Regarding hardware, we used two independent but similar configurations. Our first test case used the DHT22 sensor and secondly we used the SDI-12 pressure transducer. Assembling the system hardware was relatively simple, requiring minimal soldering and very few tools (i.e. drill, soldering iron, solder, pin-wire connector, male-to-male jumpers). All of the parts were purchased online and are listed, excluding sensors, along with their prices and online purchasing locations in Table 1. Table 2 lists the same information for the two sensors we used.
Individual item costs, purchasing locations, and total cost of hardware for logging, transmission, case, and solar power
Item (where to purchase) . | Cost . |
---|---|
Arduino Uno (www.amazon.com/Arduino-UNO-board-DIP-ATmega328P/dp/B006H06TVG) | $16 |
SIMCOM SIM900 Quad-band GSM GPRS Shield (www.ebay.com/itm/like/151121095914?lpid=82) | $35 |
Miniature breadboard (www.sparkfun.com/products/12045) | $4 |
SIM card and phone plan (www.ptel.com/phones) | $15 |
MicroSD Card (www.amazon.com/b?node=3015433011) | $10 |
Voltaic 6W Solar Panel and 4,000 mAh Battery (www.voltaicsystems.com/6-watt-kit) | $90 |
Pelican 1050 Clear Micro Case (www.bhphotovideo.com/bnh/controller/home?O=&sku=257883&gclid=CjwKEAiAj) | $15 |
Total cost | $181 |
Item (where to purchase) . | Cost . |
---|---|
Arduino Uno (www.amazon.com/Arduino-UNO-board-DIP-ATmega328P/dp/B006H06TVG) | $16 |
SIMCOM SIM900 Quad-band GSM GPRS Shield (www.ebay.com/itm/like/151121095914?lpid=82) | $35 |
Miniature breadboard (www.sparkfun.com/products/12045) | $4 |
SIM card and phone plan (www.ptel.com/phones) | $15 |
MicroSD Card (www.amazon.com/b?node=3015433011) | $10 |
Voltaic 6W Solar Panel and 4,000 mAh Battery (www.voltaicsystems.com/6-watt-kit) | $90 |
Pelican 1050 Clear Micro Case (www.bhphotovideo.com/bnh/controller/home?O=&sku=257883&gclid=CjwKEAiAj) | $15 |
Total cost | $181 |
Costs and online locations of sensors used
Item (where to purchase) . | Cost . |
---|---|
DHT22 Temperature and humidity sensor (www.sparkfun.com/products/10167) | $10 |
SDI-12 Pressure transducer (www.meas-spec.com/product/t_product.aspx?id=9023#) | ∼$700 |
Item (where to purchase) . | Cost . |
---|---|
DHT22 Temperature and humidity sensor (www.sparkfun.com/products/10167) | $10 |
SDI-12 Pressure transducer (www.meas-spec.com/product/t_product.aspx?id=9023#) | ∼$700 |