Instructions

3
Product overview
The Whadda two-channel Solid State Relay (SSR) module can be used to quickly and efficiently
switch AC loads on and off without using any moving parts (e.g. like a classic electromechanical
relay).
The SSR module uses a phototriac to provide a galvanic isolation between the logic level side and
the AC load side. Both channels can be switched on by providing a LOW logic level signal (0 – 1,5 V),
and off by providing a HIGH logic level signal (3 – 5 V) to its corresponding channel signal input.
Note that this module can ONLY SWITCH AC CURRENTS, up to a maximum of 2 A, with a
maximum voltage of 240 V AC. Trying to use this module to switch DC loads or exceeding the
specified limits can damage the module and/or your connected devices!
Specifications:
Max. load voltage: 240 V AC
Max. load current: 2 A
Supply voltage: 5 V DC
SSR working current: 12,5 mA
SSR trigger voltage: 0 – 1,5 V DC
SSR trigger current: 2 mA
Weight: 19,7 g
Dimensions (W x L x H): 55 x 33 x 23 mm
Wiring description
Pin
Name
Arduino® connection
VCC
Supply voltage (5 V DC)
5V
GND
Ground
GND
CH1
SSR channel 1 signal
Digital Pin (e.g. D)
CH2
SSR channel 2 signal
Digital Pin (e.g. D)
A1
SSR channel 1 Load
-
B1
SSR channel 1 AC voltage source
-
A2
SSR channel 2 AC voltage source
-
B2
SSR channel 2 Load
-