diyAudio Forums Archive > Top > Source > Digital RS232 Relay Control (Logic) - Click HERE for Original Thread Morbid Hi im trying to build a software-controlled AC relay switches, the idea is to control by buttons on 2-7 AC slots. any schematic or idea?? open source software? i know the principle. to build relay operated by a logic status... i need rs232 - > data -> bit decoder (or logic gates) -> bit to 5V -> 5v operate relay (220VAC) - > status change thanks, Chen. jobstens Hello ! Here is a circuit, that receives serial data and outputs them parallel. It also could send parallel data in serial format. You don't need to build the transmitter if you don't use it. Both units could operate on independent baudrates. The circuit outputs all data on the serial line. You just have to send a serial byte (terminal program, basic program or something) to switch the outputs. Regards Jobstens Morbid hi! thanks, the 4094 is a register shift isnt it? its the output decoder? i'll have logic 1 (5V) at 0-7 outputs by the command i send? jobstens Moin ! the 4094 is a register shift isnt it? Yes, see datasheet below ... its the output decoder? The 4094 it's the mainpart of the receiver. the both 4017 and the 4081 are only to detect the startbit and counting the bits. i'll have logic 1 (5V) at 0-7 outputs by the command i send? the circuit outputs ~0V at L and ~5V at H (If I remember right). You only need to connect a transistor that drives the relay. I think that the IC couldn't drive a relay. You know that whole stuff with diode ? (some basics: http://www1.jaycar.com.au/images_uploaded/relaydrv.pdf http://www.kpsec.freeuk.com/compone...lay.htm#protect http://www.ami.ac.uk/courseware/mic...cro05diode.html ) Datasheets: 4017 - 5-stage Johnson counter http://www.semiconductors.philips.c...4017B_CNV_3.pdf 4021 - 8-bit static shift register http://www.semiconductors.philips.c...4021B_CNV_3.pdf 4060 - 14-stage binary ripple counter with oscillator http://www.semiconductors.philips.c...T4060_CNV_2.pdf 4081 - Quadruple 2-input AND gate http://www.semiconductors.philips.c...4081B_CNV_3.pdf 4094 - 8-stage shift-and-store bus register http://www.semiconductors.philips.c...4094B_CNV_3.pdf LT1181 - dual RS232 driver/receiver pairs http://www.linear.com/pdf/11801afb.pdf If you like, you could replace the LT1181 by a MAX232 or something like that ... (if you do that, you have to compare the datasheet!) Regards Jobstens Morbid thanks! i made some transmitter programming circuit with the MAX232, and i guess its easier to get one here instead of the other chip mentioned....thanks :)

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