ESP-07 (or ESP-12) with NodeMCU going into deep sleep

Made by Bobby
Published in Everything ESP

About this project

Sample project how to set up ESP-07 (or ESP-12) with NodeMCU going into deep sleep

Project info

Type

Protip

Difficulty

Easy

Published

December 10, 2015

10,040
5

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Things used in this project

Hardware components:

USB to TTL FT232

Everything ESP ESP-07

Software apps and online services:

NodeMCU Firmware programmer

NodeMCU firmware

Esplorer

Story

This is to show you how to get started with a ESP8266, model ESP-07 (flashing firmware, writing code) and test deep sleep mode.

The first thing to do is to wire your ESP to power (VCC), ground, RX/TX of PC Serial and the required GPIOs:

+3.3 volts to Vcc
ground
TxD on the board to RxD on the adapter
RxD on the board to TxD on the adapter

DONT USE 5V as this will damage your ESP.

Connect Vcc to CH_PD to enable the chip
Connect GPI0 to GND to enable flash reprogramming
Connect GPI15 to GND to enable UART Download

Once wiring set up for flashing, you can flash your ESP with latest firmware. Download and run NodeMCU Firmware programmer ((ESP8266Flasher.exe)..

Select your COM port (usually is auto-detected, check the drop-down list)

On Advanced tab, you should have those values:

Baudrate: 57600

Flash size: 4MByte

Flash Speed: 40MHz

SPI Mode: DIO

Power up your ESP and press Flash(F) button.

If everything goes well, the MAC is being read and a progress bar will show you the flashing status.

Once completed, you can power it off and close the application.

Now let's change it to boot mode.

Connect Vcc to CH_PD to enable the chip
Disconnect GPI0 from GND tand connect it to Vcc

Now we have a flashed ESP, with NodeMCU firmware and ready to boot.

Download and run Esplorer application (Esplorer.bat - is running a jar file).

Set up the correct COM port and press Open.

Power the ESP. If everything is ok, the output from your ESP is displayed in the right side, loading NodeMCU firmware and ready for coding.

NodeMCU 0.9.6 build 20150704 powered by Lua 5.1.4

lua: cannot open init.lua

>

Open the two scripts: init.lua and sleep.lua and press button Save to ESP on each one.

Or, you can use Upload button (this will avoid to run in after upload).

Note: dont forget to add your wifi ssid name and password in init.lua file.

Power off/on your device and you'll see in serial console the output of your code:

connect to Wifi
execute sleep.lua
open a web connection to google.com
parse the result and get the date/time
enter to deepsleep for 60 seconds

Once 60s is over, the ESP will reset and start over.

Note:

If you want to break this loop and re-write the code, use this tweak:

in Esplorer go to tab Snippets
edit one of the Snippets and add this code:

file.remove('init.old')

file.rename('init.lua','init.old')

save it and you'll have a new button associated to this code.
when ESP is starting and header is displayed (NodeMCU 0.9.6 build 20150704 powered by Lua 5.1.4) press immediately the button.

This will remove the init.lua and the ESP will stop, ready to be coded, as we started in the beginning.

Good luck!

If something is unclear or get stuck, you can comment it and I will reply and update the steps above.

ESP-07 Pinout

Download

ESP8266 GPIO list and NodeMCU index

Download

Code

sleep.luaLua

-- retrieve the current time from Google
print("Check the time...")
conn=net.createConnection(net.TCP, 0) 

conn:on("connection",function(conn, payload)
            conn:send("HEAD / HTTP/1.1\r\n".. 
                      "Host: google.com\r\n"..
                      "Accept: */*\r\n"..
                      "User-Agent: Mozilla/4.0 (compatible; esp8266 Lua;)"..
                      "\r\n\r\n") 
            end)
            
conn:on("receive", function(conn, payload)
    print('Retrieved in '..((tmr.now()-t)/1000)..' milliseconds.')
    print('Google says it is '..string.sub(payload,string.find(payload,"Date: ")
           +6,string.find(payload,"Date: ")+35))
           print("Going to sleep...gone in 60s")
    -- enable deepsleep for 60 s (60 x 1000 x 1000)
    node.dsleep(60000000)
    conn:close()
    end) 
t = tmr.now()    
conn:connect(80,'google.com')

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Comments

Slarti Fartfast

6 months ago

Good idea for a project, as I want to implement a sleep function, and great documentation, .

One thing that I can't quite see; you say the ESP will reset after sleep, but I don't see any call to node.restart() so what does that? surely dsleep doesnt reset, or we would lose variables, etc. sorry if that seems dumb!

Bobby

5 months ago

That's how actually Deep Sleep works. This state triggers the Reset pin when timer expires.
Yes, you will need loose variables if not stored, the algorithm just starts again.

If you want to save variables, just save it on a file (write/read).

Anudeep

5 months ago

Hi.. I tried same code with Esp8266-01 after displaying date and time it's going to deepsleep and but it's not restarting.....?

Bobby

5 months ago

That's because ESP01 does not have (exposed) this GPIO16 - Deep Sleep to connect it to reset pin, in order to be triggered.
So, use ESP07 or 12 or similar.

Deleted account

3 months ago

I have a big problem with the ESP-12
I plug according to the diagram at 3.3v:
+3.3 Volts to Vcc
ground to ground
TxD on the board to RxD on the adapter (PL2303)
RxD on the board to TXD on the adapter (PL2303)
Vcc is CH_PD
GPI0 is GND
GPI15 is GND
And with Flash does not have a problem (Loading a just - nodemcu_float_0.9.6-dev_20150704.bin)
The problem appears in ESPlorer - I can not open a port and connect to upload any code 😦
It performs steps in sequence to power off the ESP-12
Connect Vcc is CH_PD (even though it was still connected in this way)
Disconnect GPI0 from GND and connect it to Vcc
(Or the GPI15 I did not do anything? And continue to be connected to the ground?)
PL2303 plug in a USB powering at this moment the ESP-12. In ESPlorer i want to open but nothing happens, and only rows of dots to display ...
What I am doing wrong and how to make the opening of the port with my ESP-12?? 😦