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those are the various hardware versions of ESP8266; there are about 10 now and more are being released quickly so that number is probably larger than 10 already by the time you read this:
the cheapest 3.3v PSU is this: rip off an old beat up power supply from some crappy computer; cut the main connector and you have 3.3v 10 Amps plus the bonus of all the other voltages: 12v 5v and -12v
An RS232 cable WILL NOT DO. You need a ttl level cable with the ttl being 3.3v
In addition to that you need to power the module with 3.3v; if you don't have a bench supply then you need a 3.3v buck converter (dc to dc) or a 3.3v regulator such as the AP1509; it's only few cents...
The AT commands depend on the firmware; they seem to change almost daily as new commands are added; I found the following BEGINNER’S GUIDE helpful when I first started playing with the module
Make one up with 2 transistors or go the fancy way and order a level shifter; the transistor way worked for me years ago and it's still my handy dandy choice for these things:
I'm not familiar with nRF24L01 but with ESP it is most defenietly possible to control things behind it using simple NetCat such as echo "0xEA" | nc 192.168.1.55 333 -w 3
The ESP can act as a simple Ethernet to serial bridge so all your MCU needs to do is listen for strings and take action; in...
come on man you need a real FTDI cable or an older Prolific serial to TTL cable; each is only few bucks. The whole business with zener diode and resistors would likely fry the ESP. I got these FTDI cables with a little switch to change the TTL levels between 5v and 3.3v;
I fully expected fake...
Finally sells at Newark for $69; may be not a cup of tea for those with blank "location profile field" on the forum but at least finally this is available on the Internet:
https://www.newark.com/simcom/sim300evb/evaluation-board-gsm-gprs-tri-band/dp/50P8629
Manufacturer:SIMCOM
Newark Part...
They don't list such small parts on the web site, I think your best bet would be to e-mail me and I could give you the part #
This place is like a huge warehouse with thousands of bins full of parts. You can spend hours looking for small stuff and some times you find what you are looking for...
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