Outdoor UV index sensor
Here are instructions for outdoor UV index and ambient light sensor.
Low cost solar radiation shield
The solar radiation shield is a low cost DIY device to protect temperature, relative humidity and other sensors from the weather, while shielding them from the sun for highest accuracy. Provided here are instructions and files. It require some CNC machinig, but then it could be assembled in minutes. It is made from plant pot saucers.
Multisensor LoRa interface module
A multisensor LoRa end device has been designed for connecting different sensors to LoRa network. It’s primary use can be LoRa weather station but is not limited only to enviromental applications.
Typical “weather” application is shown in image above: 1-LoRa sensor interface, 2-Particle sensor, 3-Sun shield with temperature and humidity sensors, 4-UV-index and illumination sensor, 5-solar panel for autonomous operation. Different sensors will be described separately. I hope this project could grow into different directions.
Continue reading ‘Multisensor LoRa interface module’ »What is inside smart watch?
Amazfit pace went swimming and drowned 🙂 After unsuccessful warranty claim I put watch in the drawer and forget about it because it looks “unopenable”. Today I learned it could be opened easily when heated. So I decided to try it. I grabbed hot air gun and shot few blows into the housing heating up to 80°C. It is just below 85°C, which could be a limit for some electronic components.
The proper tool to open the smart watch
The disasembly was piece of cake. Just separate the two pieces.
Toothbrush stand
I designed simple two pice toothbrush stand for 8 brushes. In our large family it is sometimes hard to track the toothbrushes only by color. I decided to put this issue in order by ordering the brushes with two simple 3D printed parts. Front one has magnets for removing from the shelf when needed due to cleaning.
Holder in place used in bathroom
Model files are in this file: STEP, PARASOLID and Solidworks
3D model with bathroom shelf
Two pieces for 3D printing
Two magnets (12mm dia, 2mm thick) are attached with epoxy into front holder. Add two more magnets and attach with epoxy to the uderside of the shelf as shown in the first picture.After curing/drying the holder can be removed and cleaned.
Rear holder is attached with two side self adhesive.
Grabcad project: https://grabcad.com/library/toothbrush-holder-8
Please share if you like the idea.
Preparing wine with IoT sensors
Every wine producer needs to know their temperature during fermentation. There are many small producers (like in our family) without high-end equipment for fermenting the grapes and must. We produce wine for our own use (around 1000 litres) and the technology relies mostly on experience and limited information about the fermentation process. One of the most important paramters is temperature or more specifically, the temperature profile (time dependance), its gradient and maximum value as well. In the past I connected simple I2C sensor to raspberry pi and sent data to mysql database via WiFi connection. It is shame to mention the power consumption of such thermometer.
Loradunchy module on top of the low cost solar cell
Recently, I placed LoRaWAN gateway at the top of the vineyard to cover all future need for connecting winegrowing sensors in all neighbouring vineyards. The r.pi thermometer was upgraded to LoRa and I used my own design, the LoRaDunchy module with small LiPo battery, TMP75 as sensor element and small solar cell for supplying the power. Solar power is somehow overkill for this application, but I want to check the real life solar powered sensor. It would be good experience for future sensors which I intend to place in the field for monitoring the microclimatic conditions (and possible prediction of the vine diseases).
LoraDunchy Connection diagram for thermometer application
Particle Sensor with LoRa
Two PCBs from earlier projects were used in this project:
- LoRa breakout board
- Sensor PCB with Si7013 humidity sensor from multisensor LoRa project
- … and particle sensor.
Finished particle sensor in housing, ready for the TTN
Small “rubber-ducky” helical antenna for 868MHz
This simple Helical Antenna can be used for most LoRa (and other small wireless device) applications, where space constraints exist. The construction is simple, made from wound solid Ag plated copper wire taken from piece of coaxial cable.
Helical axial antenna for 868MHz
Two options how to use this antenna on the PCB modules
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LoraDunchy Arduino Nano pin-compatibile LoRa module with power management
Lora board with Arduino nano compatibile pinout and simple battery management
Small board with arduino nano compatibile pinout with power management and Murata ABZ LoRa module with STM32L0 microcontroller
Features
- LoRa module: Murata ABZ
- Single cell LiPo cell charger on-board with charging signal internally connected to PA11 (via jumper)
- Buck/Boost switching power supply for delivering stable 3,3V regardless of the batterz voltage
- Battery fuel gauge on-board to control the real status of the battery
Schematic diagram
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