Research and Development: Components

Model, Description	Interfaces	Notes summary, refs	Links; Technical, Purchase	Cost + Shipping
Raspberry Pi A+ Single board computer	256Mb; 1-USB, 40 PIN GPIO 3Volt I2C, SPI, DI/DO, 2 PiCam, HDMI	No Ethernet, one USB, reduced power consumption	<a href="http://www.ebay.com/itm/381063458951">http://www.ebay.com Pi A+</a> New Egg Domestic	24.99 + free
Raspberry Pi B+ Single board computer	512Mb; 4-USB, RJ45, 40 PIN GPIO 3Volt I2C, SPI, DI/DO, 2-PiCam, HDMI	More memory, Ethernet, 4 USB, more power, larger	<a href="http://www.ebay.com/itm/301384040390">http://www.ebay.com Pi B+</a> New Egg Domestic	35.99 + .99
Micro SDHC 16 GB Memory	Micro SHDC	SanDisk 16GB Class 10 Mobile Ultra micro SD SDHC 48MB/s UHS Memory Card, formatted NTFS, For A+,B+ tested	<a href="http://www.ebay.com/itm/191301826382">http://www.ebay.com Micro 16gb SHDC</a> retail package, domestic	$9.36 + $1.99
A/D Boards (for load cells)
HX711; 24 bit A/D, for load cells (summed sensors)	Serial	Original single chip 24 bit A/D, working with Pi, cable length imitations	<a href="http://www.ebay.com/itm/Weighing-Sensor-AD-Module-Dual-channel-24-bit-A-D-Conversion-HX711-Shieding-New-/161264280794?pt=LH_DefaultDomain_0&hash=item258c19a4da">http://www.ebay.com HX711-Shieding</a>	$3.58 + $1.98
HX711; 24 bit A/D, for load cells (summed sensors)	Serial	New board design with extra chip, buffered?, programmable, untested	<a href="http://www.ebay.com/itm/HX711-Dual-channel-24-bit-A-D-Conversion-Weighing-Sensor-Module-Metal-Shied/281410718606">http://www.ebay.com HX711-Dual-channel module</a>	$3.01 + $1.99
Phidgets #1046 Bridge, load cell USB board, 4 readings	USB	24 Bit Quad A/D load cell dev board. programmable, Pi tested, SW summed	<a href="http://www.phidgets.com/products.php?product_id=1046">http://www.phidgets.com 1046 bridge PCB</a>	$90.00 + $12.00
Temperature
SHT21/AM2321 Digital Temperature and Humidity	I2C Bus	Small package, 2C, 5% RH accy, 16 bit A/D, untested, pull-up likely reqd.	<a href="http://www.ebay.com/itm/200957392012">http://www.ebay AM2321</a>	$4.55 + $1.98
PC Sensors TemperHum; Temperature & Humidity	USB	Proven on Pi with USB hub, .5C, ± 4.5 RH% accy, Some versions may be problematic. Difficult returns to China.	<a href="http://www.ebay.com/itm/PCsensor-USB-Hygrometer-Thermometer-TEMPerHUM-track-Hot-sell-D3171D-/171074099070?pt=US_USB_Wi_Fi_Adapters_Dongles&hash=item27d4cf977e">http://www.ebay.comTemperHum</a>	$22.99 + free
DHT22/AM2302 Digital Temperature and Humidity By ASONG	I2C Bus	Small package, .5C, 2% RH accy, 10k Ohm pull-up resistor required, verified operation with Pi.	<a href="http://www.ebay.com/itm/DHT22-AM2302-Digital-Temperature-And-Humidity-Sensor-Replace-SHT11-SHT15-Arduino-/170931111400?pt=LH_DefaultDomain_0&hash=item27cc49c5e8">http://www.ebay.com/itm/DHT22-AM2302</a>	$3.53 + $1.98
