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| | Welcome to the CyBENCH Project Pages - 4bit RF remotePart 3 - Adding power leads and Test leds The alarm used to have an internal voltage regulator circuit - until we ripped it out. This used to generate an interal power supply rail of about 10V. We will directly provide a 9v supply from a PP3 battery. To do this: 1. Connect Pin 8 of IC4 to +9v of the battery, red wire on a PP3 battery snap. 2. Connect Pin 4 of IC4 to 0v of the battery, black wire on a PP3 battery snap.  Test leds If you wish, you can build a simple tester using four 1k resistors and 4 led's    I needed to do this to prove the system as I hacked it together. An alternative solution would by to use the 5mm red led that is provided on the flying lead. Simply connect the black wire to a suitable 0v connection (picture below) Then use the striped wire to probe the data output pins of the decoder. NOTE: This is a flashing led with an internal resistor in the cable assembly  0v connection for the test led (black wire)  Test Led in use TESTING: When you first power the alarm unit up, no leds should illuminate. When you press the Disarm button on a keyfob, two leds should light:   When you press both buttons together, all leds should light:  At this stage, there is no way to control the two leds connected to pins 12 and 13 of the decoder. |
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