Touchless Hand Sanitizer
Welcome to the touchless-hands-sanitizer wiki!
Create a home-made touchless hands sanitizer
- use existing manual spray
- use ESP with Wifi
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- collect usage data
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- control sanitizer availability
- use simple motor
- use simple IR sensor
#1st iteration
- computer charger
- aquarium motor
- nozzle from a garden sprayer
- pipes
- not the most common pieces
- the motor does not work well if it is not inside the liquid
- denser sanitizers may block the nozzle
- tested the motor pulling the liquid up from a bottle and failed
- the source liquid would need to be at the same level or above the motor, hence more difficult to reload sanitizer
#2nd iteration
Why not use the gravity?
- The sanitizer would be placed in a simple bottle upside-down.
- The system would be easy to refill then.
- The control with IT + Arduino + valve.
- The valve would be normally closed, but how to source one now?
Solution with a solenoid like the one used here https://www.homemade-circuits.com/touch-free-faucet-circuit/.
Can't find any old solenoid at home!
Will try to order something like this one12V DC Electric Solenoid Valve Water Air Inlet Flow Switch Normally Closed 12mm or this one Electroválvula solenoide 12V 450mA G1/2'' - NC but smaller and cheaper
#3rd iteration
- bottle turned down
- the system is turned upside-down when the liquid is replaced (some care thought...)
- flexible tube is twisted by a servo
- ESP8266 controlling with IR sensor
- MQTT info sent to my mosquitto
- not that easy to refill
- rubber tube may break
- the sensor is affected by the sunlight, but it is easy to fine-tune
- the rubber tube is too close from the wall, hence it is difficult to collect the sanitizer