Reference Parts List

Below is the reference list of parts required to build a standalone PikaReader. Prices are accurate as of May 2026 and subject to change without notice.

Case:  

• Packout Case | $37 | https://www.homedepot.com/p/Milwaukee-PACKOUT-5-Compartments-Small-Parts-Organizer-48-22-8435/303005752

Power:

• Battery (160Wh) | $60 | https://www.amazon.com/dp/B0FX8KFSSG
• Voltmeter (INA237) | $10 | https://www.adafruit.com/product/6340
• Cable for INA237 | $2 | https://www.adafruit.com/product/5385
• POE+ Injector | $22 | https://www.amazon.com/dp/B0CRVQ4GZ1/
• 2.1 / 5mm connector | $2 | https://www.adafruit.com/product/369
• 5v Step Down transformer: EA50-5V | $7 | https://www.amazon.com/dp/B09VY3WQ93

Raspberry Pi (4b w/ 1G):

• Raspberry PI 4b (1g) | $35 | https://www.pishop.us/product/raspberry-pi-4-model-b-1gb/
• SD Card | $27 | https://www.bhphotovideo.com/c/product/1987067-REG/sandisk_sdsqqnr_064g_gn6ia_64gb_high_endurance_microsdhc.html
• Passive Cooling Case | $12 | https://www.amazon.com/dp/B07VD568FB
• Pi Case | $7 | https://www.amazon.com/gp/product/B074T7D1V5/

RTC and GPS Module for TimeSync:

• GPS Hat | $30 | https://www.adafruit.com/product/2324
• GPIO Stacking Header | $3 | https://www.adafruit.com/product/2223
• Optional: 28db GPS Antenna| $8 | https://www.amazon.com/dp/B0C3H6BKHC
• DS3231 Based TCXO RTC | $15 | https://www.adafruit.com/product/4282

2nd NIC for dedicated link to the RFID Reader:

• USB Ethernet | $12 | https://www.amazon.com/dp/B00MYTSN18

NOTICE: USB3 based adapters will jam the GPS signal. Ensure the adapter works with USB-2 ports and connect the adapter to the USB-2 ports on the Raspberry PI (not the blue ones)

Buttons and Switches:

• On/Off Switch | $5 | https://www.adafruit.com/product/916
• LED Momentary Switch | $5 | https://www.adafruit.com/product/560
• Yellow Momentary Switch | $1 | https://www.adafruit.com/product/1502

20x4 LCD:

• 20x4 LCD | $10 | https://www.amazon.com/SunFounder-Interface-Backlight-Compatible-Raspberry/dp/B0CLGVYPYW?th=1
• Jumper | $2 | https://www.adafruit.com/product/3950

Cooling:  

• 60mm Fan | $17 | https://www.amazon.com/gp/product/B01K4HVBBU/
• Fan Filter (x2) | $6 | https://www.coolerguys.com/collections/60mm-grills-filters/products/60mm-aluminum-fan-filter-black
• Fan Guard | $1 | https://www.coolerguys.com/products/60mm-black-finger-grill-fan-guard

Network Cables:

• RJ-45 Panel Mount | $5 | https://www.amazon.com/dp/B09WM63PGR
• 6in Patch Cables (3) | $5 | https://www.amazon.com/dp/B0FR8WP2J5

Miscellaneous:

• 22 guage wire | $11 | https://www.amazon.com/gp/product/B09X45S4L1/
• rp-tnc -> bnc adapter | $10 | https://www.americanradiosupply.com/rp-tnc-male-to-bnc-female-coaxial-adapter-connector-rfa-8933/

Optional: EZ connect hat for rapid Prototyping (avoids soldering connections):

• Pi-EzConnect HAT | $20 | https://www.adafruit.com/product/2711
• GPIO Stacking Header | $3 | https://www.adafruit.com/product/2223

Base Cost: About $350

Supported RFID Readers:  

• Impinj R420 | $variable | https://www.atlasrfidstore.com/impinj-speedway-revolution-r420-uhf-rfid-reader-4-port/

Total Costs:  

• w/ R420 (Used: $750 ea): $1,100
• w/ 2xR420 (Used: $750 ea): $1,850