OSH Park
Shared projects
M41T62RTC+MS5637+M2402DFC+HTS221.v01y
by
PeskyProducts.
2
layer board of
0.71x0.31
inches
(17.93x7.75
mm).
Shared on
December 25th, 2014 17:29.
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!
BMX055MiniTeensyAddOn.v01x
by
PeskyProducts.
2
layer board of
0.71x0.51
inches
(17.93x12.83
mm).
Shared on
December 25th, 2014 00:30.
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.
WiFiOnAStick Rev XA
by
CogwheelCircuitworks.
2
layer board of
0.86x2.81
inches
(21.72x71.25
mm).
Shared on
December 24th, 2014 18:44.
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
KJ7HQ: LTE Lite Buffer
by
orin.
2
layer board of
1.57x1.66
inches
(39.93x42.04
mm).
Shared on
December 24th, 2014 07:51.
74AC04 buffer for Jackson Labs LTE-Lite
Based on Said Jackson’s suggested design described on the time-nuts email list.
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
Yezl ver. A
by
Bosses_Son.
2
layer board of
0.91x0.91
inches
(23.01x23.01
mm).
Shared on
December 23rd, 2014 23:07.
rotated for price reduction
Uses switch TL3330AF260QG