SunFounder 3in1 Kit
6.1.4 1.4 Connecting the R4 board to Blynk
1. Reconnect the ESP8266 module and R4 board, here the software serial is used, so TX and RX are connected to
pins 2 and 3 of R4 board respectively.
Note: The ESP8266 module requires a high current to provide a stable operating environment, so
make sure the 9V battery is plugged in.
278 Chapter 6. IoT Projects
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