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SIM800L 2G Module
The cheap 2G veteran
Page 59 drives the SIM800L as a generic cellular module: signal strength, operator, registration state, SMS and dialling all go through the AT channel.
β Power is its weak point: 3.7β4.2 V with 2 A peaks. Feeding it from the board 3V3/5V makes it reboot in a loop, and the page keeps a supply warning on screen.
Screen
On-screen interface
A recreation of this page on the 2.41-inch AMOLED display (600 Γ 450). Actual interaction and layout follow the latest firmware.
Signal-71dBm Β· good
Networkregistered Β· CHN-UNICOM
APN / IP3gnet Β· 10.42.7.19
Supply3.4β4.2 V Β· own supply
Health88
Shares 43/44 with p.19/32/34 β one at a time
Screen Β· Page 59
May differ from the actual interface; the screen of the real device is the final reference.
Highlights
Key capabilities
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AT channel
Uses 43/44, exclusive with pages 19/32/34.
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Supply warning
Reminder about 3.7β4.2 V / 2 A.
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SMS
Send and receive, Chinese via UCS2.
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Health score
No SIM, no registration and brownout separated.
Specifications
Technical specs
Network2G GSM/GPRS 900/1800 MHz
UART43 (TX) / 44 (RX), exclusive with pages 19/32/34
Supply3.7β4.2 V, 2 A peak (separate supply)
Firmware pagePage 59
Use Cases
Typical scenarios
SMS trigger
One text message fires an action.
Cheap telemetry
Lowest data cost for occasional reports.
Commands
Related commands
page 59 Open the SIM800L page at Send a raw AT command
β Boundaries & notes
- β Needs its own 3.7β4.2 V supply with 2 A peaks; the board alone cannot feed it.
- 2G is being retired in many regions β check coverage first.
- Competes with pages 19/32/34 for the same UART.
Other feature pages
π Overview Home12-tile quick launch plus everyday toggles β the power-on default, and where everything starts.β‘Dashboard Β· Power & ConsumptionBLE-connected current meter with live voltage/current/power curves at fixed-point 10βΆ precision.πWaveform PanelLive curves for frame rate, heap and task load β spot the bottleneck at a glance.π΅BLE DebuggerBLE scan/connect/service discovery with full GATT tree browsing and read/write.