Smallest Digital FM Radio Receiver

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Do you miss listening to the radio from the old FM radio box? As much as phones have integrated many applications in it, not all channels of the FM radio can be heard on it. This is mainly due to the external antenna which is absent on phones nowadays.

This DIY is a modern FM radio design that can be controlled on the phone over wifi. The size of this radio is so tiny that it can even fit in our pocket.

The components shown in the Bill of Material table are needed for our project.

Fig 1. FM Radio

Bill Of  Material  

Prerequisite 

The Arduino IDE is used to programme the ESP, hence the ESP board should first be installed onto the Arduino. The WEB UI is used to control the FM radio. EASY UI library gives us the option to easily create the WEB UI. To use the FM radio chip(RDA580M), the appropriate radio library is installed. 

Coding 

After the installations, all the libraries(UI and radio) are included to be used via WiFi. The RD5804M chip is set as an instance in the code and the UI parts are added. Five blocks are used here to control the switching, while one centre block is used to scan the available FM channels. A slider is needed in UI to for changes in volume and also to tune the radio frequency. A text box is also needed to display the current FM channel that is being listened to. Now the frequency has to be set up for the radio chip. In simple words, the FM channel should be changed to the next available channel when the left/right buttons are touched/clicked?. Similarly, the functions for each button have to be assigned.

Connection 

Connect the RD 5804 M chip with the ESP and other components as shown in figure 2.

Fig 2. Connection
Smallest FM radio  receiver CHIP
Fig 3. Smallest FM radio receiver CHIP

 

Testing 

The ESP will be connected to the phone/laptop’s internet connection automatically. If not, the ESP itself connects to the phone/laptop. In a browser enter the following IP address.

192.168.4.1 

The UI to control the FM radio would be displayed on your device. Upon touching/clicking the ‘scan’ option, all the available FM stations would be scanned. As shown in figure 3, the relevant channel can be selected and the volume can be set accordingly. Enjoy listening to the radio while carrying it in your pocket. 

Fig 4: UI to control the FM Radio

 

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