The items used in this guide are listed in the table below. Items listed as Stock were things I had in my parts bin. I included a link to a source if you don't have that part, or a substitute in your parts bin.
| Item | Quan | Source | Web page/description |
|---|---|---|---|
| Adafruit Trinket M0 | 1 | Adafruit # 3500 | https://www.adafruit.com/product/3500 |
| JST-PH 2-pin SMT right angle connector | 1 | Adafruit # 1769 | https://www.adafruit.com/product/1769 |
| JST-PH 2-pin cable - female connector | 1 | Adafruit # 261 | https://www.adafruit.com/product/261 |
| PIR (motion) sensor | 2 | Adafruit # 189 | https://www.adafruit.com/product/189 |
| Photo cell (CdS photoresistor) | 1 | Adafruit # 161 | https://www.adafruit.com/product/161 |
| 2.2KΩ Resistor† | 1 | Adafruit # 2782 | https://www.adafruit.com/product/2782 |
| 5V 4A Power supply* | 1 | Adafruit # 1466 | https://www.adafruit.com/product/1466 |
| USB to barrel connector cable | 1 | Adafruit # 2697 | https://www.adafruit.com/product/2697 |
| Panel mount 2.1mm DC barrel jack | 1 | Adafruit # 610 | https://www.adafruit.com/product/610 |
| 100µf 16V capacitor | 1 | Adafruit # 2193 | https://www.adafruit.com/product/2193 |
| Headers | 2x5 | Adafruit # 3002 | https://www.adafruit.com/product/3002 |
| 4-pin JST SM cable set | 2 | Adafruit # 578 | https://www.adafruit.com/product/578 |
| 5M 150 pixel RGB LED light strip | 1 | Amazon | IP67 version |
| Cable clips‡ | ~20 | Amazon | 15.5mmx12.5mm cable clips |
| Small SPST switch, panel mount | 1 | Amazon | SPST ON/OFF subminiature toggle switch |
| ABS plastic junction box§ | 1 | Amazon | 3.27"x2.28"x1.3" |
| Plastic project box (alternate) | 1 | Amazon | 83x58x35mm |
| Wire for wiring PIRs | 1 | Home Depot | 50 foot cable |
| PIR enclosure | 2 | Thingiverse | Get 2 printed |
| M3x19 screw | 2 | Stock | Assortment |
| M3 nut | 2 | Stock | Assortment |
| Shrink wrap tubing | 2 | Stock | Assortment |
| Wire | ~ | Stock | Something like this |
| Perf board | 4x8 | Stock | Something like this |
| Micro JST 2-pin connector pairs | 3 | Stock | For internal connections |
| M2x5 self tapping screw | 1 | Stock | Assortment |
| US #6x5/8" flat head wood screw | 6 | Stock | Example |
| Outdoor double sided mounting tape | 1 roll | Stock | Scotch version |
| E6000 adhesive^ | 1 tube | Amazon | Something like this |
†The 2.2KΩ resistor may not be the best choice for your installation. The voltage divider should be specified to get reasonable readings in the range of light for your installation. Be aware that each photoresistor has a different response to light and may require another value for the resistor in the voltage divider to work well in your installation. I ended up using a 3.3KΩ resistor (actually 3 10KΩ resistors in parallel since I had those available).
*In my setup only 2.4amps at 5V was required. Your situation may be different based on the number and type of LEDs in your strip.
‡These clips didn't really fit properly and had to be modified so that I could use them. You may want to choose an alternate. More details in the Building It section.
§This is the box that arrived with a big sticky label affixed to the transparent top. It took awhile, but I was eventually able to clean the top. The supplier said this issue would be addressed. I don't know if it has or not. There is another option listed on the line below which looks reasonable, although I didn't try to use it.
^Update: Mike at Adafruit support informs me that the E6000 adhesive will bond very well to the silicone casing. (Another great example of Adafruit support!) For some reason, I never stumbled across this product. E6000 adhesive is readily available from crafting stores like Michaels and AC Moore, and from Amazon.