DHT21/AM2301 Digital Temperature & Humidity	I2C Bus	Larger package, field ready with pigtail, .5C, 3% RH accy.	<a href="http://www.ebay.com/itm/DHT21-AM2301-Digital-Temperature-Humidity-Sensor-module-SHT11-SHT15-Arduino-/181007963977?pt=LH_DefaultDomain_0&hash=item2a24ea5749&tfrom=170931519350">http://www.ebay DHT21</a>	3.47 + $1.98
Luminosity
TSL2591 Luminosity PCB	I2C Bus	IR & Visible 188 uLux – 88k Lux, 3V, Wide Dynamic Range 16 bit, 600M:1 range, Adafruit board, non-addressable	<a href="https://www.adafruit.com/product/1980">https://www.adafruit TSL2591</a> <a href="https://www.adafruit.com/products/1980"> </a>	$6.95 + $4.00 from UK
TSL2561 Luminosity PCB	I2C Bus	IR & Visible 0.1 – 40+ k Lux, 3V 0.6 mA, non-addressable, limited Lux high end range, untested	<a href="http://www.ebay.com/itm/271576254175">http://www.ebay TSL2561 Luminosity sensor</a>	$5.04 + free ship
BH1750FVI Luminosity PCB	I2C Bus	IR & Visible ~1 – 65 k Lux, 3V 0.6 mA, non-addressable, 16 bit A/D, addressable untested	<a href="http://www.ebay.com/itm/140810083567">http://www.ebay.com BH1750FVI Light Intensity Sensor</a>	$2.27 + $1.80
Omnivision 5647, LS40136 lens	15 Pin MIPI CSI (15 cm ribbon)	5 megapixels, 2592X1944, 1080P, IR filtered. Designed for Pi. Removabl lens	<a href="http://www.ebay.com/itm/281212352673">http://www.ebay.com Pi Camera with M12X.5 mount lens</a>	16.98 + Free
Cables \ Connectors
Flex Cable for Pi Cameras	15 Pin MIPI CSI (61 cm ribbon)	24” ribbon cable for Pi cameras	<a href="http://www.ebay.com/itm/251749299931">http://www.ebay.com 24" Flex cable for Pi cam</a>	$7.99 + Free
Flex Cable for Pi Cameras	15 Pin MIPI CSI (300-600 cm ribbon)	36-72” ribbon cable for Pi cameras	<a href="http://www.adafruit.com/products/2144?gclid=CLuX28jQ1sICFY-VfgodclQAmA">http://www.adafruit.com Pi Camera Cable 36-72"</a>	$3.95-$5.95 <a name="_GoBack"></a>~$4.00 ship
40 pin Straight Extension Board	40 GPIO	40 pin Straight Type Extension Board for Raspberry PI Type B+ and A+	<a href="http://www.ebay.com/itm/291228673142">http://www.ebay.com 40 Pin extension board for A+ B+</a>	$3.59 + free
40 pin T Extension Board with cable and proto board	40 GPIO	40 pin T Type Extension Board & cable for Raspberry PI Type B+ and A+	<a href="http://www.ebay.com/itm/181611122365">http://www.ebay.com Tee extension boad</a>	$9.99 + free
Solar & Power
Renogy 30W Monocrystalline Solar Panel	Insulated Two Conductor Wire	30 Watt Monocrystalline Solar Panel, 12 Volt 1.7A, Dimensions:13.5X23.8X1”	<a href="http://www.ebay.com/itm/30W-Watts-30-Watt-Mono-Solar-Panel-Off-Grid-12-Volt-12V-RV-Boat-Battery-Charger/301410352856">http://www.ebay.com 30 Watt solar Panel</a> ships from USA	$50.99 + free
25 Watt Solar Panel No: PWM-25W	Insulated Two Conductor Wire	Watts Peaks(Pm): 25W, 12V (Imp): 1.33A Dimensions:530x280x25mm	<a href="http://www.ebay.com/itm/25W-Watt-Mono-Solar-Panel-Off-Grid-22-64V-RV-Boat-Battery-Charger/281502149817">http://www.ebay.com 25 Watt Solar Panel</a> ships from USA	$35 + $10