Shared Projects

For TinyTeRPs v2! Visit mrl.umd.edu for schematics and more information

Second version of the positive feedback cantilever driving circuit

Very nearly a ATtiny breakout board…

SRK driver

ATtiny85 Prototype Tool

St-linkV2Clone

https://github.com/hpux735/Skyworks-LNA-designs (6524b53)

Arduino Compatible micro-controller using Atmega 328. You can load your code through Arduino IDE. This controller is smaller but as powerful as Arduno uno. Checkout my EAGLE file: https://github.com/baixiaobest/Project-Genesis

On-board ATmega328 with ISP header and all PORT pins broken out to individual LEDs and headers. Additionally, there is an over-voltage and over-current protection circuit with an indicator LED.

$12.35/set of 3. Untested, but will update this.
2 pieces break-apart and stack to form the dense, versatile FTDI module for the Modul-Ar-duino.
Designed in pieces to make repair easier/quicker for those who may occasionally fry things, e.g. inexperienced students. Just unsolder the headers and solder on a new FT232RL carrier board. That way you’re back up and running quicker; replacing the dead chip can be done later.
Additionally versatile; can be populated with your choice of USB connectors- type B, A-mini with SMD or pT/H anchor tabs. Has DTR cap onboard for auto-reset of arduino, and optional shorting jumper for it, as well as DTR/RTS and 3v3/5V selection jumpers.
Also can be populated with your choice of male/female 6pin headers, top or bottom, 1x6 or 2x6 (use for greater height offsets) in either pin-thru-hole (pT/H) or surface mount (SMD) style - though you may want to scratch off the solder mask between the pairs of holes for the 2x6 connector to use SMD.

https://github.com/kicksat/avionics

Talon_SRX_1.1

for any foursevens quark and a triple 20mm Noctigon with 3 different emitters-

• Red XP-E2 for moonlight
• White Nichia 219 for medium modes with very high CRI
• White XP-L for more light (like a turbo but not just a single mode)

The red XP and the Nichia are the main emitters (head loose), because of the limited capacity of currently available 17650’s a low drive current is used for extended runtime, tighten the head and the FET turns on to run the XP-L at higher current for “turbo”.

Red will turn off above moonlight however both white emitters will run with the head tight. Moonlight (red) operates in either head loose or head tight modes and will only be on by its self (regardless of head state). EVEN WITH HEAD TIGHT (TURBO) ALL MODES STILL WORK!! “Turbo” simply adds in the second white emitter (the XP-L), it runs in tandem with the N219 using PWM dimming!

This concept can be used on any light with anodized head threads however its to large for a 17mm driver compartment, will need sized down for other lights.

INA125P breakout board to use load cells and other transducers with Arduino / Raspberry Pi etc.

Github Repo: github.com/cgrossde/LIR2450-USB-Charger

Based on MCP73831. Beware not tested (yet).

There are two charge modes:

• fast (45mA)
• slow (25mA)

Max charge current for a coin cell is usually between 80% and two third of it’s capacity. So you could charge a 100mA coin cell with 80mA. I wanted to increase the lifetime of my coin cells and reduced the charge current. If you want to have different currents here is the equation to calculate R_SLOW/R_FAST:

mA = 1000 / R in kΩ

Example: 1000/20kΩ = 50mA

BOM:

• MCP73831 SOT-23-5
• 0603 LED Green (~3.1V voltage drop)
• 0603 LED Orange (~2V voltage drop)
• 0805 Resistor 200Ω
• 0805 Resistor 320Ω
• 0805 Resistor 40kΩ
• 0805 Resistor 22kΩ
• 0805 Capacitor 4.7uF
• CR/LIR2450 Coin cell holder (20mm diameter, 5mm height)
• (optional) male pin header, jst pin header

Invensense’s bottom-ported MEMS digital microphones with an embedded ASIC which directly outputs 24-bit I2S serial data without the need of a CODEC. Enlarged sound port holes. Board is intended for echo location (sonar) using the Teensy 3.x or Edison microcontrollers.

Water rocket telemetry and flight control

10u169

Two LED blinky circuit for learning how to solder.