Tea vending machine

i'm making a project on automatic tea dispenser with quantity of only 80ml so i want to make a circuit for operating solenoid valve (which is normally closed) with manual on and automatically shut off after 5-6sec but after shut off it should count and display on LCD that how many times tea is dispensed. it means as soon as solenoid is closed LCD will show no. 1 for first count and more for other

by vishalsmore111
January 10, 2018

1 Answer

Answer by mikerogerswsm

I'd use an ICM7224. This increments on a negative edge, so you may need to add an inverter. Some sort of buffer/level shifter is also desirable.

+1 vote
by mikerogerswsm
January 10, 2018

Also a 555 for the valve timer.

by mikerogerswsm
January 10, 2018

Can u give me circuit diagram ?

by vishalsmore111
January 11, 2018

I've pointed you in the direction I would go, but it's your project and I think you need to do the detail design work yourself. Ask your prof, I'm sure he'd agree. Good Luck, mike (retired ex-lecturer).

by mikerogerswsm
January 11, 2018

I'm from mechanical so i dont have much more knowledge about electronic so i asked you. Anyways Thank you so much for your guidance

by vishalsmore111
January 11, 2018

I guess you could use a weighing device and a mechanical counter, more appropriate in a mechanical project. If you must have a timer, then what about the bimetallic mechanical type used in early Morphy Richards toasters?

by mikerogerswsm
January 12, 2018

I'm serious. Try googling bimetal timer and you'll find items like this one: http://www.ulanet.com/212.html mike

by mikerogerswsm
January 12, 2018

....and the counter could look like a clock dial, or more professionally could be a Veeder Root type: https://www.specialtyproducttechnologies.com/veeder-root

by mikerogerswsm
January 12, 2018

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