GT-38 Wireless Transceiver Module SI4438 433MHz – Serial Wireless Link
The GT-38 wireless serial communication module is a new generation of multi-channel embedded wireless data transmission module. The wireless working frequency band is 433-458.5MHz, and multiple channels can be set. The stepping speed is 100KHz, and there are 255 channels in total. The module’s maximum transmit power is 100mW (20dBm), the receiving sensitivity is -116dBm at 5000bps air baud rate, and the open distance can reach 1200m communication distance.
The module features stamp hole encapsulation and can be easily patch-welded. Its compact dimensions of 26.7mm × 12.9mm × 6mm (including the antenna cap and spring antenna) make it convenient for integration into various applications. The module includes a PCB antenna holder (ANT1) that allows users to connect an external 433M frequency band antenna via a coaxial line. Additionally, it has an antenna soldering hole (ANT2) for attaching a spring antenna, giving users the flexibility to choose the antenna that best suits their needs.
Equipped with an internal MCU, the module requires no separate programming, facilitating straightforward serial data transmission in various transparent modes. Users can select from multiple serial port transmission modes using AT commands based on their specific requirements. The four modes—FU1, FU2, FU3, and FU4—have average idle current draws of 3.6mA, 80μA, 16mA, and 16mA, respectively, with a maximum operating current of 100mA during full power transmission.
Features/Specifications
- Model GT-38
- Module size 26.7×12.9×6mm
- Chip Solution SI4438
- Working frequency band 433~458.5MHz
- Communication Interface UART 3.3V/5V TTL Level
- Antenna interface spring antenna / antenna socket
- Working voltage 3.2~5.5V
- Sleep current no sleep mode
- Communication level 3.3V/5V level
- Working humidity 10%~90%
- Transmit power 20dBm (MAX)
- Working temperature -25°C~+75°C
- Reference distance 1200m
- Storage temperature -40°C~+85°C
AT Commands
- Test communication AT
- Change the serial port baud rate command AT+Bxxxx Example: Set the module serial port baud rate to 19200bps, please send the module command “AT+B19200”, the module returns “OK+B19200”.
- Change the channel of wireless communication AT+Cxxx Example: Set the module to work on channel 21, please send the module command “AT+C021”, the module returns “OK+C021”. After exiting the command mode, the module operates on channel 21 and operates at 435.1 MHz.
- Change the module serial transmission mode AT+FUx Example: Send the module command “AT+FU1”, the module returns “OK+FU1”.
- Set the module’s transmit power level AT+Px Example: Send the module command “AT+P5” and the module returns “OK+P5”. After exiting the command mode, the module transmit power is +11dBm.
- Get the single parameter of the module AT+Ry Example 1: Send the module command “AT+RB”. If the module returns “OK+B9600”, the serial port baud rate of the module is 9600bps. Example 2: The module command “AT+RC” is sent. If the module returns “OK+RC100”, the communication channel of the module is queried to 100. Example 3: Send the module command “AT+RF”. If the module returns “OK+FU3”, the module is queried to work in serial port transparent transmission mode 3. Example 4: The module command “AT+RP” is sent. If the module returns “OK+RP: +20 dBm”, the module’s transmit power is queried to be +20 dBm.
- Get all the parameters of the module AT+RX Example: Send the module command “AT+RX”, the module returns “OK+FU3 OK+B9600 OK+C100 OK+RP:+20 dBm”.
- Set the data digits, check digits and stop bits of serial communication AT+Uxxx Example: To set the serial port format to 8-bit data bit, odd parity, 1 stop bit, please send the module command “AT+U8O1”, The module returns “OK+U8O1”.
- Query module firmware version information AT+V
- Setting the sleep mode AT+SLEEP When the data is not transmitted wirelessly, in order to save power, the module command “AT+SLEEP” is sent, and the module returns “OK+SLEEP”. When it enters the AT setting state again, it automatically exits the sleep mode.
- Restore the serial port baud rate, communication channel, and serial port transparent transmission mode to the factory default values. AT+DEFAULT
Package Includes
1 x GT-38 Wireless Transceiver Module SI4438 433MHz – Serial Wireless Link
Arduino 7-Segment Multiplexing: Drive 4 Digits on Few Pins
Driving a 4-digit 7-segment display might seem like it needs dozens of pins — after all, each digit...
Read More →
ESP32 Email Alert: Send SMTP Notifications from Sensors
Esp32 Email Smtp Alert — this detailed tutorial covers everything from hardware selection to complete working code, designed...
