USB/TTL Raspberry Pi GPS Tracker (Compatible with Raspberry Pi 4B) SF_Arduino Shields You can actually see serial

You can actually see serial traffic on the LEDs to verify if the board is working

It is suitable for the hydrogen leakage alarm and other application scenarios

this gear motor offers a bit more speed at less cost to you

If the contact load voltage and current of the relay are in the region enclosed by the solid and dotted lines in the figure below

USB/TTL Raspberry Pi GPS Tracker (Compatible with Raspberry Pi 4B) SF_Arduino Shields You can actually see serialUSB TTL Raspberry Pi GPS tracker is a small GPS location module. It is using L80 39 GPS chip, which includes 66 search channels and 22 simultaneous tracking channels. These features can improve its satellites connection speed. GPS tracker has USB and TTL two ports, it is easy to be used with Raspberry Pi, Arduino, STM32 and other kind of micrcontrollers. And it is totally compatible with most of Raspberry Pi, like Raspberry Pi 3 Model B, Raspberry Pi