Scroll down to compare compatible Arduino Relay Shields at different stores and find the best price.
A Relay Shield provides an easy way to control relays with the Arduino. The relays allow you to control high voltages with low voltages, like the ones provided by the Arduino header pins.
Aliexpress.com
Ebay.com
$19.95
2 new
from $19.95
as of September 25, 2019 8:26 pm
£20.99
1 new
from £20.99
as of September 25, 2019 8:26 pm
Amazon.co.uk