Contact Sensor 3 - an ESP8266 Door & Window Sensor

[@gadjetsvideo]

A tip that I use for programming is to edit the footprint of the connector to slightly offset the pads a small amount alternating left and right so that the programming pins are a friction fit and have a good contact.

[@MrDIYca]

I will give it a try - thanks for the tip!

[@PhG1961]

Excellent video ! Great work !

[@LEARNER4LIFE1]

i notice it have to be placed outside of the door, possible to place inside of the opening so its more secure.

[@NiLuBu]

Very exciting project! 👍 Is there a BMS to protect the battery from undervoltage?

[@MrDIYca]

I use protected lipo batteries with BMS built-in for my sensors. The charge controller also has a UVLO. But in theory, if you leave a low battery connected, the ATtiny might drain is ever further over a very long period of time (years).

[@1_HighDuke]

Awesome! Thank you for sharing with us.

[@MrDIYca]

Sure thing!

[@朱志华-d3i]

Thanks for sharing ，can I remove the Attiny and directly switch_input to the EN pin of the ldo, so that it is more energy efficient without the Attiny if Switch_input is a self-reset button ? My project is to use the self-reset button to remotely control the light through espnow

[@koloksimonasen872]

hello my friend! what software did you use to calculate your battery life over time and graph it like that? :)

[@MrDIYca]

I reviewed it here - kzbin.info/www/bejne/p6upmGiZYqdkl9U

[@tlar1272]

Cool gadget. Does it come with instructions to pair it with home automation? I saw a large battery pack, a coin cell, and a mention of a battery charger circuit. So what is it typical power source?

[@MrDIYca]

Thanks. It depends on the home automation system. For Home Assistant, you can use this www.home-assistant.io/integrations/sensor.mqtt. For NodeRed, you can use the MQTT node to trigger events. For version 3, any lipo battery will do, as long as it has a PH2.0 plug ( and the right wire polarity)

[@Mr_ToR]

very nice. would this also work with esphome? I already have home assistant and many esphome devices. so I naturally don't need a hub.

[@MrDIYca]

I am working on a new video to show how to use your own code bypassing the hub. If you can code it, I don't see why it wouldn't work.

[@jacklewis100]

Wish it had LoRa so that range was bigger/more reliable for a larger home/garden.

[@varunkumaran2624]

Hiii... Your Project is Really good and I am trying to replicate the same... I Have tried the version 3 code for attiny and while deep sleep I am getting a 350 micro amps.. I even tried version 2S of attiny code which gives me a deep sleep current of 26 micro amps... The deep sleep current i mentioned above are attiny alone... May I know what board manager you are using for attiny( I am using Micro dude)... And how much current you get attiny alone while deep sleep??...

[@MichaelParment]

Is it not a problem to send 4.2v (fully charged battery) to GPIO (SWITCH_INPUT)?

[@MrDIYca]

In theory, it may, but based on my research and practical experience of using it on multiple doors/windows for years, it has proven to be a non-issue. Additionally, only a negligible amount of current leaks (high impedance) into the pin, and this occurs for a very brief duration.

[@vishaltejwani940]

had an idea , how do I reach you to discuss it for a better motion sensorsystem?

[@MrDIYca]

here is good.

[@WillYork]

Would you have any idea at what temperatures these are rated at? I have a shop outside and wanted to put some sensors on the doors. Last month it got down to -35F (-37C) without wind. THey would be out of the wind. The hub would be in a heated area so not worried about that. Thanks!

[@MrDIYca]

-37C is a bit extreme, we only see it once or twice a year here, even my car struggles to start. But it is good question. I will have to go back and check the datasheet for all the components. For now, I will leave one in the freezer and see what happens.

[@WillYork]

@@MrDIYca it's not common but it does happen every year. Last year we hit that mark for almost a month, it was pretty crazy

[@blkhackr]

@@WillYork could the contact sensor be mounted inside, say at the top of the door. maybe with a small part sticking out to trigger the switch

[@WillYork]

@@blkhackr so it's a heated office inside an unheated steel building. Ideally I want a sensor on each door. I have shop equipment in the unheated part and electronics in the heated part so I'd want to monitor both.