Shared Projects

Color Matching Sensor Board

Color Matching, Make a ’T', 6 Blocks in a Box

Shifting Squares - 20 inductive sensors Tricky Triangles - 16 inductive sensors

Breakout board with two independently addressable ST Microelectronics' 2 Mbit (256 kbyte) M24M02-DRC I2C EEPROMs designed to be mounted onto the Teensy 3.1 and use digitalWrite for power and ground due to the very low-power (< 2 mA per EEPROM) requirements. Can also be used as a traditional breakout board since VIN ranges from 1.8 to 5.5 V. Cutting one or both traces between the solder jumpers enables write protect mode allowing access to the data already written but disallowing further write operations. The write protect is reversible by simply soldering the junction again. Operating temperature range is -40 C to +85 C making this an ideal solution for portable/remote data logging when power and space are at a premium. EEPROM write operational for 4 million write cycles and data is retained for 200 years! Minimized width to make it even more appallingly small! Fixed trace error!

LED PWM Fire Effect using ATtiny84A

www.lemon64.com Luma Fix for c64 svideo

Display

See my project on GitHub for details and latest changes.

ICSP Adapter V1.0

This little board adapts a standard 2x3 pin AVR programming header to an ATTiny chip in a breadboard.

• Super slim, won’t block breadboard, ISP header hangs off breadboard
• Pin number labels
• Pin function labels
• Optional SMD resonator for a clock source

Nanoscopic breakout board for MPU9250 motion sensor hardwired for I2C and ADO=1 to serve as auxiliary motion sensor to support more conventional Mini and/or Micro add-on boards when one MPU9250 just isn’t enough. I2C pullup resistors can be added if they are the only ones in the circuit; usually these will be unoccupied.

Inifinite Noise true random number generator with pads for soldering USB pins to the board. Buy the pins from Jameco, part #230965

ST Microelectronic’s ultra-low-power real time clock coupled with Measurement Specialties MS5637 pressure and temperature sensor and ST’s M2402DFC 2Mbit EEPROM in an appallingly small add-on board for Teensy 3.1. Power is supplied via digital write to general GPIO pins since the total power requirement never exceeds 2 mA. Communication is via I2C and there are 4K7 pullup resistors on board. The temperature sensor allows the Teensy 3.1 microcontroller to make periodic calibration updates to the RTC calibration register so the clock remains temperature compensated for maximum (~2 ppm or 1 minute a year) accuracy. The clock outputs the usual date, days, hours, minutes, etc. but also outputs tenths of seconds as well as hundredths of a second.The on-board EEPROM is useful for data logging and storing alarm patterns (music) for output to a small speaker. With 2 Mbits (256 kBytes), lots of data can be logged and dozens of alarm sounds can be stored; one for every occasion! Added Taiyo Yuden PAS3225 2.6V 14 mF super capacitor and 1N4148 diode to provide power to the RTC time keeper even when disconnected from the microcontroller. The PAS3225 5 microAhour super cap can run the RTC (which needs ~330 nA at 2.6 V) for about 15 hours. Added ST Microelectronics' HTS221 16-bit, ultra-low-power relative humidity sensor. The board is now a tiny weather logging station: pressure, temperature, and humidity can be logged once per minute for 15 days!

BMX-055 9-axis motion sensor and MS5637 pressure sensor add-on for teensy 3.1 with hardwired I2C. Added solder jumpers on back of board so 3V3 and GND can be taken from the board edge for better breadboard use.

ATtiny [2,4,8]4 micro + ESP8266 Wifi. All I/O 5V tolerant. About the size of an AA battery (with a socket on the back). AtTiny can shut down the power rails to the ESP8266 completely for ultra-low power consumption

74AC04 buffer for Jackson Labs LTE-Lite

Based on Said Jackson’s suggested design described on the time-nuts email list.

Built board

Schematic

Apologies for poor silk screen; parts libraries need work.

C1-4: 0.1uF 1206 X7R

C5: 0.01uF 1206 X7R

C6: 10uF 35V Tantalum (< 3 ohms ESR, +ve to the right, e.g. Kemet T491D106M035AT)

C7: 1uF 1206 X7R or Tantalum (+ve to the left, e.g. Kemet T491A105K035AT )

D1: RS1B-E3 or similar

IC1: 74AC04 SOIC

IC2: LT1763CS8-3.3 (pin 1 top left)

X1-4: SMA-F end launch or solder coax directly.

J1: 2-pin header

R1-6: 100 1206

R7: 1M 1206

MMBT5179 HF amplifier

cpu replacement for kinesis keyboard

breakout board for bidirectional level shifter