How to use ASK transmitter module and superheterodyne receiver module with DEMO board

STX882 ASK transmitter module and SRX882 superheterodyne receiver module are products developed by NiceRF Wireless, with high stability and cost-effectiveness, and are widely used in remote control doors, wireless data transmission, wireless security alarms, and other fields. These two products are deeply loved by customers in the remote control industry. Since some new users do not know how to use this product, this article will introduce the use of ASK transmitter modules and superheterodyne receiver modules with DEMO boards.

1. Transmitter (ASK transmitter module STX882 DEMO board)

（ASK transmitter module STX882 DEMO board interface description diagram）

There are 3 ways to choose the power supply of the DEMO board of the ASK transmitter module. Choose one of them to supply power to the DEMO board.

1. It is powered by 3 AA batteries installed on the back of the DEMO board of the ASK transmitter module.
2. A 12V 23A battery is installed on the back to supply power.
3. Connect the external 5V power supply through the external power interface on the front.

The DEMO board of the ASK transmitter module has 5 areas for the selection of shorting caps. The first four are for the selection of coding modes. They are HT12E, PT2262, EV1527, and MCU. The last MODE shorting cap is used to select whether the trigger mode is button trigger or timing. trigger.

Example: When only the HT12E shorting cap is short-circuited, when any key is pressed, the ASK wireless transmitter module will transmit the coding command of the corresponding key of the HT12E. When shorting the MCU and MODE at the same time, the ASK wireless transmitter module will transmit MCU timing commands once per second. When only the MCU is short-circuited, press any button, and the ASK wireless transmitter module will transmit the coding command of the corresponding button of the MCU.

Note: There can be one and only one signal source, that is, only one of the four short-circuit caps can be short-circuited at the front, and two or more than two can not be short-circuited at the same time. The MODE jumper cap is only valid when the signal source is MCU. And the current four shorting caps can only short-circuit MODE when the MCU is short-circuited, and the button will be invalid after short-circuiting MODE.

The launching board has a launching signal indicator. The red LED on the left side of the LCD screen will be lit when there is data being transmitted, and it will go out after the data is sent. At the same time, there is also an LCD screen that will display the number of data packets transmitted. Every time data is transmitted, the number displayed on the LCD screen will increase by 1, and the display range is 0~65535. It will be displayed cyclically and will be reset after the shutdown.

The transmitter board has 4 buttons, which correspond to the status of the 4 LED lights on the receiver. Each button operation will cause each encoding chip to generate a corresponding encoding signal (for encoding signal details, please refer to the technical manual of each encoding chip). If the MCU mode is selected, the MCU will generate a Manchester code of 1KHz. When the button of the transmitter is pressed, the corresponding LED of the receiver will light up.

Note: The button will be invalid when MODE is shorted.

Each time the receiving DEMO board receives a packet of data, the LCD of the receiver will automatically increase by 1.

2. Receiver (superheterodyne receiver module SRX882 DEMO board)

(Superheterodyne receiver module SRX882 DEMO board interface description diagram)

SRX882 superheterodyne receiver module DEMO board power supply selection (Note: select one of the methods to supply power to the DEMO board.)

1. Install 3 AA batteries to supply power through the 3 AA batteries on the back of the receiver.
2. Connect an external 5V power supply through the external power interface on the front.

The transmitter has 4 shorting cap selection areas, namely MCU, HT12D, PT2262, and EV1527. Used to select the signal source to be decrypted. Its configuration should be consistent with the transmitter.

The receiver has 1 LCD screen and 5 LED indicators. The LCD screen displays the number of data packets received. Every time data is received, the number displayed on the LCD screen will increase by 1 accordingly, the display range is 0~65535, it will display in cycles, and it will be reset after shutdown. Five LED indicators are used to display the signal commands currently received. When MCU is on, it means that the MCU timing command sent by the transmitter is currently received. When K1 is on, it means that the K1 key command sent by the transmitter is currently received, and K2 is on, it means that the K2 key command sent by the transmitter is currently received, and so on.

The above is the method of using ASK transmitter module STX882 and superheterodyne receiver module SRX882 with DEMO board. If you encounter any problems during use, welcome you come to consult us @ sales@nicerf.com.