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Environmental Data Logger v.03
by
PeskyProducts.
2
layer board of
0.71x0.31
inches
(17.91x7.75
mm).
Shared on
June 4th, 2015 08:05.
ST Microelectronic’s ultra-low-power real time clock coupled with Bosch’s BME280 pressure, humidity, 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 Comchip low forward voltage Schottky 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 18 hours. The board is now a tiny weather logging station: pressure, temperature, and humidity can be logged once per minute for 15 days! Changed IRQ so pullup voltage provided on RTC side of the diode.
MPU6500+AK8963C+BMP280+EM7180SENtral.Teensy.Shield.v01
by
PeskyProducts.
2
layer board of
0.71x0.51
inches
(17.91x12.83
mm).
Shared on
June 1st, 2015 04:53.
MPU6500 6-axis motion sensor plus AK8963C magnetometer plus BMP280 pressure sensor with the SENtral EM7180 sensor fusion hub with M24512DFC EEPROM to store the SENtral configuration file. SENtral takes 9-axis accel/gyro/mag data from MPU6500 and AK8963C and performs hardware sensor fusion returning raw data, quaternions, linear acceleration, and heading, etc. Breakout board using the SENtral with jumpers to take power from edge pins for breadboard use or to mount directly on the Teensy 3.1 for comparison between open-source software sensor fusion and the hardware sensor fusion provided by the SENtral. SENtral can act as master to BMP280 pressure sensor and in the future include the pressure data in the sensor fusion.
nRf24L01+.v02yy.t3
by
PeskyProducts.
2
layer board of
0.71x0.70
inches
(17.96x17.75
mm).
Shared on
May 27th, 2015 19:29.
Nordic Semiconductor’s low-power 2.4 GHz RF radio with pcb antenna and matching circuit per Nordic’s spec. Using much smaller XRCHA16MHz Murata crystal to reduce cost and board size. Added solder jumpers on back to allow 3V3 and GND to be taken from board edge to make breadboard friendly.
MotionActivatedBlackoutLight.v01
by
PeskyProducts.
2
layer board of
0.87x0.82
inches
(21.97x20.83
mm).
Shared on
May 23rd, 2015 08:30.
D203S PIR signal processed by BISS0001 active only when photoresistor detects dark ambient conditions. PIR detection triggers 2600 mcd white led with 160 degree illumination for a time settable by a Murata potentiometer. Slide switch chooses between retrigger modes. In addition to the usual motion-activated illumination, the trigger signal from the BISS0001 is pinned out to the side of the board so other actions can be triggered such as camera control, relays, etc. Intended to be attached to a 9V battery for a compact motion controlled solution with the TI TPS714XX voltage regulator providing either 3V3 (here) or 5 V depending on the application.
ESP8266TeensyAdd-On.v02
by
PeskyProducts.
2
layer board of
0.71x0.86
inches
(17.96x21.74
mm).
Shared on
May 21st, 2015 08:50.
Simple breakout board for the ESP8266 chip to provide wifi capability to the Teensy 3.1. Designed to take power from VIN via USB or LiPo battery and convert to 3V3 with a TLV7333 300 mA voltage regulator. Also on board is a Macronix 4 Mbit MX254006E SPI Flash memory chip. Small rgb led indicates power on, pcb antenna matched to 2.4 GHz. Can use either 26 or 40 MHz Seiko Epson crystal. The board has the same eight pins as the cheap Chinese modules as a first cut to see how hard it is to add wifi to Teensy 3.1 projects. The board is designed to solder directly on top of the Teensy just above the USB plug. Added led on TX, broke out five more GPIO pins including SPI port.