Wireless Sensors for Arduino and the IOT

[DedeHai]

Greetings everyone

at the first mini Maker Faire in Zürich, Switzerland I introduced my project 'Lambda Nodes' and I was surprised on the attention it got.
The project is small wireless sensors based on NRF24L01 transceiver modules with the goal to be small, easy to use, low cost and open source. To my knowledge there is no such thing yet: either the sensors are expensive, bulky or closed source.

I recently made a simple introduction website on wordpress. So if this sounds interesting please check it out: https://lambdanodes.wordpress.com/

The project is in an advanced state, all the hardware is working and the software is almost bug-free. The usability still needs to be improved a little but it is almost plug&play.
I am hoping to get some more in-depth feedback here on the forum. Yes, this is my first post  Long time EEVblog viewer though. Oh and sorry the project is not yet open source, it will be as soon as I get around to actually start crowd-funding for having them manufactured at Seeedstudio.

Here are some specs of the advanced prototypes:

• Radio frequency: 2.4GHz
• Transmission range: up to 70m
• Battery: CR2032
• Battery life: up to 3 years

Theta Node (Temperature)

• Size: 43x22x9mm (LxWxH)
• Accuracy: ±0.5°C
• Resolution: 0.02°C
• Sensor: precision NTC
• Range: -20°C to 80°C (up to 250°C with external NTC)

Epsilon Node (Soil Moisture probe)

• Size: 100x22x9mm (LxWxH)
• Resolution: 0.1% (0% is dry, 100% is fully wet)
• Sensor: capacitive probe

Kappa Node (environment sensor)

• Size: 43x22x9mm (LxWxH)
• Sensor: BME280
• Measures temperature, humidity and pressure

Alpha Node (receiver station)

• Size: 50x50x12mm (LxWxH)
• Uses ESP8266 for WiFi
• SD card for local data-logging
• Contains configuration web-page

The receiver station is of course optional, it also works with any hardware that can interface to an NRF24L01 (Arduino, Raspberry, ...).


My table at the mini Maker Faire in Zürich