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Operating Voltage: 5V
The use of high-speed optical coupling 6N137 ensure high-speed without losing step
2 GSM/GPRS module already has a built-in regulator circuit and TTL level converter on the board
Support LED status indicator: Power supply status
This development platform Espressif based on the ESP-8266 is the pins of the Arduino Uno almost compatible and can even be used as some shield modules designed for the classic Arduino Uno
Speak Recognition, Voice Recognition Module V3 Operating Voltage: 5VVoice Recognition Module v3 is a compact and easy control speaking recognition board. This product is a speaker dependent voice recognition module. It supports up to 80 voice commands in all. Max 7 voice commands could work at the same time. Any sound could be trained as command. Users need to train the module first before let it recognizing any voice command. This board has 2 controlling ways: Serial Port (full function), General Input Pins (part of
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