STM32L4 Sensor Tile

From Kris Winer on Hackaday.io:

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STM32L4 Sensor Tile

Small, connected device for smelling and hearing in any environment.

This is a 20 mm x 20 mm four-layer pcb tile full of interesting sensors (ICS43434 I2S Digital Microphone, MPU6500 acclerometer/gyro, BME280 pressure/temperature/humidity, and CCS811 air quality) with a Rigado BMD-350 UART BLE bridge for sending data to a smart phone all managed by a STM32L432 host MCU.

The STM32L432 is programmed using the Arduino IDE via the USB connector and serial data can be displayed on the serial monitor to verify performance and proper function, etc. But it is intended to be powered by a small 150 mAH LiPo battery for wireless sensing applications. The STM32L4 is a very low power MCU and with proper sensor and radio management it is possible to get the average power usage down to the ~100uA level, meaning a 150 mAH LiPo battery can run the device for two months on a charge.

A library for it is available on GitHub:

kriswiner/SensorTile

A collection of sketches to run the STM32L432-based (20 mm x 20 mm) sensor tile with an MPU6500 accel/gyro, ICS43434 I2S digital microphone, BME280 temperature/pressure/humidity sensor, and CCS811 air quality sensor. The sensor tile has an on-board MAX1555 LiPo battery charger, an on/off switch, and a Rigado BMD-350 nRF52 BLE module.

 

 

 

STM32L4 Sensor Tile

Automated Pool Controller

Jerad Jacob designed this board to monitor and control a swimming pool:

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Here-Be-Dragons/Pool-Controller

Cloud-based pump speed, solar collector controls, and temperature monitoring for your pool with SmartThings and Alexa integration

Timer Control of a Hayward Tristar VS Pump and Hayward GL-235 Solar Pool Controller

Tristar_VS_Relay_Wiring

osmosis has shared the project on OSH Park:

Pool Controller v2.2

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Order from OSH Park

Automated Pool Controller

Tindie Seller Interview: Alex Albino

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interviewed Alex Albino of Femtoduino for the Tindie blog:

Alex Albino, of the Femtoduino Store, is one of the original sellers on Tindie, with his store officially listed as opening on November 26, 2012. During this time, he’s sold well over 300 of his custom boards, and I was glad to catch up to him to ask a few questions.

Albino, who works as a software and web developer, first got into electronics after his NES was fried in a thunderstorm in junior high, and he got to take it apart. Eventually his interests led him to the Arduino and Fabio Varesano’s work, and multiple hardware platforms over the years.

Albino’s store started with him asking Fabio Varesano if he could sell Femtoduino boards, which have the same outputs as an Arduino Uno in the size of one’s thumb. Since Varesano wasn’t interested in selling them himself, he generously gave Albino permission to run with this design. Albino then went to work assembling and selling these boards, and even made sure to give a portion of the money he made—though he didn’t have to—back to Varesano to promote his open source work.

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Of course, these tiny Arduino clones are still for sale, but Albino sells several other items, including the FemtoBeacon wireless IMU (inertial measurement unit) sensor. He even notes his store theme as providing the smallest open source IMU sensors in the world. You can see one in the image above next to a U.S. dime—quite small indeed. He hopes to grow the Femtobeacon business into a full-time job in the future.

Naturally, Albino has bought from other Tindarians in the past, which he says is always fun. He also notes that, “If you sell anything on Tindie, make sure to package carefully, take decent photos, and include videos of stuff in action!” As such, here’s a video of the tiny Femtoduino in action:

Tindie Seller Interview: Alex Albino

Using Si7006 to read temperature and humidity

From the bitknitting blog:

cropped-lightbulbthing221

Using the Si7006 to get temperature and humidity readings

I made a PCB with the Si7006 on it. This post is my bumblings encountered as I successfully got temperature and humidity readings from a Si7006 using the PCB I designed. In summary, the Si7006 is easy to work with. It is relatively easy to solder and very easy to access via I2C […]

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The design files and source code are available on GitHub:

github-smallBitKnitting/TheLeafSpa

 

Using Si7006 to read temperature and humidity

Biomed Shield for Arduino 101

From Orlando Hoilett of Calvary Engineering on Hackaday.io:

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Biomed Shield for Arduino 101

A sweet Arduino shield with a ton of cool sensors for physiological parameters such as heart rate and breathing rate

The features include:

  • Heart Rate Monitoring with the MAX30101
  • Pulse Oximeter with the MAX30101
  • Electrocardiogram, Electromyogram, and Electrooculogram with our Super Simple EXG Circuit
  • Bioimpedance with the AD5934
  • Body Temperature with the MLX90614
  • Ambient Light with a CdS Photocell
  • Ambient Temperature with a Thermistor

The design files and source code are available on GitHub:

github-smallCalvEngIO/BiomedShield

Biomed Shield for Arduino 101

How to Design a Cheap Plant Watering Sensor

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This is the third part of the meta-tutorial, where I talk about designing a cheap plant watering sensor. If you did not already read the first and second part, please do it now. These parts contain a lot information which lead to this point of the tutorial. The second part ended with step 14, designing a first prototype PCB.

via How to Design a Cheap Plant Watering Sensor (Part 3) — Lucky Resistor

How to Design a Cheap Plant Watering Sensor

Comprehensive Respiratory Health Monitor

279361444154700437.jpgDean Gouramanis is building a wearable Bluetooth-enabled Arduino Pulse Oximeter:

Comprehensive Respiratory Health Monitor

bluetooth-enabled wearable device can measure Pulse Oximetry, and ambient CO2 24/7

The board is shared on GitHub:

images11 dgouramanis/CRHM

Comprehensive Respiratory Health Monitor