CitySense Node Hardware Design

Node Hardware Design

Our current design includes the use of a NEMA-6 enclosure from PacWireless. We use the Soekris Net4826 single-board-computer (SBC). Our power is supplied by an N2Power XL125 125 Watt AC to DC power converter that connects to city streetlight power. The extra power allows for the future addition of sensors with large power requirements.

The following images shows the latest node enclosure design. It includes the single-board computer (soekris net-4826), a 12 VDC power supply, a Vaisala GMP-343 Carbon Dioxide density sensor (0-2000 parts-per-million by volume), an 802.11 a/b/g (100 mW) radio with an externally mounted 8.5 dBi omnidirectional antenna, an 900 MHz 802.11 radio (700 mW) with a 6.5 dBi omnidirectional antenna.

Node
interior Node exterior Node mounted

See the schematic drawings for details of the node design:

Mechanical drawings of the mouting plate for the VaisalaWXT510
Mechanical drawings of the electronics mounting.
Wiring connections for the Soekris, Vaisala and N2Power supply.