ID fake DS18B20 directly from the "esphome-pressure" board?

[drew-hill]

I tried to ask some questions via Tindie, but kept receiving an error. My apologies in advance, as these aren't really "issues", but I'd love your thoughts! (Alternatively, maybe a GitHub Discussion group could house future questions like these?)

Q1: I really appreciate the information you've provided on counterfeit DS18B20 sensors. I've unfortunately been unable to stack a few of my own sensors and would love to confirm whether they're counterfeit via the ROM-based method to which you link, but I don't (think I) have the appropriate hardware. Are you aware of any way to tell using ESPHome output in the logs or maybe flashing the ESP32 board that you sell on Tindie with some specific firmware?

Q2: Do you happen to know if the boards you sell on Tindie are lead free (lead free solder, components, etc)?

Thank you!

[drew-hill]

Huh. I couldn't for the life of me find this discussion area. Thanks for converting this!

[gcormier]

Hello! Unfortunately I don't know much about detecting the counterfeits. I've been using legit sensors from Digikey so I haven't run in to any issues.

As for the PCB's, yes they are lead free.

[drew-hill]

Hello! Unfortunately I don't know much about detecting the counterfeits. I've been using legit sensors from Digikey so I haven't run in to any issues.

As for the PCB's, yes they are lead free.

Makes sense re: counterfeits.

To stack the sensors, do you just add multiple DS sensor entries in the yaml? Maybe I'm just doing that wrong. Is there an example on GitHub that maybe I've missed that you could kindly point me to?

Appreciate the bit about lead-free PCB as well. Thanks!

[gcormier]

Yeah you just stack them.

sensor:
  - platform: dallas
    address: 0x0000000e9d000928
    name: "0928"
  - platform: dallas
    address: 0x8100000e9cdf4428
    name: "4428"

[gcormier]

But to find out each ID, it's a 1 by one process querying the bus. Or you query the bus, get all the ID's, and then I guess heat up each one to see which ID corresponds to which actual sensor. If you query the bus with multiple sensors does it find them all?

[drew-hill]

It does! Odd. I'm going to get some real ones off of DigiKey anyhow. Might as well.

Another question for ya: do you happen to know if air circulates all the way through the pressure sensor from one port through to the other? Or is no air actually leaving / entering the ducting through the tubing that id connect to the pressure ports?

[gcormier]

Air doesn't circulate, each port is sealed from one another. The sensor measures the deflection of a membrane that divides two chambers. Hence why the sensor can be damaged if you apply too much pressure, it'll deform or otherwise damage the membrane.

[drew-hill]

So cool. Thanks!