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Rolling Code Security System; Pt.2

Last month, we described the circuitry and gave the PC board assembly details for our new Rolling Code Keyless Entry System. This month, we cover the installation and setting-up procedures and describe the optional SOIC adaptor board, so that you can program the PIC micro out of circuit.

Pt.2: By John Clarke

Having completed the receiver board assembly, as described last month, it can be housed in a UB3-size utility box. As shown in the photo last month, it simply clips into place but first you will need to drill a hole in one end for IRD1, plus a hole in the other end for the external wiring.

Click for larger image
Fig.6: the test LEDs are connected to the receiver as shown here. Follow the procedure in the text to synchronise the transmitters and test the receiver.

You will also have to drill matching holes in the lid for the Ack/Power and Arm LEDs (LEDs1 & 2).

Now for the initial set-up. First, install a jumper link in the minus (-) position for LK2. This will set the Strike2 output to toggle mode (note: LK2 must always have a jumper connection, either to the "+" or "-" position). Leave jumpers LK1, LK3 & LK4 out for now.

Next, set trimpots VR1 & VR2 to mid-range. These trimpots are later used to set the various time periods.

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