Coin Picker Robot

As part of coursework, we made a remote controlled coin picking robot from a EFM8 (robot) and STM32 (remote) capable of moving around and picking up coins.

This robot includes:

• Firmware written in C
• Two JDY-40 wireless radios for wireless remote control. Each radio sends or recieves basic letters, which then represents a specific instruction dictated by the code.
• Two H-bridges, enabling directional control for two simple DC motors
• A colpitts oscillator for coin detection. The frequency emitted by the oscillator changes in response to magnetic interference, which allows the robot to detect metal objects such as coins.
• A double jointed servo arm and electromagnet for picking up coins and collecting them in an onboard container.
• An autonomous mode, which enables the robot to move around, detect and pick up coins without human input.
• A Manual mode, which allows a human to control the robot through a joystick and buttons.

Hardware Block Diagram

Figure: Block diagram of the coin picking robot hardware.

Software Block Diagram

Figure: Block diagram of the coin picking robot software.