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ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Small)

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ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module- Works Great forArduino- IDE-/Micropython

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PulseSensor ECG pulse HRV heart rate monitoring analog sensor microcontroller development open source hardware

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