⚠️ power GSMNeo directly from an Arduino’s 5V pin – it will cause resets. Use a dedicated 2A+ regulator or Li-ion battery. 3. Basic AT Command Sequence After power-on and waiting ~5 seconds for network registration:
AT+CMGS="+1234567890" > ALERT: Water leak detected in basement.␛ Pair GSMNeo with a GPS module. Every 5 minutes, send location via HTTP POST: gsmneo
| GSMNeo Pin | Connect to | |------------|-------------| | VCC | 3.8V–4.2V (peak current up to 2A) | | GND | Common ground with microcontroller | | TXD | Microcontroller RX (use level shifter if 5V logic) | | RXD | Microcontroller TX (level shift) | | PWR_KEY | Pull low for 1–2 seconds to power on | ⚠️ power GSMNeo directly from an Arduino’s 5V