The premise of my Azure Meetup presentation was could you build an interesting project on a rainy weekend afternoon with a constrained budget (tank of 91 octane petrol) and minimal soldering .
Our family car is a VW Passat V6 4Motion which has a 62 Litre tank. The driver usually doesn’t usually stop to fill up until the fuel light has been on for a bit which helped.
Based on the most recent receipt the budget was NZD132.
Where possible I purchased parts locally (the tech equivalent of food miles) or on special.
My bill of materials (prices as at 2018-06) was on budget.
- Raspberry PI 3 Model B NZD55.20 (I walked down and collected this so no freight)
- Samsung EVO PLUS 32 GB MicroSD NZD 14.50 (On special, collected)
- Raspberry PI to nRF24L01+ Shield USD9.90 NZD14.18 (posted from Slovenia)
- nRf24L01 Long range wireless module USD 4.50 NZD25.49
- devDuino V2.2 USD17.99 NZD52.93
The devDuino V2.2 and nRF24L01 module were USD26.20 approx. NZD37.50 (including freight) from elecrow.
I powered my Raspberry PI with a spare cellphone charger (make sure it can supply enough current to reliably power the device).
The devDuino V2.has an ATSHA204A which provides a guaranteed unique 72-bit serial number (makes it harder to screw up provisioning devices in the field).
I use a 32G MicroSD rather than a 16G MicroSD card as I have had issued with 16G cards getting corrupted by more recent upgrades (possibly running out of space?)
The Raspberry PI shield requires a simple modification to enable interrupt driven operation.
AdaFruit.IO has free and USD10.00/month options which work well for many hobbyist projects.