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Mixer

I made this to keep a small jar of photo-reactive acrylate mixed. It runs from a 5v wall wart power supply. It is controlled by two buttons. One to increase rotation speed and one to decrease it. Pressing both buttons at the same time stores the current speed in eeprom. When turned on it defaults to the stored speed.

Goals

• Rotate small jar to keep contents mixed.
• Speed adjustment.
• Store preferred speed.

Material

• Small plastic box.
• M6 threaded rod and nuts.
• 3mm steel shaft and cartridge bearings.
• Solarbotics GM3 geared motor.
• Stripboard
• ATtiny2313 microcontroller.
• L293D H-bridge.
• 500mA poly fuse.
• Led.
• Push button switches.
• Assorted resistors and capacitors.

Tools

• Hacksaw.
• Cordless Drill.
• File.
• Soldering iron.
• USBtinyISP programmer.

Made over Christmas 2008.