Sunday, February 7, 2021

Zone expansion board

Over last few weeks I was playing with new addition to OHS, zone expansion board. The
board has 8 analog(balanced) and 1 digital(unbalanced) ports. Analog ports are hybrid, meaning that they can be switched in software to unbalanced. Connection can be established via wire(RS485) or radio(RFM69). It has onboard relay and similar power detection circuit as gateway. There are 2 free pins left that are taken out to allow some user application like additional relay board.

The relay present on expansion board can added as basic relay output, or it can be registered as remote Horn/Siren, by the configuration definition described in expansion board sketch. Also new functionality was added into gateway firmware, which is now able to recognize such remote Horn/Siren nodes and turn them on, when associated group is in alarm state.

Sketch is, as always, present in GitHub. And it is also available for sale.

Wednesday, February 3, 2021

2.0.4 gateway footprint

In case someone would like to drill holes to hold the gateway up in metal casing, or have better understanding of connectors and components on 2.0.4 PCB I've put a PDF file in Google drive for print.

Tuesday, February 2, 2021

A7600E modem tests

The new SimCom A7600E modem is pin to pin compatible and working well in the gateway, so far no software changes needed.  Supporting both 2G and 4G/LTE. One benefit is that it comes up and also shuts down faster then 7600E or G.