: Pull HIGH for normal data transmission (Transparent mode) or LOW for configuration via AT commands. Example Implementation Scenarios
// JDY-40 connected to pins 2 (RX) and 3 (TX) SoftwareSerial jdy40(2, 3); jdy40 arduino example best
#include <SoftwareSerial.h>
#include <SoftwareSerial.h> #include <DHT.h> : Pull HIGH for normal data transmission (Transparent
is a . While some users report success with 5V, it is safest to use a 3.3V power source to avoid damaging the chip. Arduino Pin Description 3.3V Power (2.2V - 3.6V) GND Common Ground RX (e.g., D2) Connect to Arduino's SoftwareSerial RX TX (e.g., D3) Connect to Arduino's SoftwareSerial TX GND / High GND for AT commands; High/Floating for data transmission GND GND to keep the module awake Best Arduino Example Code jdy40 arduino example best