$7 to $20
This component can give any microcontroller access to a WiFi network. The ESP8266 can either host an application or offloading all WiFi networking functions from another application processor.
It is used as a computer’s main memory. Each DRAM memory cell comprises a transistor and a capacitor within an integrated circuit, and a data bit is stored in the capacitor.
USB power switch
1 × $2.00 
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