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That's why the blog for this set shows the use of the matrix display with GY-21 temperature and humidity sensor and ESP8266
Fully calibrated
Specifications: 5 megapixel sensor OV5647
and a much faster 300Mbps Ethernet
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16 relais modul Select quantity discount:3x relays That's why the blog forOur AZ Delivery relay modules switch quickly and reliably many switching operations. Thanks to an additional transistor, the module can be switched with most microcontrollers with little current. The relays used are generously dimensioned to allow permanent operation even under difficult operating conditions. The optocouplers and diodes protect your controller from damage. The source of the power supply can be configured with a jumper located on the
