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\laptop\liftbar\electrical\siteground\ring.txt



title: determining options for RING installation

The RING installation is substantialy different depending on the
adjustments for different pre existing installations.


§1) default, conventional, passive coil ringer, mechanical sound generator
   Typically the actuating coil will have a 200 Ohm resistance.
   The two wires at the door can be connected to the RING device.
   The existing resistance in the existing chime or bell will limit
   the current to a safe value.

§2) digital, active, electronic doorbell
   There may have been a light in the door button switch.
   If the RING device draws too much current the existing chime may be activated.
   A 1N4003 diode may be provided, and a resistor may be needed so that
   the existing digital doorbell will not be activated inappropriately.
   It may be that with an electronic door bell system there may not be enough power
   available at the door button to power the RING device; the button may be only
   a sensor of some kind.  In that case a relay and resistors could achieve the needed
   impedance matching.  After measuring the power required by the RING, 8-24V AC, what 
   it does when the button is pushed, and what the existing bell or chime needs to be 
   actuated.  A resistor network could be designed to match the resistance to supply 
   the power and actuate the preexisting bell or chime appropriately. 

§3) no preexisting doorbell
   A 50 W 25 Ohm resistor is used to duplicate the resistance of the legacy passive doorbell.
   Otherwise the RING, designed for use when an existing sound generator, could draw
   an unsafe amount of current.

Home Depot supplies a Hampton Bay 16VAC-30VA supply which needs 120Vac
1004 473 062   #HB-130-03  20ZN08   0 16963 04130 1
conforming to UL 5085-1,5085-3 & CSA C22,2 Bo, 66.1, 66.3

A 200 Ohm 2 W could supply 0.1 A and may be sufficient, however a
50W 25 Ohm resistor has been shown to work.
In a case where the doorbell had a resistance of 200 Ohm adding another 260 Ohms still allowed
enough charging current for the survailance camera to work. 
https://www.amazon.com/Cutequeen-Resistor-Aluminum-Wirewound-Chassis/dp/B06XQWJ4JP  $5/2
  TiToeKi,YiePhiot,RilexAwhile,RUSFOL,LAMNU, 
  https://www.mouser.com/ProductDetail/Vishay-Dale/RH05025R00FE02  $4.73
https://shop.ring.com/products/wirewound-resistor  [?,hp 50W25RJ 202002180085] $10


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There may be 24V transformers for the thermostat, air conditioner or other things.
In the case where one does not have access to the wiring in the house, one
may have to determine which of the cases [1,2,3] apply.  If one applies a resistance,
25 Ohm to 250 Ohm would probably be safe, the resistance of the doorbell mechanism
could be calculated.



Vt total voltage with no load, open circuit voltage
Vm measured voltage with load Rt
Rt test resistance
Rb bell solenoid resistance

Vt = (Rb + Rt)I  
I  = Vt/(Rb+Rt)
Vm = Rt * I

Rb = Vt/I - Rt
Rb = Rt(Vt/Vm -1)

Once one knows the bell solenoid resistance it can be determined what resistance
is appropriate to make a total resistance of 25 Ohms to 200 Ohms.


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ref:
https://store.ring.com/products/wirewound-resistor
https://www.walmart.com/ip/50W-25-Ohm-Aluminium-Housing-Chassis-Mount-Wirewound-Power-Resistor-Green-1pcs/963347901

https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code-5-band
http://www.learningaboutelectronics.com/Calculators/
http://aetechron.com/Ohms_Law_Home.shtml
https://www.teaching.eng.ed.ac.uk/open-educational-resources/basics-electronics/ohms-law-and-peak-vs-root-mean-square-rms-signals-ac
https://hamstudy.org/browse/E3_2011/G5B
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/acohml.html
https://www.engineeringtoolbox.com/

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https://homeguides.sfgate.com/troubleshooting-doorbell-doesnt-work-36512.html
  Troubleshooting a Doorbell That Doesn't Work
  resistance between 50 and 200 ohms 

https://www.cnet.com/products/ring-solar-panel-2-watt-8asps7ben0/
  Output Voltage 6 V  Max Electric Current 0.3 A  Power Capacity 2 Watt
https://uk.renogy.com/5-watt-solar-panel-charger-for-ring-spotlight-cam/
  5 Watt Solar Panel
https://www.homedepot.com/p/Ring-Solar-Panel-for-Spotlight-Cam-Battery-and-Stick-Up-Cam-White-8ASPS7-WEN0/
  304931842included micro-USB cord
https://www.zdnet.com/product/ring-stick-up-cam-battery/
  $49 Solar Panel to keep the Stick Up Cam Battery charged

https://websolarguide.com/am-solar-panel-reviews/

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fire hazard:
  Amazon's Ring video doorbells catch fire because wrong screw used
    https://www.bbc.com/news/technology-54903754
  https://www.cpsc.gov/Recalls/2018/amazon-recalls-portable-power-banks-due-to-fire-and-chemical-burn-hazards-recall-alert
  https://cpsc.gov/Recalls/2019/amazon-recalls-amazonbasics-ceramic-space-heaters-due-to-fire-and-burn-hazards-recall