Read More →
Arduino Power Supply Guide: Vin, 5V Pin & External Power
Powering your Arduino correctly is one of those topics that beginners often gloss over — right up until...
Read More →Technical Specifications
| Model | GT-38 |
|---|---|
| Frequency | 433MHz |
| SKU | AI0837 |
| Weight | 0.0 kg |
| Availability | Out of Stock |
Applications & Use Cases
The GT-38 Wireless Transceiver Module SI4438 433MHz - Serial Wireless Link is a versatile bluetooth and nrf modules used across a wide range of applications including electronics projects, DIY builds, prototyping, and educational experiments.
Common use cases:
- Integrating into a custom electronics project
- Learning and experimenting with circuits
- Replacing or upgrading components in existing setups
This product is ideal for electronics enthusiasts, engineers, and students.
Technical Tip: Always verify voltage and current requirements before connecting to your circuit. Check datasheets for detailed specifications and pin configurations.
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
Tejas Sethi (verified owner) –
Excellent GT-38 Wireless Transceiver Module SI4438 433MHz! Good quality connections, no loose wires. Perfect for prototyping.
Ayush Vyas (verified owner) –
Superb GT-38 Wireless Transceiver Module SI4438 433MHz! Using these in all my Arduino projects. Very durable.
Yash Srivastava (verified owner) –
Love this GT-38 Wireless Transceiver Module SI4438 433MHz. Insulation is good quality and the gauge is perfect.
Dinesh Das (verified owner) –
Great quality GT-38 Wireless Transceiver Module SI4438 433MHz. Fits perfectly on my breadboard. Color coded which helps a lot.
Shubham Mishra –
This GT-38 Wireless Transceiver Module SI4438 433MHz is essential for any electronics workbench. Good quality at great price.
Urmi Das (verified owner) –
This GT-38 Wireless Transceiver Module SI4438 433MHz is exactly what I needed. Connections are solid and reliable.
Pallavi Yadav (verified owner) –
Love this GT-38 Wireless Transceiver Module SI4438 433MHz. Insulation is good quality and the gauge is perfect.
Isha Batra (verified owner) –
Outstanding quality wires! This GT-38 Wireless Transceiver Module SI4438 433MHz makes prototyping clean and professional.
Vinay Rawat (verified owner) –
Perfect GT-38 Wireless Transceiver Module SI4438 433MHz for my lab. Organized my workbench with these. Great purchase.
Neha Sen (verified owner) –
Outstanding quality wires! This GT-38 Wireless Transceiver Module SI4438 433MHz makes prototyping clean and professional.
Ankit Banerjee (verified owner) –
This GT-38 Wireless Transceiver Module SI4438 433MHz is essential for any electronics workbench. Good quality at great price.
Varun Srivastava (verified owner) –
Nice GT-38 Wireless Transceiver Module SI4438 433MHz. Connections are reliable. Length is adequate for breadboard use.
Rishabh Goyal –
Nice GT-38 Wireless Transceiver Module SI4438 433MHz. Connections are reliable. Length is adequate for breadboard use.
Deepika Batra (verified owner) –
This GT-38 Wireless Transceiver Module SI4438 433MHz is exactly what I needed. Connections are solid and reliable.
Hemant Naidu (verified owner) –
Great GT-38 Wireless Transceiver Module SI4438 433MHz. Bought in bulk for my electronics lab. Excellent value.
Sonali Patil –
Average GT-38 Wireless Transceiver Module SI4438 433MHz. Works for basic prototyping but connector quality could be better.
Harshit Choudhury –
Average GT-38 Wireless Transceiver Module SI4438 433MHz. Works for basic prototyping but connector quality could be better.
Deepika Rawat (verified owner) –
Superb GT-38 Wireless Transceiver Module SI4438 433MHz! Using these in all my Arduino projects. Very durable.
Sarika Vyas (verified owner) –
Perfect GT-38 Wireless Transceiver Module SI4438 433MHz for my lab. Organized my workbench with these. Great purchase.
Shreyas Panchal (verified owner) –
Good GT-38 Wireless Transceiver Module SI4438 433MHz. Quality is fine for prototyping. Some colors are hard to distinguish.
Comal C.R.Ramesh (verified owner) –
Siddharth Shetty (verified owner) –
Very satisfied with this GT-38 Wireless Transceiver Module SI4438 433MHz. Connectors grip well and don’t fall out.