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SIM800L V2 5V GSM GPRS MODEM TTL with antenna
SIM800L V2 5V GSM GPRS modem with TTL serial interface and external antenna—ideal for SMS, calls, and IoT communication projects.
The SIM800L V2 5V GSM GPRS Modem TTL with Antenna is a compact and powerful cellular communication module that enables GSM voice calls, SMS, and GPRS data transmission for embedded and IoT applications. This V2 version includes an onboard 5V power regulation, allowing direct connection to Arduino, ESP32, ESP8266, Raspberry Pi, and other TTL serial devices without complex power circuitry.
The module communicates via UART (TTL) serial interface using standard AT commands. It supports quad-band GSM (850/900/1800/1900 MHz) for wide network compatibility. Supplied with an external antenna, the modem ensures reliable signal reception and stable communication.
Common applications include SMS alert systems, GPS trackers, remote monitoring, smart meters, security systems, and IoT projects.

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- Independent development MCU platform
- High cost performance
- Support UART / GPIO data communication interface
- Support STA / AP / STA + AP coexistence mode of operation
- Support SmartLink intelligent networking (APP)
- Support wireless upgrade firmware
- Support WPS network configuration
- Built-in onboard antenna &Temperature and humidity sensor
- RGB three-color light adjustable
- Provide rich AT command set configuration
- Free AiCloud cloud service for debugging
- 3 AA batteries / 5V adapter power supply
- Size: 61.6mm x 56.2mm;
HC-06 4Pin Bluetooth Module Without Reset Switch
- Working current: matching for 30 mA, matching the communication for 8 mA.
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- Use the CSR mainstream Bluetooth chip, Bluetooth V2.0 protocol standards.
- Potter default rate of 9600, the user can be set up.
- Bluetooth protocol: Bluetooth Specification v2.0+EDR
- Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps.
- Security: Authentication and encryption.
- Profiles: Bluetooth serial port.
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Text to Speech TTL Module (Serial to Speech)
-  Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Â Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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 Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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 Voice effect optimization
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 Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes

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