mm_Pitch1.27mm | U4 |
| 1 | CONNETTORE 6 PIN 90° | Pin_Headers:Pin_Header_Angled_1x06_Pitch2.54mm | J3 |
| 1 | DIPTRONICS NDI-02H-V | Buttons_Switches_THT:SW_DIP_x2_W7.62mm_Slide | SW1 |
| 1 | GEIGER_TUBE | customfootprints:Geiger | G1 |
| 1 | ISP | Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm | ICSP |
| 1 | MMBTA42 | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q3 |
| 1 | MOLEX 105017 0001 | Connectors_USB:USB_Micro-B_Molex-105017-0001 | J2 |
| 1 | Polyfuse 500mA | Resistors_SMD:R_1210_HandSoldering | F1 |
| 1 | USL1M | Diodes_SMD:D_SOD-123 | D4 |
The 88 most common of 93 parts.
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Questions
How big is the BRNG PCB?
It measures 120 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BRNG use?
93 parts, built around the ATMEGA328P-AU, CH340G, LM555N and BC847. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the BRNG KiCad files?
From the valerionew/Banana-Random-Number-Generator repository on GitHub, at the commit this page was made from: the board is Hardware/BRNG.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the BRNG design in my own project?
Its repository states no licence, so its author keeps all rights: ask valerionew before reusing the design.