Originally designed as a charity project, the MWR is a simple internet radio based on the ESP32 microcontroller. Version 2 builds upon the original project introducing stereo audio, supporting multiple channels and utilises a custom PCB with (mostly) surface mount components.
Be warned, This project is still in the prototype phase
- Expressif ESP32-S2 (or similar dual core variant)
- Texas Instruments PCM5102APWR audio stereo dac
- NXP TDA1308 Class AB Stereo headphone driver
- PEC12R - 12 mm Incremental Encoder
- TP4056 Lithium battery charger
- ME6211C33 500mA LDO regulator
- CH340C USB-UART
The PCB can be produced and assembled by a fabrication service such as JLCpcb, who are also able to source a marjority of the parts. Alternatively you can fabricate the PCB and acquire / assemble it yourself. Regardless of which method chosen you will need to solder on the through-hole components yourself.. fortuently this is just the rotatry encoder and the pin headers so only minimal soldering skills are required.
All construction files, including a BOM / CPL are provided in the pcb directory. Additional parts needed to complete the build are maintained in a seperate file.
Component Placement
The JLCpcb assembly tool sometimes misaligns components (especially if a part is substituted). Use these images to confirm placements align with fiducial markers of the pcb.
Commonly misaligned are U1, D1, D2, Q1, X1, U2, U4, Q4, U8, C15 and C20
The case is 3D printed, as above this can be done by a fabrication service if you do not own a printer.
Consider asking your local makerspace about 3D printing!
The firmware is provided in the firmware directory. You will need PlatformIO to build and upload it.
Raise an issue if you would prefer an Arduino IDE version... or PR one yourself
The radio is designed to be easy to use, there is only one control!
- Push dial to switch it on
- Hold dial to switch it off
- Push dial while running to change channel
- Twist dial to change volume
| Colour | Description |
|---|---|
| Blue | Waiting for network |
| Green | Running - Battery Good |
| Amber | Running - Battery Reasonable |
| Red | Running - Battery Low |
| Off | Radio Off / Standby |
The MWR has built-in browser based configuration which allows you to define the Hostname, Wireless network credentials and the playback URL.
Enable Configuration mode
- Switch Off MWR
- Open Faceplate
- Install jumper (2.54mm) or short config pins
- Turn On MWR
- Connect to
MWR-WIFI-SETUPwireless network - Remove Jumper
- Navigate browser to
192.168.1.1 - Enter configuration Details and select
Save - The MWR will automatically restart into radio mode and begin playback
Use SPIFF Files
Alternatively you can enter configuration details directly into the configuration files (host, ssid, pass, url) located in the data directory, this is preferred when mulitiple units require setup.
Multiple station URL's can be entered, there should be one url per line. The following streams are supported:
- MP3 / M3U
- M3U8
- AAC
- FLAC
- OPUS
- OGG
There are lists available online, such as this one, however if you are unable to locate the stream URL of a preferred station I suggest locating the website in which the stream can be listened from, opening your browsers dev tools (usually F12), selecting the Network and finally filter the list be 'Media' types. You may need to reload the page and start/stop playback for it to show up.
