Random mini project from yesterday. I posted before about the outdoor temp sensor for my wireless thermometer, and how corroded it was. Something was wrong with the battery holder in the case, so I just pulled the metal bits out and soldered wires on, which I ran outside the case. So I got it back together but it still needed power.

I hooked it up to a couple AA nick metal hydride batteries, which of course are a little lower in voltage than alkaline primary cells (1.2 V for NiMH vs 1.5 V). The rechargeables work fine when charged, but the voltage dips down soon especially in cold weather. The transmitter seems to work okay down to around 2.6 V.

I took a solar panel from an old string of solar lights (water had gotten in and corroded the other guts), and hooked it in parallel, so I get some charging too. It's just connected with a diode, and should put out a few 10s of mA, which should be more than enough to compensate for the transmitter, which briefly draws about 7 mA for a second, every 30 seconds or so. I guess some kind of regulator would be good to avoid overcharging, but I'm going to try winging it.

I put it outside, and it seemed to survive another cold night. I put a meter across the battery today, when it's been around 20 degrees F and sunny, and saw the voltage was just under 3 V, which is good. I should find a slightly more permanent way to mount/shelter this, but for now the plastic container should work.

#solar #TemperatureSensor #electronics

That temperature sensor on Google’s Pixel 8 Pro finally has a use

The Pixel 8 Pro is the first phone from Google to include a infrared temperature sensor embedded in the camera bar on the back of the phone. But when Google launched the phone in October the company didn’t really provide much of an explanation of what you were supposed to use it for.
Now we know: in addition to measuring the temperature of […]

https://liliputing.com/?p=166222

#google #pixel8Pro #smartphones #temperatureSensor

Aqara Temperature and Humidity Sensor installed into thermally insulated doghouse.

Looks like dogs already attempted to eat it.

The sensor works reliably so far. Zigbee connection is stable. HA plots nice graph.

#aqara #homeassistant #temperaturesensor #zigbee

@[email protected]
@homeassistant
@zigbee

SHT41 is not too hot, not to cold - just right! 🌡️👌🔄🔗📚🐻🐻🐻👧

the SHT41 sits right between the SHT40 https://www.adafruit.com/product/4885 and the SHT45 https://www.adafruit.com/product/5665 with the same typical +-1.8% humidity accuracy as the SHT40 but better guaranteed performance at the edges of functionality: +-2.5% instead of 3.5%. Given its the same footprint as the SHT40 it's an easy respin, so here ya go

#SHT41 #JustRight #TemperatureSensor #HumidityAccuracy #Adafruit #Electronics #EasyReSpin NotTooHot #NotTooCold

It looks like the Pixel 8 Pro could have a temperature sensor when it launches later this fall, according to a leaked demo video that shows how it can be used to detect fevers when waved over your forehead. https://www.91mobiles.com/hub/exclusive-google-pixel-8-pro-leaked-video-design-built-in-thermometer/

#Pixel8Pro #Pixel #leaks #TemperatureSensor #Smartphones

I'm very pleased how well the #Dreame #robot vacuum cleaner works with #Valetudo after I have liberated it from the Xiaomi cloud. Even the integration with #Domoticz seems to be on a good way 🥰

So now I'm starting to look for an #AirPurifier, a #TemperatureSensor and a #HumiditySensor as well as valves for the #UnderFloorHeating that I can add and control without the respective proprietary cloud services 🤓

Any #recommendations? Ideally for fairly recent hardware? 🙄
#AskFedi
#BoostAppreciated

Remote MQTT Temperature Sensor Shows How It’s Done

First of all, there are definitely simpler ways to monitor remote temperatures, but [Mike]'s remote MQTT temperature sensor and display project is useful in a few ways. Not only does it lay out how to roll such a system from scratch, but it also showcases system features like solar power.

After all, if one simply wants to monitor temperature that's easily done, but once one wishes to log those temperatures and use them to trigger other things, then rolling one's own solution starts to get more attractive. That's where using someone else's project as a design reference can come in handy.

[Mike's] solution uses two Wemos D1 boards: one with a DS18B20 temperature sensor for outdoors, and one with a small OLED screen for an interior display. The external sensor relies on a rechargeable 18650 cell and a solar panel for a hassle-free power supply, and the internal sensor (of which there can be many) has a cute enclosure and is powered by USB. On the back end, a Raspberry Pi running an MQTT gateway and Node Red takes care of the operational side of things. The whole system has been happily running for over two years.

What is MQTT? It is essentially a messaging protocol, and takes care of the whole business of reliably communicating data back and forth between IoT devices. It scales very well and doesn't need to be hard or intimidating; our own [Elliot Williams] can tell you all about implementing it.

#howto #microcontrollers #diy #iot #mqtt #nodered #temperaturesensor #wemosd1