Difference between revisions of "BarBot/Components/Lemon Vendor"
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The lemon vendor dispenses single slices of lemon. The design is based on the mechanism seen in many vending machines, e.g. like the one at Nottinghack. The mechanism is made from a length of mini guttering and a geared motor found in the motors draw at the space. A cam and micro-switch are used to control rotation of the vending coil. One side of a dual L298N H-bridge module along with a ATtiny85 controls the motor. The /RESET signal of the ATtiny85 is used to start the vend cycle. | The lemon vendor dispenses single slices of lemon. The design is based on the mechanism seen in many vending machines, e.g. like the one at Nottinghack. The mechanism is made from a length of mini guttering and a geared motor found in the motors draw at the space. A cam and micro-switch are used to control rotation of the vending coil. One side of a dual L298N H-bridge module along with a ATtiny85 controls the motor. The /RESET signal of the ATtiny85 is used to start the vend cycle. | ||
| − | [[File:20140627 155339 resized.jpg| | + | [[File:20140627 155339 resized.jpg|none|600px|BarBot Lemon Vendor]] |
Notes: | Notes: | ||
Revision as of 19:53, 27 June 2014
Lemon Vendor
General Description
The lemon vendor dispenses single slices of lemon. The design is based on the mechanism seen in many vending machines, e.g. like the one at Nottinghack. The mechanism is made from a length of mini guttering and a geared motor found in the motors draw at the space. A cam and micro-switch are used to control rotation of the vending coil. One side of a dual L298N H-bridge module along with a ATtiny85 controls the motor. The /RESET signal of the ATtiny85 is used to start the vend cycle.
Notes:
- the lemon slices need to be quite thin (2-3 mm)
- the lemon slices need to be larger than the coil diameter, otherwise the coil "screws" over them, rather than pushing them along
Mounting & hardware
Two mini gutter mounts are used for mounting, however these must be fitted near to the motor end otherwise they can interfere with the movement of the lemon slices.
Logical
To vend one slice of lemon the /RESET line of the ATtiny85 needs to be taken low. One vend cycle takes TBC seconds to complete
Connections
- +12V
- Ground
- /RESET ("start" signal)
Power
+12V, TBC mA
Bling
None really! However, there is a red LED on the L298N module which illuminates when power is available.