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- ESP 8266-01 module
- Using Esp01 programmer adapter
This is the best way for flashing the esp01 buy this module and get free from messy wires in future .
Its very handy and very quick .
Note:The module do not enter the programming board directly .For this you need to solder the jumper on it .Please refer the photo for this .The jumper is solder between gpio 0 and gnd pin.when not using in programming mode shift the jumper to the empty pin.
- Using BreadBoard Power module
With this module you can separately give 5v to arduino and 3.3 v to esp8266 at the same time .This is the beauty of this module .
Esp rx pin also need 3.3v .If you try to put arduino tx to esp rx .The esp module can get damage .To prevent this from happening you can do two things .
- Use Voltage divider
1. Voltage divider
use 20k and 10k resistor to achive this . Please check the connection in photo
vcc & chpd of esp is connected to 3.3v
Gpio 0 & gnd of esp is conencted to gnd
Rx of esp is connected TX arduino directly
Tx of esp is connected to arduino rx via voltage divider
2. Level shifter
Please check the connection in photo
- connect 5v of breadboard power supply to hv pin of logic level
- connect 3.3v of breadboard power supply to Lv pin of logic level
- connect tx of arduino to any other hv pins out of 4 pins ,corresponding to the pin you have connected tx ,connect rx of esp to that which will be Lv pin
2. Esp 8266-12 module
I found daflabs instructables best for this module so far
I used Arduino instead of cp2102 module, and I had no issue in communication.
The connection will remain mostly same for esp8266-12 to run it in flash mode.
GPIO0 -> LOW
GPIO2 -> HIGH
GPIO15 -> LOW