Looking for Outdoor PIR Sensor to work with esp8266

Hardware
1

Hey All,
I'm looking for an outdoor PIR sensor something like this one.
Outdoor PIR Sensor

But this is rated at 12v and the esp8266 requires a 3.3v signal. Where can I find this kind of hardware?

Thanks
Rich

2

Would an optoisolator like this help?

1 Like
3

hmm, would probably work but not my first choice.

Maybe I should consider a sonoff device or something like that.

4

I used this item in my Outdoor PIR Sensor project... Honeywell - IS312B Passive Infrared Motion Sensor.
It has a "voltage free" contact which means you can arrange a simple switch-circuit to the ESP8266.

http://resources-area.co.uk/node-red-flows/it_grew_and_grew.pdf

Also used a DC-to-DC Buck converter MT3608, to convert 3v3 to 12V to power the IR Sensor.
https://www.aliexpress.com/item/4001066566291.html

This is what the PCB looks like I designed for the project.

a_IR_PCB
a_IR_PCB783Ă—649 70.6 KB

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5

Very cool! Love the documentation!

As for my own project... I just did some research on Sonoff PIR sensors and learned they use Zigbee radios. I played with Zigbee many years ago and never got far with it. But seems to be a standard these days. I like that they can help reduce traffic on your wifi and get longer distance. This sounds like a good path as my project grows in devices and complexity.

I'm back on the Zigbee learning curve. LOL

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I use the sonoff Zigbee motion sensors and they work well, indoors at least. I am going to try one outdoors, but under cover so it does not get rain on it. It will be interesting to see if it survives. It will be above a door, sheltered by the fact that the door is recessed into the wall about 200cm.

I use a Sonoff USB dongle V3 installed on a Pi, with Zigbee2MQTT to get the data into MQTT. The data can then be picked up using standard MQTT nodes in node-red. Don't bother with the zigbee2MQTT nodes.

Don't go for a cheap USB dongle, some are rubbish. If you go for the Sonoff make sure it is V3 (or perhaps there is a later one, I don't know).

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You're reading my mind and answering questions before I ask them! As for the dongle, does it need to be on a machine or can it just be powered by a charging port?

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It needs to be in a machine. I believe there are alternatives, such as WiFi gateways, but I have no experience with them.

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