R031 76.0MHz-108.0MHz Stereo FM Radio Module FM Receiver Board w/ Power-off Memory & Mute Functions

Instructions:
1.1. Semi-automatic station search: short press the F+ button to search upwards. When it finds a station, it will stop searching and play the station. When the red light flashes, it means that the highest end of the working frequency has been searched upwards. At this time, press the F- button to search downwards.
1.2. Manual station search: long press the F+ button for about two seconds, the red light will flash, and the receiving frequency will increase by 0.1MHz.

2.1. Semi-automatic station search: Short press the F- button to search for radio stations downwards. When it finds a radio station, it will stop searching and play the station. The flashing red light indicates that the lowest end of the working frequency has been searched downwards. At this time, press the F+ button to search for radio stations upwards.
2.2. Manual station search: Long press the F- button for about two seconds, and the receiving frequency decreases by 0.1MHz.

3. Short press the V+ button to increase the volume by one level, with a total of 9 levels. Level 8 is the loudest and level 0 is the silent mode. Long press the V+ button to restore the factory default parameters (frequency 99MHz and volume level 6).

4. Short press the button V- to decrease the volume by one level, with a total of 9 levels. Level 8 is the loudest and level 0 is the silent mode. Long press the button V- to shut down.

5. After shutting down, press any button to turn on.

6. If there is no button operation, the indicator light will go out after 30 seconds, but the radio will still be listened to normally.

7. After the indicator light goes out, press any button to wake up the relevant circuit. When the light comes back on, the button is non-functional and only has the function of waking up. After the light comes on, each button has a corresponding function to prevent false triggering during use.

8. The headphone jack is the audio output. Your headphone cable can also serve as an antenna. The port uses a standard 3.5mm specification, which can directly drive commonly used 32 ohm earbuds.

Notes:
1. The positive and negative poles can not be connected in reverse. If you don't know how to wire, please consult customer service.
2. The soldering iron must be well grounded during soldering. For soldering irons priced below 80 yuan, it is recommended to unplug the power before soldering.
3. The headphone socket is a 3.5mm standard dual-channel stereo interface with 3 sections. Therefore, the headphone plug inserted into the module also needs a standard 3.5mm dual-channel stereo plug with 3 sections (attention: the plug of mobile phone earbuds is 4-section and can not be used for this module).