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Lick’O’Meter is a basic type of Resistive Touch switch in its simplest form .
The operation is simple, A Mosfet transistor is used as a switch.
[R1] 10Mohm Resistor voltage divider used for high sensitivity and also keeps the Gate to 
ground when no electrode is touched, so it does not float. 
If one of the electrodes is touched, nothing will happen. But if both of the electrodes are touched 
together, a small amount of current will flow From +V electrode through Our skin (Sweat, Blood, 
Water or other Conductive Material) to the gate of the transistor. 
The transistor will then go from cut-off to saturation mode, the D S region of the transistor will 
form a connection and current will flow through the LED.

There are numerous different ways to implement a resistance touch switch, with transistors, 
with 555, with 741, with CMOS and many more. 
The idea is always the same: Two electrodes are used as the touch plates. 
Current flow from the human skin from one electrode to the other, 
which finally stimulates an amplifier or other current sensitive component. 

===== Abstract =====
Licking behavior in rodents is widely used to determine fluid consumption in various behavioral 
contexts and is a typical example of rhythmic movement controlled by internal pattern-generating
mechanisms. The measurement of licking behavior by commercially available instruments is based 
on either tongue protrusion interrupting a light beam or on an electrical signal generated by 
the tongue touching a metal spout. 


 
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|{{youtube>Gq-HELu10Zg?655}}|

==== Workshop =====
==== Circuit#1 - Paper , Conductive Tapes & Fabrics Lick’O’Meter Circuit ====
 
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=== 3V Coin Cell Holder from EMI Tape ===

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==== Circuit#2 - Etching a Lick’O’Meter Circuit - Copper Tape, Conductive Fabrics,  Pyralux ====

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=== Photo Masks: ===
 
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|{{:lickophotomask.pdf}}|



=== Lithography process with photosensitive dry film & Etching: ===

 
Check Flexible Sticky PCB Fabrication Tutorial [[https://wiki.idiot.io/flexiblestickypcbfabrication|Link]]
 
Preparing DIY Flexible copper tape clad - Step 1

Applying PhotoSensitive Dry Film on Flexible Copper Clad - Step 2 Or follow the steps in this [[ http://www.tech-place.com/en/photosensitive-materials/23-photosensitive-film.html|Link]]

Developing Process with Sodium Carbonate - Step 4
 
 
==== Circuit#3 Lick’O’Duino ====
 
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==== Older Lick’O’Meter Versions: ====

===Electrodible Smart Candy===

{{:electrodibleweb_v3.0.pdf}}

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=== 2n2222 NPN transistor (TO-92) through-hole  package ===
 
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=== Stencil Cutter Lick’O’Meter Workshop(2014)=== 
[[https://imgur.com/a/IOpct?fbclid=IwAR0ozXTiRUWNFxQ5zsPpTFI1-gQNHgCAIDI-Uo5UiCoxsl3_Kj4_s3CA0uY|Photo Album]]
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== sources ==

  *  https://idiot.io/projects/lickometer/
  *  http://www.pcbheaven.com/wikipages/How_a_Touch_Button_works/
  *  http://brianisett.com/2016/03/26/diy-lickometer
  *  https://conductscience.com/maze/portfolio/lickometers/
  *  https://europepmc.org/article/PMC/2366209
  *  https://www.coulbourn.com/product_p/h24-01m.htm
  *  https://scanbox.org/2016/04/14/a-simple-lick-o-meter-and-liquid-reward-delivery-system
  * {{:an_open-source_lickometer_and_microstructure_analysis.pdf}}
  * {{:weijnen1989.pdf}}
  * {{:a_simple_2-transistor_touch_or_lick_detector_circuit_slotnick2009.pdf}}
  * {{:a_sensitive_reliable_inexpensive_touch_detector_anger2007.pdf}}