Small Sensor Box
Original CGI DocumentSmall sensor boxes contain a low-cost MQ131 ozone sensor, as well as a DHT11 air temperature and relative humidity sensor. There will be 175 small sensor boxes.
Bill of materials
| Part | Quantity | Source | Status | Date received | Notes |
|---|---|---|---|---|---|
| PCB Related stuff | |||||
| PCB | 1 | Vendor setup | Est. Nov. 10 | still a work in progress | |
| MQ131 | 1 | http://www.sainsmart.com/sainsmart-mq131-gas-sensor-ozone-module-for-arduino-uno-mega2560-r3-raspberry-pi.html | New vendor account FT17-030598 submitted Sept. 10 | ??? | budget ozone sensor |
| DHT11 | 1 | http://www.robotshop.com/en/electronic-brick-humidity-temperature-sensor.html | SR17-000936 | ??? | Cheap temperature/humidity |
| MCP3002 | 1 | https://www.sparkfun.com/products/8636 | PR17003933 sent to vendor 9/20; 51 out of 179 received 10/10, remaining 128 on b/o 13 weeks | Jan. 4 delivery of remaining 128 | Analog to Digital Converter |
| 10K resistor | 1 | http://www.mouser.com/ProductDetail/KOA-Speer/MFS1-4DCT52R1002F | ??? | one per ozone sensor + 4 per I2C ADC | |
| 20K resistor | 1 | http://www.mouser.com/ProductDetail/KOA-Speer/MFS1-4DCT52R2002F | ??? | one per ozone sensor | |
| 5V fan | 1 | http://www.jameco.com/z/AD0405MX-G76-LF-ADDA-Corporation-Fan-5V-DC-5-7-CFM-40x40x10-110mA-Hypro-Bearings-3-11-Leads-Speed-Sensor-_2131928.html | SR17-000936 submitted 10/12 | ??? | small airflow fan |
| GPIO Header | 1 | https://www.sparkfun.com/products/14017 | Submitted PR17-003963 on 9/15 | ??? | |
| Raspberry Pi | 1 | https://www.arrow.com/en/products/raspberrypi3/raspberry-pi-foundation | Submitted PR17-003963 on 9/15 | ??? | Raspberry Pi 3 Model B |
| SD Card | 1 | https://www.adorama.com/kgsdhc8gc4n.html | Submitted PR17-003963 on 9/15 | ??? | 8 gigs, class 4 |
| Power | |||||
| 5V POE receiver | 1 | https://www.amazon.com/UCTRONICS-802-3af-Splitter-Ethernet-Raspberry/dp/B01MDLUSE7/ | RFQ submitted 10/11 | ??? | either this |
| 5V power outlet | 1 | https://www.digikey.com/product-detail/en/triad-magnetics/WSU050-3000/237-1387-ND/3094913 | RFQ submitted 10/11 | ??? | or this |
| Box | |||||
| WP-33 Box | 1 | https://www.polycase.com/wp-33 | Received? | small case | |
| Mounting stuff to case | |||||
| zip ties - Rasp Pi | 1 | hold pi to PCB; might need 2 or 3 depending on size of zip tie | |||
| PCB mounting screw | 3 | Ordered with Polycase order? | Received? | mounting screws from polycase | |
| mounting base | 1 | https://www.lowes.com/pd/Utilitech-10-Pack-1-in-Nylon-Cable-Ties/50005766 | for attaching PoE to case | ||
| zip ties - PoE | 1 | to hold PoE to mounting base; tightened by installer at deployment time | |||
| zip ties - fan | 2 | hold fan to case | |||
| Mounting box to post | |||||
| bolt | 4 | https://www.grainger.com/product/FABORY-Tap-Bolt-41UG59?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/25CL06_AS01?$smthumb$ | PR17-003938 submitted 9/15 | Received? | Stainless Steel 1/4" x 1" bolt |
| lock washer | 4 | https://www.grainger.com/product/GRAINGER-APPROVED-Split-Lock-Washer-6DYU9?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/1JY98_AS01?$smthumb$ | PR17-003938 submitted 9/15 | Received? | zinc - safe inside box; cheaper zinc alternative: https://www.grainger.com/product/FABORY-Tap-Bolt-41UC68?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/25CL06_AS01?$smthumb$ |
| fender washer | 8 | https://www.grainger.com/product/FABORY-1-4-x1-O-D-22UE85 | PR17-003938 submitted 9/15 | Received? | Stainless Steel |
| nut | 4 | https://www.grainger.com/product/FABORY-1-4-20-Hex-Nut-22UK70 | PR17-003938 submitted 9/15 | Received? | Stainless Steel |
| aluminum piece | 2 | ||||
| locknut | 4 | https://www.grainger.com/product/FABORY-1-4-20-Nylon-Insert-Lock-Nut-22RV96 | PR17-003938 submitted 9/15 | Received? | stainless steel |