55
4
4
3
3
2
2
1
1
D D
C C
B B
A A
General purpose input/output (GPIO) pins from the URI can sink only 8mA, not
enough for driving a relay coil directly. This circuit will boost the current up to
about 200mA to drive most small relays.
Set GPIO pin high to activate the relay, clear low to de-activate.
9080-24 -
URI GPIO Relay Connection
A
1 1Friday, October 29, 2010
Title
Size Document Number Rev
Date: Sheet of
GPIO
+12V
K1
RELAY SPDT
Q12N4401
R1
4.7K
D11N4001
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