Need transistor/circuit help for building a power sensing circuit.
i have crude power sensing system built arduino pro, gprs shield, , relay send me text message when power goes out. arduino powered ups, keep going after power fails. sense failure, have relay held closed usb wall wart plugged directly wall (no ups). when power fails, relay opens, , arduino senses change in state , sends text message. when power comes on, wall wart pulls relay closed again, , message saying power has been restored. if power out longer ups can handle (there's computer attached too), i'll message when arduino starts once power restored.
what want eliminate relay. know should able use transistor instead. don't know @ transistors though. kind of transistor should use? (i know npn, more one?). how wire it? need else in circuit, resistor or diode?
what want eliminate relay. know should able use transistor instead. don't know @ transistors though. kind of transistor should use? (i know npn, more one?). how wire it? need else in circuit, resistor or diode?
you can consider using solid state relay,
http://en.wikipedia.org/wiki/solid-state_relay
for example, vn540 st
max power supply voltage : 45v
input control voltage: 0~5v
output current (continuous) : 2.8a
http://www.st.com/web/en/resource/technical/document/datasheet/cd00070971.pdf
http://en.wikipedia.org/wiki/solid-state_relay
for example, vn540 st
max power supply voltage : 45v
input control voltage: 0~5v
output current (continuous) : 2.8a
http://www.st.com/web/en/resource/technical/document/datasheet/cd00070971.pdf
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