Is it OK?

https://www.virustotal.com/#/file/6082b86e6a56783e692afaa7c6d79e5af0d6ca58476ef7e180a39594ce441cd7/detection

No such warnings/detections for .282 version.

You can try also Bosch BME280 - all in one sensor for temperature, humidity and pressure

Ikea is also producing zigbee-compatible smart home components (TRÅDFRI series), including led lighting, dimmers, PIRs, ethernet gateways without cloud-based parts (can work w/o internet).

Starting from $11-$19 for dimmers/PIRs here in Poland.

Seems like this is offtopic, but there are good meanwell power supplies designed to run 24x7, like this:

http://www.meanwell.com/webapp/product/search.aspx?prod=DR-15 (MTBF 1.1M hours)

Or even something like this:
http://www.meanwell.com/webapp/product/search.aspx?prod=PM-05 (MTBF 1.5M hours) and so on

I used long time this NFM-05-5 power supplies, very good, no problems at all:
http://www.meanwell.com/webapp/product/search.aspx?prod=NFM-05

@NeverDie you can just google for images for "exploded/burned phone charger"

Just an example:

If safety is on the first place you can make your own power supply using miniature transformers like this (lower half of PCB):

Such transformers are very small for low-power nodes:

UPD: link to the topic: https://forum.mysensors.org/topic/6259/encapsulated-transformers-instead-of-traditional-switching-power-supplies-like-hi-link

Good ruler, I have such ruler too

Today's power part of my RGBW dimmer node (four LED channel PWM inputs, 12V input, +12V sense, +5V, +3.3V outputs). Dimmer is controlled by MySensors and also by conventional Samsung TV remote control (five presets, ability to record color presets, autofade from one preset to another, control of each LED channel brightness, gamma correction and so on).

Try to call Serial.flush(); after each print line, this ensures that all data sent to serial port before next line executed.
Can you post image with connection wires to DS18B20 sensor? Could the problem be that this chip is a fake?

Power (lower half) and external interfaces (upper half) PCB for my "entrance" MySensors node (unregulated voltage, +5V, +3.3V, doorbell detector, electronic door lock status, temperature, etc). I'm using conventional 220V=>6V transformers as main power supply and as simple 220V presence detector for doorbell.