@d00m We’ve been able to run a simplified version of the loraWan stack from an ATtiny85 in combination with the RFM95. (deep) sleep current is less than 1 uA.
So if you use a 1200 mAhr lithium thionyl chloride battery (size 1/2 AA), you can keep the device in sleep mode for about 50 years!
(actually it’s over 100 years but the battery loses 1% energy per year)
@Loraloralora I was at an IoT-seminar last month where Samir Hennaoui, Senior Product Engineer at Murata Electronics, presented this product and mentioned this price.
This is a version of the above node except made with a pcb shield to do the wiring. I’ve currently set it up on the kpn IOT network in order to test the triangulation geolocation. It’s sending out a packet every 5 minutes and I’m logging all the responses. I expect that it will run between 6 months and a year which is what the test is all about.
Great to see that posting project & pictures actually inspires people to make the IoT evolve. Great work!
A picture of my LoRaWAN project from last year with a more powerful microcontroller:
More info and specs here; the LoRaWAN Node’s (hardware) are still available for those interested!
Now only some nanoTrackers for software development. Possible make batch. A very specific device. Mainly for observing wild animals. Try ask RAKWireless for production
Now are close - because for customer. Consulting about open source.
In principle, there is nothing complicated there.
The sensors are written. GPS is also named. RAK4200 from RAK.
May be RAK can make for sale or other.
OK, If you go for “VERY SMALL” the RAK4200 seems perfect to me ( no experience with it yet ). But it’s not cheaper as the Arduino Pro Mini/ESP32-WROOM + RFM95 ( 8.49 <-> 1.80 + 3.74 ). I am still very satisfied with my Sandwich Concept
All resources are open and free, the world is my customer.
Heltec CubeCell HTCC-AB02A Includes SMA antenna connector and 1/2 AA battery holder for use with 14250 primary Lithium batteries (Lithium Thionyl Chloride, non-rechargeable)
Size: 56.6 x 24 x 21.5 mm
These are ARM Cortex based with SX1262 and work with the Arduino framework.
Maybe we have to setup a node/development board database with the primary properties (dimensions, supported functions, supported ide, power consumption, vendor/project link). I see passing very interesting possibilities. We (and novices) can learn a lot of all those possibilities for specific applications.