Well there are different boards around.
1st. I see CH340 USB chipset on these photos. (Can’t find the source) but I read that this one are fakes/not official and have different layout like mention before. There are some with a CP210X around, as well, but mostly with same size, layout and pinout (Can’t prove if I’m right/wrong).
2nd. If you want to buy the ESP32, inside of the official Datasheet there are already 6 different boards mentioned. Some with single core instead of dual core. However, they are even with 34 to 40 pinout if you buy something like Node MCU, Wroom, ect.
3rd. Almost every company/producer do updates on they boards. (Especially boards for Arduino). Sometimes they write “Rev. X” or similar.
As you can see, there are many kinds of layout around which can do the same things but with one or two different. Most of the user here won’t even notice this until they need something which isn’t available.
Aparna Sathya Murthy Thanks,
As far as I understand for the blog post. After reading your 3 mentions "Blog Post" I should follow Agile for beginning the project.
As about minor differences (different USB interface chips, variants in the passive components):
you have to understand that ESP32 something boards from different sources shall behave identical, but need no be identical in the physical way. These are "closes", not "copies"!
Your other complaint about different pinouts and ESP variants: oh yes, there's a number of variants available
- Single core vs. dual core - but both are ESP32 modules from Espressif. Just a question of performance vs. price.
- Board variants Wroom, Wrover and some more. I think this is basically driven by the intention to keep the PCB outline somewhat "acceptable": the Espressif module has got more pins than you would like to attach (to keep the board small). Thus variants for differing user groups are available as variants.
Anyway: while these PCBs will not be identical, they are sufficiently similar: if you know one, it will be easy to use another variant.
U. Dreher likes Smartphones, TVs, vacuum cleaner and more... But there is one big difference: Big company invests more money in producing products with better quality and in the bigger count.
The best example, Smartphone CPU: There are 6-7 factories in the world who can delivery so many and working CPU in a small-time, unlike other small factories. I know, there are some who can deliver the same amount of this CPU as well, but how many are working properly?
That is one reason why “Made in China” doesn’t equal “Made in China”, but it’s a good reason against Alibaba. They don’t care about this until they don’t sell enough. Most of them don’t have any knowledge and do copy&past from the internet and some people are confused about why it’s not working.
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