jayachar88 0 Posted October 29, 2013 Share Posted October 29, 2013 Have some 5V SPDT EM-relay (called "sugar cube" relays), rated for ~240VAC-10Amps. To switch those, I believe I cannot directly connect them to the MSP430 launchpad I/O pins, right ? I need to use a BJT/FET -- mandatorily ? The 4 relays in turn control incandesent lamps. If anyone has a circuit schematic they could share, it would be very helpful. thanks, Jay Quote Link to post Share on other sites
chibiace 46 Posted October 29, 2013 Share Posted October 29, 2013 simple. common transistors like pn2222 should work. msp430 pin is the arduino pin etc. 5v to switch the relay up the top. connect the grounds together on your 5v and msp430's 3v supply. can also add a capacitor next to the diode if getting noise issues jayachar88 1 Quote Link to post Share on other sites
nickn 5 Posted November 6, 2013 Share Posted November 6, 2013 Sainsmart sells a board with 4 relays that can be configured to use a separate 5 volt supply. http://www.sainsmart.com/4-channel-5v-relay-module-for-pic-arm-avr-dsp-arduino-msp430-ttl-logic.html Quote Link to post Share on other sites
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