Hi,
does anyone know good store to buy online Ds18b20? I have bought two lots of 5pcs. from Aliexpress and they all died in couple of days. No matter how them connect, they all stopped working after few days.
I buy all of mine from Ali. The only failure has been through mishandling on my part. I did have a screw-in that failed completely, but I bought that one from Mouser.
How exactly are you connecting them?
Never had an issue with any of mine, some bought from Ali some off eBay, no doubt all the same source in reality. Some have been in use for 4 years now
Tried two ways : + signal - and parasite + and - bond together. One lot work ok in parasite and regular connection but I wasn’t able to change resolution on none from that lot. Other lot can’t work in parasite conection but I was able to change resolution. All of them worked for few days or weeks and than died. That happened on two boards, one esp32 and one esp8266. All ds was powered from 3.3V onboard regulator and have 4.7k resistor and in case of regular power, 10uf capacitator.
I have ds18b20 which work also for a long time but those I bought in last few month from Aliexpress are bad. I have bought them from two different sellers and there was a different price for them.
I’ve only ever bought the waterproof ones from Aliexpress (https://www.aliexpress.com/item/32676135779.html) and have never run them in parasitic mode. No failures.
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Are mostly fake/clone and the quality of them can greatly vary.
What is fake? Maxim Integrated makes the DS18b20 chip and hundreds of companies put it in various packages and products. If Honeywell buys a million chips for their home thermostats and they only use 900,000, the leftovers are sold to an overstock middleman who puts them into poly bags and sells them on EBay or Ali Express. So, where does this accusation of “Chinese fakes” come from?
That’s news to me. Thanks.
I would have thought that the market demand for the DS chips was small enough to be of no interest to the clone fabricators.