Hi all,
i am trying to make the arduino uno capture images which would be taken by a ov7670 camera, stored in the sd module and finally transmitted via esp-8266-01. (yeah i know it is really too much ask from uno).
I am able to complete the testing of the camera and wifi on the arduino by now (sd card module can also be completed soon).
Now i would like to integrate the doorbell to act as switch that lets the camera know that it should take the photo followed by the wifi to transmit data(switch on the wifi module). I am aware that the ringer door bell could be working at higher voltage(could be AC), so i cannot connect the switch of the bell to the arduino uno pins (which would kill the uno).
SO , what can I do signal the arduino from the door bell(switch) without killing my Uno and chipsets.
I am preferably looking forward to the electronic components/hardwares and wiring connections which are involved to connect the doorbell and the Uno.
Thanks in advance.Any help would be really appreciate.
Hi Shariq
You need to find out exactly what voltage the doorbell switches. Measure it. If it is less than 5V, simply use that voltage on one of your Arduino input pins, if it is more than 5V, use a voltage divider/reducer circuit to bring the level to below 5V, and then use that on your input pin.
Be sure there is no high current spike - which will likely fry your Arduino.
hi theMusicMan,
thank you for your quick response and
kind suggestion.
i would certainly.but Again if its 5 V( i
don't think it would be) AC it can reach
upto 7.2V. risky enough.
i was wondering if i could make a
constant dc voltage (pulse wave) for it.
Ahhh, are you saying your doorbell is AC supplied? That surprises me...!
Yes, if it is AC, 70V is more than enough to give you a nastt shock, so take care. Personally, I'd be looking for a new doorbell, one that works off a battery!
I am sure there's something out there, but in all honesty, I have not heard of any off the shelf 'detector' for 70V AC. If it is 70 V AC, AND you don't plan on getting a new doorbell that works off a lower DC supply, then I'd also ask in an electronics forum too.
Good luck!
John
Have you searched the Arduino forums for "doorbell". There are several forum threads that relate to your exact question.
Paul
it's been a long time since I worked with the doorbell, but here in the United States, I believe they use either 18 or 24 V AC. Only battery-operated doorbells work off of DC. And they use a radio transmitter. If you're using a battery-operated doorbell, you may be able to determine the radio frequency/code and trigger the Arduino using a receiver. or have the doorbell button directly connected to the Arduino, and have the Arduino trigger the doorbell. there are several ways you can do this, you just need to figure out which is best for you.
promacjoe2:
it's been a long time since I worked with the doorbell, but here in the United States, I believe they use either 18 or 24 V AC. Only battery-operated doorbells work off of DC. And they use a radio transmitter. If you're using a battery-operated doorbell, you may be able to determine the radio frequency/code and trigger the Arduino using a receiver. or have the doorbell button directly connected to the Arduino, and have the Arduino trigger the doorbell. there are several ways you can do this, you just need to figure out which is best for you.
And then there are mechanical door bells. Our 1980 Mfg home had one. Our ex-daughter-in-law's very old home still has one. I took our mechanical one out and replaced it with a battery/rf type door bell.
By the rf type door bell won't work if your home has aluminum siding unless the bell can see the ringer part through a window.
Paul