Sad Robot Radio

Last crawled date: 4 years, 2 months ago

A while ago I bought a Sad Robot 1 kit from https://www.madebya2.com.au/product/sad-robot-1/. It is a cute little robot that holds a Nokia 5110 LCD screen and a Arduino Nano. After building the Art Deco FM Radio (https://www.thingiverse.com/thing:3896141) which also uses a Nokia 5110 LCD screen, I decided to turn my little guy into a FM Radio. The right arm has two buttons to increase or decrease the frequency and the left arm has two buttons to increase or decrease the volume. There is a small speaker in its head.
Video
https://youtu.be/qZzJVGkz1BU
3D Printing
To make the radio, you need to print the following parts and replace the ones in your kit:
Sad - Top.stl
This holds a small speaker and printed circuit board (see below)
Sad - Buttons.stl
These arm covers hold two small 6x6mm switches for increasing and decreasing both frequency and volume
Sad - Arms (111%).stl
These are replacement arms in which the depth of each arm has been increased by 111%. This provides room between the battery and the switches
Schematic and PCB
The PCB holds a Arduino Pro Mini, a MCP4011 digital potentiometer, TEA5767 module, an amplifier based on the TEA2025 chip, and some headers for connections. I made my board using the Toner method. I also used two 100K resistors to join the left and right channels of the TEA5767 FM Radio module on the back of the TEA5767 module. Eagle files are included.
Software
The Arduino sketch and libraries used are included. Install the libraries into your Arduino IDE and compile and upload the sketch to your board.