PIC+CC2500 based, around 30 meters range.
RF data modem working at 2.4 Ghz frequency in half duplex mode with automatic switching of receive/transmit mode with LED indication. Receives and Transmits serial data of adjustable baud rate of 9600/4800/2400/19200 bps at 5V or 3V level for direct interfacing to microcontrollers. This model can work with Sunrom model 1252(USB).
RF modem can be used for applications that need two way wireless data transmission. It features high data rate and longer transmission distance. The communication protocol is self controlled and completely transparent to user interface. The module can be embedded to your current design so that wireless communication can be set up easily.
When setting a RF serial data communication between microcontrollers or a microcontroller to PC, the RF modem is most useful and easy to implement.
This module works in half-duplex mode. Means it can either transmit or receive but not both at same time. After each transmission, module will be switched to receiver mode automatically. The LED for TX and RX indicates whether IC is currently receiving or transmitting data. The data sent is checked for CRC error if any. If chip is transmitting and any data is input to transmit, it will be kept in buffer for next transmission cycle. It has internal buffer for incoming data so they do not get lost when module is active transmiting data.
When you power on the unit, the TX LED will briefly blink indicating that initialization is complete and it is ready to use.
The RX LED is directly on TX OUT pin to indicate that actual data is received and it is sent to output pin.
Baud Rate Setting
Baud rate has to be set when unit is OFF, as the jumper setting are read only during power up. Modifying during power up will have no effect on operation of module. To make any jumper on, short that jumper by soldering its pads. By default unit is supplied with no jumper.
There are two jumpers on PCB called B1 and B2. Normally they are left open so unit is in 9600 baud rate. Solder the two pads to make them ON so you can configure baud rate as per settings below
Frequency channel setting
Setting Frequency Channel can be used to have multiple sets operating at same time but without interfering with each other. The pair having same Channel setting will be able to communicate with each other. Frequency channel has to be set when unit is OFF, as the jumper are read only during power up. Modifying this setting during operation will have no effect on operation of module. To make any jumper on, short that jumper by soldering its pads. By default unit is supplied with no jumpers set making it channel#1.