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Home security monitoring prototype
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Old 30th July 2013, 09:47   #1
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Default Home security monitoring prototype

This project is about home security monitoring, but the update is crack for electronics designers. [Simon Ludborzs] continues to work on his prototype and heís fantastic about sharing his success and failure in a conversational manner.

In April we saw his initial design which combined a SIM900 GSM modem with his own board to let him monitor his home security system without hiring a monthly service. Above you can see a snap of his latest prototype. Itís not fully populated as heís testing the power supplyÖ which in this state puts out 0V. Obviously thatís not up to his design specification so he started hunting around for the issue. He tells a tale of woe which is near to our hearts. He removed Q6, which is BC807 transistor, in order to test the FET used on the board. This brought it to life and had him looking into the datasheet of the part and its footprint in Altium. The footprint is right, the schematic symbol is wrong. Thereís a lucky fix though. Above you can see the original design. The fix was just to rotate the part. This is illustrated as a change in the layout, but it worked with the original pad location. Theyíre not square to the transistorís legs but they do still fit the outline.

He goes on to stress test the PSU output and then discuss whether itís enough for the rest of the project. All in all a fascinating read!
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